MAX1602EEE+;MAX1602EEE+T;中文规格书,Datasheet资料

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1602字符模块使用手册

字符模块使用手册目录1.概述 . . . . . . . . . . . . . . . . . . . . . . . . . 第 1 页2.字符型模块的特点 . . . . . . . . . . . . . . . . . . . 第 1 页3.基本原理 . . . . . . . . . . . . . . . . . . . . . . . 第1-3页4.技术参数 . . . . . . . . . . . . . . . . . . . . . . . 第 4 页5.时序特性 . . . . . . . . . . . . . . . . . . . . . . . 第4-5页6.引脚和指令功能 . . . . . . . . . . . . . . . . . . . . 第6-10页7.使用举例 . . . . . . . . . . . . . . . . . . . . . . . 第11-20页1.概述人们对液晶显示器并不陌生,最常见的有如计算器、电子表、数字万用表、电子游戏机等,显示的主要是数字、专用符号和固定图形,因为是属段式显示,显示内容就无法多变。

随着大量电子仪器、设备的智能化,并且普遍地采用人机交互方式,需要能够显示更为丰富的信息和通用性较强的显示器,而点阵式LCD显示器能够满足这些要求,同时用大规模专用集成电路作为点阵LCD控制驱动,使用者仅仅直接送入数据和指令可实现所需的显示。

这种由LCD 板、PCB 板、控制驱动电路组成的单元叫做点阵液晶显示模块( DOT MATRIC LCD MODULE )。

深圳市瑞特电子有限公司是液晶显示器专业生产厂家，以其雄厚的力量，先进的生产设备及工艺，已开发生产出一系列的LCD 点正阵模块（字符型和图形型）。

本手册着重介绍字符型模块的使用方法。

2.字符型模块的性能重量轻:≤100g;体积小:≤11mm厚;功耗低:10 - 15 mw;显示内容:192种字符(5×7点字型);深圳市瑞特电子有限公司字符模块使用手册1接口方面,有8条数据线,三条控制线。

1602C使用说明书

TJDM/DM1602C 字符型液晶显示器规格书
一.概述
TJDM/DM1602C 是一种字符型液晶显示器。可显示 32 个 5x8 点阵的字符，每个字符是由组成的字符块集。它主要采用动态驱动原理由行驱动—控制器和列驱动器两部分组成了 80(列)×16(行)的全点阵液晶显示。此显示器采用了 COB 的软封装方式，通过导电橡胶和压框连接 LCD，连接可靠,使其寿命长。
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2)归 HOME 位（02H）
格式
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0
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1
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将 AC 清零。将光标或闪烁位返回到显示屏的左上第一字符位上，即 DDRAM 的 00H 单元；或撤消画面的滚动效果，将画面拉回到 HOME 位。
3)输入方式设置（04H～07H）
格式
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LCD1602中文最详细的解释

1602型LCD介绍
现在的字符型液晶模块已经是单片机应用设计中最常用的信息显示器件了。

1602型LCD显示模块具有体积小，功耗低，显示内容丰富等特点。

1602型LCD可以显示2行16个字符，有8位数据总线D0~D7和RS，R/W，EN三个控制端口，工作电压为5V，并且具有字符对比度调节和背光功能。

1. 外型尺寸：80X36X13（LXWXH）
2.接口信号说明
1602型LCD的接口信号说明如表1-11所示.
3.主要技术参数
1602型LCD的主要技术参数如下:
4．基本操作程序
读状态：输入：RS=L，RW=H，E=H 输出：D0~D7=状态字
读数据：输入：RS=H，RW=H，E=H 输出：无
写指令：输入：RS=L，RW=L，D0~D7=指令码，E=高脉冲输出：D0~D7=数据写数据：输入：RS=H，RW=L，D0~D7=数据，E=高脉冲输出：无
5．RAM地址映射图
控制器内部带有80字节的RAM缓冲区，对应关系如图11-3所示
6．状态字说明
☆注意每次对控制器进行读写操作之前，都必须进行读写检测，确保STA7为0。

7．数据指针设置
控制器内部设有一个数据地址指针，用户可以通过它们访问内部的全部80字的RAM。

8．其它设置
9.初始化设置
(1)显示模式设置
显示开/关及光标设置。

1602的中文资料

1602采用标准的16脚接口，其中:第1脚：VSS为地电源第2脚：VDD接5V正电源第3脚：V0为液晶显示器对比度调整端，接正电源时对比度最弱，接地电源时对比度最高，对比度过高时会产生“鬼影”，使用时可以通过一个10K的电位器调整对比度第4脚：RS为寄存器选择，高电平时选择数据寄存器、低电平时选择指令寄存器。

第5脚：RW为读写信号线，高电平时进行读操作，低电平时进行写操作。

当RS和RW共同为低电平时可以写入指令或者显示地址，当RS为低电平RW为高电平时可以读忙信号，当RS为高电平RW为低电平时可以写入数据。

第6脚：E端为使能端，当E端由高电平跳变成低电平时，液晶模块执行命令。

第7～14脚：D0～D7为8位双向数据线。

第15～16脚：空脚1602液晶模块内部的字符发生存储器（CGROM)已经存储了160个不同的点阵字符图形，如表1所示，这些字符有：阿拉伯数字、英文字母的大小写、常用的符号、和日文假名等，每一个字符都有一个固定的代码，比如大写的英文字母“A”的代码是01000001B（41H），显示时模块把地址41H中的点阵字符图形显示出来，我们就能看到字母“A”1602液晶模块内部的控制器共有11条控制指令，如表2所示，它的读写操作、屏幕和光标的操作都是通过指令编程来实现的。

（说明：1为高电平、0为低电平）指令1：清显示，指令码01H,光标复位到地址00H位置指令2：光标复位，光标返回到地址00H指令3：光标和显示模式设置 I/D：光标移动方向，高电平右移，低电平左移 S:屏幕上所有文字是否左移或者右移。

高电平表示有效，低电平则无效指令4：显示开关控制。

D：控制整体显示的开与关，高电平表示开显示，低电平表示关显示 C：控制光标的开与关，高电平表示有光标，低电平表示无光标 B：控制光标是否闪烁，高电平闪烁，低电平不闪烁指令5：光标或显示移位 S/C：高电平时移动显示的文字，低电平时移动光标指令6：功能设置命令 DL：高电平时为4位总线，低电平时为8位总线N：低电平时为单行显示，高电平时双行显示 F: 低电平时显示5x7的点阵字符，高电平时显示5x10的点阵字符指令7：字符发生器RAM地址设置指令8：DDRAM地址设置指令9：读忙信号和光标地址 BF：为忙标志位，高电平表示忙，此时模块不能接收命令或者数据，如果为低电平表示不忙。

LCD1602串并双口使用说明书

产品使用说明书1602A1字符型液晶显示模块（双接口&带串口）第 1 页，共 29 页目录一、概述--------------------------------------------------------------------------- 3二、主要参数--------------------------------------------------------------------- 3三、接口引脚说明--------------------------------------------------------------- 4四、时序说明--------------------------------------------------------------------- 51、写操作时序与时序图：(MCUàLCM)------------------------------------------ 52、读操作时序与时序图：(LCMàMCU)------------------------------------------ 5五、LCM内部结构-------------------------------------------------------------- 61、指令寄存器（IR）和数据寄存器（DR）-------------------------------------- 62、忙标志位BF ------------------------------------------------------------------------ 63、地址计数器（AC）----------------------------------------------------------------- 64、显示数据寄存器（DDRAM）---------------------------------------------------- 75、字符发生器ROM ------------------------------------------------------------------ 76、字符发生器RAM ------------------------------------------------------------------ 8六、指令说明-------------------------------------------------------------------111、Clear display (清显示)-------------------------------------------------------------112、Return home (归位)----------------------------------------------------------------113、Entry mode set (设置输入模式)-------------------------------------------------124、Display on/off control (显示开/关控制)----------------------------------------125、Cursor or display shift (游标或显示移位元)-----------------------------------126、Function set (功能设置)----------------------------------------------------------137、Set CGRAM address (CGRAM地址设置)-------------------------------------138、Set DDRAM address (DDRAM地址设置)-------------------------------------139、Read busy flag and address (读忙标志BF和AC)-----------------------------1410、Write data to CGRAM or DDRAM(写数据到CGRAM或DDRAM)---------------------------------------------1411、Read data from CGRAM or DDRAM(从CGRAM或DDRAM中读数据)------------------------------------------14七、应用举例--------------------------------------------------------------------151、硬件方面电路----------------------------------------------------------------------152、软件举例----------------------------------------------------------------------------15八、注意事项--------------------------------------------------------------------19第 2 页，共 29 页一、概述：1602A1字符型液晶显示模块是专门用于显示字母、数字元、符号等的点阵型液晶显示模块。

MAX4230AUK+T,MAX4230AXK+T,MAX4230AXK+T,MAX4230AXK+T,MAX4231AXT+T,MAX4231AXT+T, 规格书,Datasheet 资料

General DescriptionThe MAX4230–MAX4234 single/dual/quad, high-output-drive CMOS op amps feature 200mA of peak output current, rail-to-rail input, and output capability from a single 2.7V to 5.5V supply. These amplifiers exhibit a high slew rate of 10V/µs and a gain-bandwidth product (GBWP) of 10MHz. The MAX4230–MAX4234 can drive typical headset levels (32Ω), as well as bias an RF power amplifier (PA) in wireless handset applications.The MAX4230 comes in a tiny 5-pin SC70 package and the MAX4231, single with shutdown, is offered in a 6-pin SC70 package and in 1.5mm x 1.0mm UCSP and thin µDFN packages. The dual op-amp MAX4233is offered in the space-saving 10-bump chip-scale pack-age (UCSP™), providing the smallest footprint area for a dual op amp with shutdown.These op amps are designed to be part of the PA con-trol circuitry, biasing RF PAs in wireless headsets. The MAX4231/MAX4233 offer a SHDN feature that drives the output low. This ensures that the RF PA is fully dis-abled when needed, preventing unconverted signals to the RF antenna.The MAX4230 family offers low offsets, wide bandwidth,and high-output drive in a tiny 2.1mm x 2.0mm space-saving SC70 package. These parts are offered over the automotive temperature range (-40°C to +125°C).ApplicationsRF PA Biasing Controls in Handset Applications Portable/Battery-Powered Audio Applications Portable Headphone Speaker Drivers (32Ω)Audio Hands-Free Car Phones (Kits)Laptop/Notebook Computers/TFT Panels Sound Ports/Cards Set-Top BoxesDigital-to-Analog Converter Buffers Transformer/Line Drivers Motor DriversFeatureso 200mA Output Drive Capability o Rail-to-Rail Input and Outputo 1.1mA Supply Current per Amplifier o 2.7V to 5.5V Single-Supply Operation o 10MHz Gain-Bandwidth Product o High Slew Rate: 10V/µso 100dB Voltage Gain (R L = 100k Ω)o 85dB Power-Supply Rejection Ratioo No Phase Reversal for Overdriven Inputso Unity-Gain Stable for Capacitive Loads to 780pF oLow-Power Shutdown Mode Reduces Supply Current to < 1µAo Available in 5-Pin SC70 Package (MAX4230)and 6-Pin, UCSP and Thin µDFN Packages (MAX4231)o Available in 10-Bump UCSP Package (MAX4233)MAX4230–MAX4234High-Output-Drive, 10MHz, 10V/µs,Rail-to-Rail I/O Op Amps with Shutdown in SC70________________________________________________________________Maxim Integrated Products 119-2164; Rev 15; 3/12Selector Guide appears at end of data sheet.Pin Configurations appear at end of data sheet.UCSP is a trademark of Maxim Integrated Products, Inc.Ordering InformationTypical Operating CircuitFor pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,M A X 4230–M A X 4234High-Output-Drive, 10MHz, 10V/µs,Rail-to-Rail I/O Op Amps with Shutdown in SC70ABSOLUTE MAXIMUM RATINGSStresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.Supply Voltage (V DD to V SS )....................................................6V All Other Pins...................................(V SS - 0.3V) to (V DD + 0.3V)Output Short-Circuit Duration to V DD or V SS (Note 1)................10s Continuous Power Dissipation (Multilayer, T A = +70°C)5-Pin SC70 (derate 3.1mW/°C above +70°C)..............247mW 5-Pin SOT23 (derate 3.9mW/°C above +70°C)............313mW 6-Pin SC70 (derate 3.1mW/°C above +70°C)..............245mW 6-Pin SOT23 (derate 13.4mW/°C above +70°C)........1072mW 6-Pin Thin µDFN (derate 2.1mW/°C above +70°C)...170.2mW 6-Bump UCSP (derate 3.9mW/°C above +70°C).....308.3mW 8-Pin SOT23 (derate 5.1mW/°C above +70°C).........408.2mW 8-Pin µMAX ®(derate 4.8mW/°C above +70°C) .......387.8mW 10-Pin µMAX (derate 8.8mW/°C above +70°C) .......707.3mW 10-Bump UCSP (derate 5.6mW/°C above +70°C) .....448.7mW 14-Pin SO (derate 11.9mW/°C above +70°C) ..........952.4mW 14-Pin TSSOP (derate 10mW/°C above +70°C) ......796.8mW Operating Temperature Range .........................-40°C to +125°C Junction Temperature......................................................+150°C Storage Temperature Range.............................-65°C to +150°C Lead Temperature(excluding 6 and 10 UCSP, soldering, 10s)................+300°C Soldering Temperature (reflow).......................................+260°CNote 1:Package power dissipation should also be observed.DC ELECTRICAL CHARACTERISTICSµMAX is a registered trademark of Maxim Integrated Products, Inc.MAX4230–MAX4234High-Output-Drive, 10MHz, 10V/µs,Rail-to-Rail I/O Op Amps with Shutdown in SC70_______________________________________________________________________________________3DC ELECTRICAL CHARACTERISTICS (continued)(V DD = 2.7V, V SS = 0V, V CM = V DD /2, V OUT = (V DD /2), R L = ∞connected to (V DD /2), V SHDN = V DD , T A = +25°C , unless otherwise noted.) (Note 2)DC ELECTRICAL CHARACTERISTICS(V DD = 2.7V, V SS = 0V, V CM = V DD /2, V OUT = (V DD /2), R L = ∞connected to (V DD /2), V SHDN = V DD , T A = -40 to +125°C , unless other-M A X 4230–M A X 4234High-Output-Drive, 10MHz, 10V/µs,Rail-to-Rail I/O Op Amps with Shutdown in SC704_______________________________________________________________________________________Note 3:SHDN logic parameters are for the MAX4231/MAX4233 only.Note 4:Guaranteed by design.DC ELECTRICAL CHARACTERISTICS (continued)AC ELECTRICAL CHARACTERISTICS(V = 2.7V, V = 0V, V = V /2, V = (V /2), R = ∞connected to (V /2), V = V , T = +25°C , unless otherwise noted.)MAX4230–MAX4234High-Output-Drive, 10MHz, 10V/µs,Rail-to-Rail I/O Op Amps with Shutdown in SC70_______________________________________________________________________________________5GAIN AND PHASE vs. FREQUENCYFREQUENCY (Hz)0.01k 10k100k1M10M 0.1k 1k100MG A I N (d B )70-30-20-100102030605040P H A S E (D E G R E E S )120-90-60-300906030GAIN AND PHASE vs. FREQUENCY(C L = 250pF)FREQUENCY (Hz)0.01k 10k100k1M10M 0.1k 1k100MG A I N (d B )70-30-20-100102030605040-180P H A S E (D E G R E E S )120-150-120-90-60-30090603000.40.20.80.61.21.01.41.81.62.0-4002040-206080100120SUPPLY CURRENT vs. TEMPERATUREM A X 4230 t o c 05TEMPERATURE (°C)S U P P L Y C U R R E N T (m A )POWER-SUPPLY REJECTION RATIOvs. FREQUENCYFREQUENCY (Hz)0.01k10k100k1M0.1k1k10MP S R R (d B )0-100-90-80-70-60-50-40-10-20-3010001001010.10.011k100k 1M10k10MOUTPUT IMPEDANCE vs. FREQUENCYFREQUENCY (Hz)O U T P U T I M P E D A N C E (Ω)5060708090100110-400-2020406080100120TEMPERATURE (°C)S U P P L Y C U R R E N T (n A )SUPPLY CURRENT vs. TEMPERATURE(SHDN = LOW)__________________________________________Typical Operating Characteristics(V DD = 2.7V, V SS = 0V, V CM = V DD /2, V OUT = V DD /2, R L = ∞, connected to V DD /2, V SHDN = V DD , T A = +25°C, unless otherwise noted.)M A X 4230–M A X 4234High-Output-Drive, 10MHz, 10V/µs,Rail-to-Rail I/O Op Amps with Shutdown in SC706_______________________________________________________________________________________00.60.40.21.00.81.81.61.41.22.02.02.53.03.54.04.55.05.5M A X 4230 t o c 07SUPPLY VOLTAGE (V)S U P P L Y C U R R E N T (m A )SUPPLY CURRENT PER AMPLIFIERvs. SUPPLY VOLTAGE-40-2020406080100120TEMPERATURE (°C)-2-1012V O S (m V )INPUT OFFSET VOLTAGE vs. TEMPERATURE020406080100-400-2020406080100120OUTPUT SWING HIGH vs. TEMPERATURETEMPERATURE (°C)V D D - V O U T (m V )040208060120100140-40020-20406080100120OUTPUT SWING LOW vs. TEMPERATURETEMPERATURE (°C)V O U T - V S S (m V )0.20.80.60.41.01.21.42.01.50.5 1.0 2.53.0 3.54.0 4.55.0SUPPLY CURRENT PER AMPLIFIER vs. COMMON-MODE VOLTAGECOMMON-MODE VOLTAGE (V)S U P P L Y C U R R E N T (m A )-2.0-1.0-1.5-0.50.501.000.51.01.52.02.5INPUT OFFSET VOLTAGE vs. COMMON-MODE VOLTAGEM A X 4230/3 t o c 11COMMON-MODE VOLTAGE (V)I N P U T O F F S E T V O L T A G E (m V )0.20.60.41.00.81.20.51.01.52.02.5SUPPLY CURRENT PER AMPLIFIER vs. COMMON-MODE VOLTAGECOMMON-MODE VOLTAGE (V)S U P P L Y C U R R E N T (m A )0.45101001k10k100kTOTAL HARMONIC DISTORTION PLUS NOISE vs. FREQUENCY0.05FREQUENCY (Hz)T H D +N (%)0.150.250.350.300.200.1000.40TOTAL HARMONIC DISTORTION PLUS NOISE vs. PEAK-TO-PEAK OUTPUT VOLTAGEPEAK-TO-PEAK OUTPUT VOLTAGE (V)T H D +N (%)100.00014.04.24.65.00.0010.11 4.44.8____________________________Typical Operating Characteristics (continued)(V DD = 2.7V, V SS = 0V, V CM = V DD /2, V OUT = V DD /2, R L = ∞, connected to V DD /2, V SHDN = V DD , T A = +25°C, unless otherwise noted.)MAX4230–MAX4234High-Output-Drive, 10MHz, 10V/µs,Rail-to-Rail I/O Op Amps with Shutdown in SC70_______________________________________________________________________________________7400ns/div SMALL-SIGNAL TRANSIENT RESPONSE (NONINVERTING)IN50mV/divMAX4230/34 toc16OUT400ns/div SMALL-SIGNAL TRANSIENT RESPONSE (INVERTING)IN50mV/divMAX4230/34 toc17OUT400ns/divLARGE-SIGNAL TRANSIENT RESPONSE (NONINVERTING)IN1V/div MAX4230/34 toc18OUT400ns/divLARGE-SIGNAL TRANSIENT RESPONSE (INVERTING)IN1V/divMAX4230/34 toc19OUT0501501002002502.03.02.53.54.04.55.0OUTPUT CURRENT vs. OUTPUT VOLTAGE(SOURCING, V DD = 5.0V)OUTPUT VOLTAGE (V)O U T P U T C U R R E N T (m A )20103060705040801.0 1.4 1.6 1.82.01.2 2.2 2.4 2.6 2.83.0OUTPUT CURRENT vs. OUTPUT VOLTAGE(SOURCING, V DD = 2.7V)OUTPUT VOLTAGE (V)O U T P U T C U R R E N T (m A )-80-60-70-40-50-30-20-10000.40.60.20.8 1.0 1.2 1.4 1.6OUTPUT CURRENT vs. OUTPUT VOLTAGE(SINKING, V DD = 2.7V)OUTPUT VOLTAGE (V)O U T P U T C U R R E N T (m A )-250-200-100-150-5001.00.51.52.02.53.0OUTPUT CURRENT vs. OUTPUT VOLTAGE(SINKING, V DD= 5.0V)OUTPUT VOLTAGE (V)O U T P U T C U R R E N T (m A )2001001010010k 100kFREQUENCY (Hz)I N P U T V O L T A G E N O I S E (n V /√H z )1k INPUT VOLTAGE NOISE vs. FREQUENCYM A X 4230/34 t o c 24____________________________Typical Operating Characteristics (continued)(V DD = 2.7V, V SS = 0V, V CM = V DD /2, V OUT = V DD /2, R L = ∞, connected to V DD /2, V SHDN = V DD , T A = +25°C, unless otherwise noted.)M A X 4230–M A X 4234Detailed DescriptionRail-to-Rail Input StageThe MAX4230–MAX4234 CMOS operational amplifiershave parallel-connected n- and p-channel differential input stages that combine to accept a common-mode range extending to both supply rails. The n-channel stage is active for common-mode input voltages typi-cally greater than (V SS + 1.2V), and the p-channel stage is active for common-mode input voltages typi-cally less than (V DD - 1.2V).Applications InformationPackage Power DissipationWarning: Due to the high output current drive, this op amp can exceed the absolute maximum power-dissi-pation rating.As a general rule, as long as the peak cur-rent is less than or equal to 40mA, the maximum package power dissipation is not exceeded for any of the packagetypes offered. There are some exceptions to this rule,however. The absolute maximum power-dissipation rating of each package should always be verified using the fol-lowing equations. The equation below gives an approxi-mation of the package power dissipation:where:V RMS = RMS voltage from V DD to V OUT when sourcing current and RMS voltage from V OUT to V SS when sink-ing current.I RMS = RMS current flowing out of or into the op amp and the load.θ= phase difference between the voltage and the cur-rent. For resistive loads, COS θ= 1.P V I COS IC DISS RMS RMS ()≅θHigh-Output-Drive, 10MHz, 10V/µs,Rail-to-Rail I/O Op Amps with Shutdown in SC708_______________________________________________________________________________________For example, the circuit in Figure 1 has a package power dissipation of 196mW:where:V DC= the DC component of the output voltage.I DC= the DC component of the output current.V PEAK= the highest positive excursion of the AC com-ponent of the output voltage.I PEAK= the highest positive excursion of the AC com-ponent of the output current.Therefore:P IC(DISS)= V RMS I RMS COS θ= 196mWAdding a coupling capacitor improves the package power dissipation because there is no DC current to the load, as shown in Figure 2:Therefore:P IC(DISS)= V RMS I RMS COS θ= 15.6mWIf the configuration in Figure 1 were used with all four of the MAX4234 amplifiers, the absolute maximum power-dissipation rating of this package would be exceeded (see the Absolute Maximum Ratings section).60mW Single-Supply StereoHeadphone Driver Two MAX4230/MAX4231s can be used as a single-sup-ply, stereo headphone driver. The circuit shown in Figure 2 can deliver 60mW per channel with 1% distor-tion from a single 5V supply.The input capacitor (C IN), in conjunction with R IN, forms a highpass filter that removes the DC bias from the incoming signal. The -3dB point of the highpass filter isgiven by:MAX4230–MAX4234High-Output-Drive, 10MHz, 10V/µs, Rail-to-Rail I/O Op Amps with Shutdown in SC70_______________________________________________________________________________________9Figure 2. Circuit Example: Adding a Coupling CapacitorGreatly Reduces Power Dissipation of its PackageFigure 1. MAX4230/MAX4231 Used in Single-Supply OperationCircuit ExampleM A X 4230–M A X 4234Choose gain-setting resistors R IN and R F according to the amount of desired gain, keeping in mind the maxi-mum output amplitude. The output coupling capacitor,C OUT , blocks the DC component of the amplifier out-put, preventing DC current flowing to the load. The out-put capacitor and the load impedance form a highpass filer with the -3dB point determined by:For a 32Ωload, a 100µF aluminum electrolytic capaci-tor gives a low-frequency pole at 50Hz.Bridge AmplifierThe circuit shown in Figure 3 uses a dual MAX4230 to implement a 3V, 200mW amplifier suitable for use in size-constrained applications. This configuration elimi-nates the need for the large coupling capacitor required by the single op-amp speaker driver when sin-gle-supply operation is necessary. Voltage gain is set to 10V/V; however, it can be changed by adjusting the 82k Ωresistor value.Rail-to-Rail Input StageThe MAX4230–MAX4234 CMOS op amps have parallel-connected n- and p-channel differential input stages that combine to accept a common-mode range extend-ing to both supply rails. The n-channel stage is active for common-mode input voltages typically greater than (V SS + 1.2V), and the p-channel stage is active for common-mode input voltages typically less than (V DD -1.2V).Rail-to-Rail Output StageThe minimum output is within millivolts of ground for sin-gle-supply operation, where the load is referenced to ground (V SS ). Figure 4 shows the input voltage range and the output voltage swing of a MAX4230 connected as a voltage follower. The maximum output voltage swing is load dependent; however, it is guaranteed to be within 500mV of the positive rail (V DD = 2.7V) even with maximum load (32Ωto ground).Observe the Absolute Maximum Ratings for power dis-sipation and output short-circuit duration (10s, max)because the output current can exceed 200mA (see the Typical Operating Characteristics .)Input CapacitanceOne consequence of the parallel-connected differential input stages for rail-to-rail operation is a relatively large input capacitance C IN (5pF typ). This introduces a pole at frequency (2πR ′C IN )-1, where R ′is the parallel combi-nation of the gain-setting resistors for the inverting or noninverting amplifier configuration (Figure 5). If the pole frequency is less than or comparable to the unity-gain bandwidth (10MHz), the phase margin is reduced, and the amplifier exhibits degraded AC performance through either ringing in the step response or sustained oscilla-tions. The pole frequency is 10MHz when R ′= 2k Ω. To maximize stability, R ′<< 2k Ωis recommended.High-Output-Drive, 10MHz, 10V/µs,Rail-to-Rail I/O Op Amps with Shutdown in SC7010______________________________________________________________________________________Figure 4. Rail-to-Rail Input/Output RangeFigure 3. Dual MAX4230/MAX4231 Bridge Amplifier for 200mW at 3VIN 1V/divOUT 1V/div5µs/divV CC = 3.0V R L = 100k ΩTo improve step response when R ′> 2k Ω, connect small capacitor C f between the inverting input and out-put. Choose C f as follows:C f = 8(R / R f ) [pf]where R f is the feedback resistor and R is the gain-set-ting resistor (Figure 5).Driving Capacitive LoadsThe MAX4230–MAX4234 have a high tolerance for capacitive loads. They are stable with capacitive loads up to 780pF. Figure 6 is a graph of the stable operating region for various capacitive loads vs. resistive loads.Figures 7 and 8 show the transient response with excessive capacitive loads (1500pF), with and without the addition of an isolation resistor in series with the output. Figure 9 shows a typical noninverting capaci-tive-load-driving circuit in the unity-gain configuration.MAX4230–MAX4234Rail-to-Rail I/O Op Amps with Shutdown in SC70Figure 5. Inverting and Noninverting Amplifiers with Feedback CompensationFigure 6. Capacitive-Load Stability1µs/divV DD = 3.0V, C L = 1500pF R L = 100k Ω, R ISO = 39ΩFigure 8. Small-Signal Transient Response with Excessive Capacitive Load with Isolation Resistor1µs/divV DD = 3.0V, C L = 1500pF R L = 100k Ω, R ISO = 0ΩFigure 7. Small-Signal Transient Response with Excessive Capacitive LoadM A X 4230–M A X 4234The resistor improves the circuit’s phase margin by iso-lating the load capacitor from the op amp’s output.Power-Up and Shutdown ModesThe MAX4231/MAX4233 have a shutdown option. When the shutdown pin (SHDN ) is pulled low, supply current drops to 0.5µA per amplifier (V DD = 2.7V), the ampli-fiers are disabled, and their outputs are driven to V SS .Since the outputs are actively driven to V SS in shut-down, any pullup resistor on the output causes a cur-rent drain from the supply. Pulling SHDN high enables the amplifier. In the dual MAX4233, the two amplifiers shut down independently. Figure 10 shows the MAX4231’s output voltage to a shutdown pulse. The MAX4231–MAX4234 typically settle within 5µs after power-up. Figures 11 and 12 show I DD to a shutdown plus and voltage power-up cycle.When exiting shutdown, there is a 6µs delay before the amplifier’s output becomes active (Figure 10).Rail-to-Rail I/O Op Amps with Shutdown in SC70Figure 9. Capacitive-Load-Driving Circuit 100µs/divFigure 11. Shutdown Enable/Disable Supply Current40µs/divFigure 12. Power-Up/Down Supply Current4µs/divFigure 10. Shutdown Output Voltage Enable/Disable Selector GuideAMPS PER PACKAGE SHUTDOWN Single Single Dual Dual QuadMAX4230–MAX4234Rail-to-Rail I/O Op Amps with Shutdown in SC70Pin ConfigurationsPower Supplies and LayoutThe MAX4230–MAX4234 can operate from a single 2.7V to 5.5V supply, or from dual ±1.35V to ±2.5V sup-plies. For single-supply operation, bypass the power supply with a 0.1µF ceramic capacitor. For dual-supply operation, bypass each supply to ground. Good layout improves performance by decreasing the amount of stray capacitance at the op amps’ inputs and outputs.Decrease stray capacitance by placing external com-ponents close to the op amps’ pins, minimizing trace and lead lengths.Ordering Information (continued)M A X 4230–M A X 4234Rail-to-Rail I/O Op Amps with Shutdown in SC70Package InformationFor the latest package outline information and land patterns, go to /packages . Note that a “+”, “#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status.MAX4230–MAX4234Rail-to-Rail I/O Op Amps with Shutdown in SC70Package Information (continued)For the latest package outline information and land patterns, go to /packages . Note that a “+”, “#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status.M A X 4230–M A X 4234Rail-to-Rail I/O Op Amps with Shutdown in SC70Package Information (continued)For the latest package outline information and land patterns, go to /packages . Note that a “+”, “#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status.MAX4230–MAX4234Rail-to-Rail I/O Op Amps with Shutdown in SC70Package Information (continued)For the latest package outline information and land patterns, go to /packages . Note that a “+”, “#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status.M A X 4230–M A X 4234Rail-to-Rail I/O Op Amps with Shutdown in SC70Package Information (continued)For the latest package outline information and land patterns, go to /packages . Note that a “+”, “#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status.MAX4230–MAX4234Rail-to-Rail I/O Op Amps with Shutdown in SC70Package Information (continued)For the latest package outline information and land patterns, go to /packages . Note that a “+”, “#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status.M A X 4230–M A X 4234Rail-to-Rail I/O Op Amps with Shutdown in SC70Package Information (continued)For the latest package outline information and land patterns, go to /packages . Note that a “+”, “#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status.MAX4230–MAX4234Rail-to-Rail I/O Op Amps with Shutdown in SC70______________________________________________________________________________________21Package Information (continued)For the latest package outline information and land patterns, go to /packages . Note that a “+”, “#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status.M A X 4230–M A X 4234Rail-to-Rail I/O Op Amps with Shutdown in SC7022______________________________________________________________________________________Package Information (continued)For the latest package outline information and land patterns, go to /packages . Note that a “+”, “#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status.MAX4230–MAX4234Rail-to-Rail I/O Op Amps with Shutdown in SC70______________________________________________________________________________________23Package Information (continued)For the latest package outline information and land patterns, go to /packages . Note that a “+”, “#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status.M A X 4230–M A X 4234Rail-to-Rail I/O Op Amps with Shutdown in SC7024______________________________________________________________________________________Package Information (continued)For the latest package outline information and land patterns, go to /packages . Note that a “+”, “#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to thepackage regardless of RoHS status.MAX4230–MAX4234Rail-to-Rail I/O Op Amps with Shutdown in SC70______________________________________________________________________________________25Package Information (continued)For the latest package outline information and land patterns, go to /packages . Note that a “+”, “#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to thepackage regardless of RoHS status.M A X 4230–M A X 4234Rail-to-Rail I/O Op Amps with Shutdown in SC7026______________________________________________________________________________________Package Information (continued)For the latest package outline information and land patterns, go to /packages . Note that a “+”, “#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status.MAX4230–MAX4234Rail-to-Rail I/O Op Amps with Shutdown in SC70______________________________________________________________________________________27Package Information (continued)For the latest package outline information and land patterns, go to /packages . Note that a “+”, “#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status.M A X 4230–M A X 4234Rail-to-Rail I/O Op Amps with Shutdown in SC70Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. The parametric values (min and max limits) shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance.28____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600©2012 Maxim Integrated ProductsMaxim is a registered trademark of Maxim Integrated Products, Inc.Revision History。

1602显示汉字和自定义字符库

1602液晶模块内部的字符发生存储器（CGROM)已经存储了160个不同的点阵字符图形，这些字符有：阿拉伯数字、英文字母的大小写、常用的符号、和日文假名等，但是没有汉字库。

每一个字符都有一个固定的代码，比如大写的英文字母“A”的代码是01000001B（41H），显示时模块把地址41H中的点阵字符图形显示出来，我们就能看到字母“A”。

今天偶然在网上发现有的人利用1602显示简单的汉字，对这个产生了兴趣，上网搜了一些资料，自己慢慢的研究了一下，终于弄懂了怎么回事，自己也写了一个显示“天”，“℃”，“你”，“土”，心形，“明”的程序。

下面就和大家一起分享一下。

查看LCD1602的CGROM字符代码表，可以发现从00000000B~00000111B （00H~07H）地址的内容是没有定义的，它是留给用户自己定义的，用户可以通过先定义LCD1602的CGRAM中的内容，最多可以自定义8个字符，然后就可以同调用CGROM字符一样来调用自定义好的字符。

那么如何设定CGRAM中的内容呢？首先我们要把所要编写的字符对应于5X8点阵的“字模”提取出来，我们可以通过相关的软件来提取，也可以手工提取。

说白了也就是将点阵的某一行中有显示的点用1表示，无显示的点用0表示，以此形成该行对应的字模数据。

设定CGRAM的内容，要一行一行的设定，每一行对应一个CGRAM，5X8点阵，每行5点，共8行，因此要将8行的字模数据都写入CGRAM。

写好后,就可像调用CGROM字符一样来来调用它了（CGRAM是可写可读的，CGROM只可读不可写）。

下面贴出我的程序（见1602LCD文件夹中的1602显示汉字.Uv2文件），实物图和Proteus仿真图，由于一个字符的点数为5X8，点数太少所以显示效果不是很好，经实验发现实物效果比仿真要好，下面为两者的效果图。

MAX3232EETE+T中文资料

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,or visit Maxim's website at .General DescriptionThe MAX3222E/MAX3232E/MAX3237E/MAX3241E/MAX3246E +3.0V-powered EIA/TIA-232 and V.28/V.24communications interface devices feature low power con-sumption, high data-rate capabilities, and enhanced electrostatic-discharge (ESD) protection. The enhanced ESD structure protects all transmitter outputs and receiver inputs to ±15kV using IEC 1000-4-2 Air-G ap Discharge, ±8kV using IEC 1000-4-2 Contact Discharge (±9kV for MAX3246E), and ±15kV using the Human Body Model. The logic and receiver I/O pins of the MAX3237E are protected to the above standards, while the transmit-ter output pins are protected to ±15kV using the Human Body Model.A proprietary low-dropout transmitter output stage delivers true RS-232 performance from a +3.0V to +5.5V power supply, using an internal dual charge pump. The charge pump requires only four small 0.1µF capacitors for opera-tion from a +3.3V supply. Each device guarantees opera-tion at data rates of 250kbps while maintaining RS-232output levels. The MAX3237E guarantees operation at 250kbps in the normal operating mode and 1Mbps in the MegaBaud™ operating mode, while maintaining RS-232-compliant output levels.The MAX3222E/MAX3232E have two receivers and two transmitters. The MAX3222E features a 1µA shutdown mode that reduces power consumption in battery-pow-ered portable systems. The MAX3222E receivers remain active in shutdown mode, allowing monitoring of external devices while consuming only 1µA of supply current. The MAX3222E and MAX3232E are pin, package, and func-tionally compatible with the industry-standard MAX242and MAX232, respectively.The MAX3241E/MAX3246E are complete serial ports (three drivers/five receivers) designed for notebook and subnotebook computers. The MAX3237E (five drivers/three receivers) is ideal for peripheral applications that require fast data transfer. These devices feature a shut-down mode in which all receivers remain active, while consuming only 1µA (MAX3241E/MAX3246E) or 10nA (MAX3237E).The MAX3222E, MAX3232E, and MAX3241E are avail-able in space-saving SO, SSOP, TQFN and TSSOP pack-ages. The MAX3237E is offered in an SSOP package.The MAX3246E is offered in the ultra-small 6 x 6 UCSP™package.ApplicationsBattery-Powered Equipment PrintersCell PhonesSmart Phones Cell-Phone Data Cables xDSL ModemsNotebook, Subnotebook,and Palmtop ComputersNext-Generation Device Features♦For Space-Constrained ApplicationsMAX3228E/MAX3229E: ±15kV ESD-Protected, +2.5V to +5.5V, RS-232 Transceivers in UCSP ♦For Low-Voltage or Data Cable ApplicationsMAX3380E/MAX3381E: +2.35V to +5.5V, 1µA, 2Tx/2Rx, RS-232 Transceivers with ±15kV ESD-Protected I/O and Logic PinsMAX3222E/MAX3232E/MAX3237E/MAX3241E †/MAX3246E±15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V ,Up to 1Mbps, True RS-232 Transceivers________________________________________________________________Maxim Integrated Products 119-1298; Rev 11; 10/07Ordering Information continued at end of data sheet.*Dice are tested at T A = +25°C, DC parameters only.**EP = Exposed paddle.Pin Configurations, Selector Guide, and Typical Operating Circuits appear at end of data sheet.MegaBaud and UCSP are trademarks of Maxim Integrated Products, Inc.†Covered by U.S. Patent numbers 4,636,930; 4,679,134;4,777,577; 4,797,899; 4,809,152; 4,897,774; 4,999,761; and other patents pending.M A X 3222E /M A X 3232E /M A X 3237E /M A X 3241E †/M A X 3246EUp to 1Mbps, True RS-232 TransceiversABSOLUTE MAXIMUM RATINGSELECTRICAL CHARACTERISTICS(V CC = +3V to +5.5V, C1–C4 = 0.1µF, T A = T MIN to T MAX , unless otherwise noted. Typical values are at T A = +25°C.) (Notes 3, 4)Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.V CC to GND..............................................................-0.3V to +6V V+ to GND (Note 1)..................................................-0.3V to +7V V- to GND (Note 1)...................................................+0.3V to -7V V+ + |V-| (Note 1).................................................................+13V Input Voltages T_IN, EN , SHDN , MBAUD to GND ........................-0.3V to +6V R_IN to GND.....................................................................±25V Output Voltages T_OUT to GND...............................................................±13.2V R_OUT, R_OUTB (MAX3241E)................-0.3V to (V CC + 0.3V)Short-Circuit Duration, T_OUT to GND.......................Continuous Continuous Power Dissipation (T A = +70°C)16-Pin SSOP (derate 7.14mW/°C above +70°C)..........571mW 16-Pin TSSOP (derate 9.4mW/°C above +70°C).......754.7mW 16-Pin TQFN (derate 20.8mW/°C above +70°C).....1666.7mW 16-Pin Wide SO (derate 9.52mW/°C above +70°C).....762mW 18-Pin Wide SO (derate 9.52mW/°C above +70°C).....762mW 18-Pin PDIP (derate 11.11mW/°C above +70°C)..........889mW 20-Pin TQFN (derate 21.3mW/°C above +70°C)........1702mW 20-Pin TSSOP (derate 10.9mW/°C above +70°C)........879mW 20-Pin SSOP (derate 8.00mW/°C above +70°C)..........640mW 28-Pin SSOP (derate 9.52mW/°C above +70°C)..........762mW 28-Pin Wide SO (derate 12.50mW/°C above +70°C).............1W 28-Pin TSSOP (derate 12.8mW/°C above +70°C)......1026mW 32-Lead Thin QFN (derate 33.3mW/°C above +70°C)..2666mW 6 x 6 UCSP (derate 12.6mW/°C above +70°C).............1010mW Operating Temperature Ranges MAX32_ _EC_ _...................................................0°C to +70°C MAX32_ _EE_ _.................................................-40°C to +85°C Storage Temperature Range.............................-65°C to +150°C Lead Temperature (soldering, 10s).................................+300°C Bump Reflow Temperature (Note 2)Infrared, 15s..................................................................+200°C Vapor Phase, 20s..........................................................+215°C Note 1:V+ and V- can have maximum magnitudes of 7V, but their absolute difference cannot exceed 13V.Note 2:This device is constructed using a unique set of packaging techniques that impose a limit on the thermal profile the devicecan be exposed to during board-level solder attach and rework. This limit permits only the use of the solder profiles recom-mended in the industry-standard specification, JEDEC 020A, paragraph 7.6, Table 3 for IR/VPR and convection reflow.Preheating is required. Hand or wave soldering is not allowed.MAX3222E/MAX3232E/MAX3237E/MAX3241E †/MAX3246EUp to 1Mbps, True RS-232 Transceivers_______________________________________________________________________________________3M A X 3222E /M A X 3232E /M A X 3237E /M A X 3241E †/M A X 3246EUp to 1Mbps, True RS-232 Transceivers4_______________________________________________________________________________________TIMING CHARACTERISTICS—MAX3237E(V CC = +3V to +5.5V, C1–C4 = 0.1µF, T A = T MIN to T MAX , unless otherwise noted. Typical values are at T A = +25°C.) (Note 3)±10%. MAX3237E: C1–C4 = 0.1µF tested at +3.3V ±5%, C1–C4 = 0.22µF tested at +3.3V ±10%; C1 = 0.047µF, C2, C3, C4 =0.33µF tested at +5.0V ±10%. MAX3246E; C1-C4 = 0.22µF tested at +3.3V ±10%; C1 = 0.22µF, C2, C3, C4 = 0.54µF tested at 5.0V ±10%.Note 4:MAX3246E devices are production tested at +25°C. All limits are guaranteed by design over the operating temperature range.Note 5:The MAX3237E logic inputs have an active positive feedback resistor. The input current goes to zero when the inputs are atthe supply rails.Note 6:MAX3241EEUI is specified at T A = +25°C.Note 7:Transmitter skew is measured at the transmitter zero crosspoints.TIMING CHARACTERISTICS—MAX3222E/MAX3232E/MAX3241E/MAX3246EMAX3222E/MAX3232E/MAX3237E/MAX3241E †/MAX3246EUp to 1Mbps, True RS-232 Transceivers_______________________________________________________________________________________5-6-4-202460MAX3237ETRANSMITTER OUTPUT VOLTAGE vs. LOAD CAPACITANCE (MBAUD = GND)LOAD CAPACITANCE (pF)T R A N S M I T T E R O U T P U T V O L T A G E (V )10001500500200025003000531-1-3-5-6-2-42046-5-31-135010001500500200025003000LOAD CAPACITANCE (pF)T R A N S M I T T E R O U T P U T V O L T A G E (V )MAX3237ETRANSMITTER OUTPUT VOLTAGEvs. LOAD CAPACITANCE-7.5-5.0-2.502.55.07.5MAX3237ETRANSMITTER OUTPUT VOLTAGE vs. LOAD CAPACITANCE (MBAUD = V CC )LOAD CAPACITANCE (pF)T R A N S M I T T E R O U T P U T V O L T A G E (V )500100015002000__________________________________________Typical Operating Characteristics(V CC = +3.3V, 250kbps data rate, 0.1µF capacitors, all transmitters loaded with 3k Ωand C L , T A = +25°C, unless otherwise noted.)-6-5-4-3-2-10123456010002000300040005000MAX3241ETRANSMITTER OUTPUT VOLTAGEvs. LOAD CAPACITANCELOAD CAPACITANCE (pF)T R A N S M I T T E R O U T P U T V O L T A G E (V)302010405060020001000300040005000MAX3241EOPERATING SUPPLY CURRENT vs. LOAD CAPACITANCELOAD CAPACITANCE (pF)S U P P L Y C U R R E N T (m A )04286121014010002000300040005000MAX3241ESLEW RATE vs. LOAD CAPACITANCEM A X 3237E t o c 05LOAD CAPACITANCE (pF)S L E W R A T E (V /μs )-6-5-4-3-2-10123456010002000300040005000MAX3222E/MAX3232ETRANSMITTER OUTPUT VOLTAGEvs. LOAD CAPACITANCELOAD CAPACITANCE (pF)T R A N S M I T T E R O U T P UT V O L T A G E (V )624108141216010002000300040005000MAX3222E/MAX3232ESLEW RATE vs. LOAD CAPACITANCELOAD CAPACITANCE (pF)S L E W R A T E (V /μs)2520155103530404520001000300040005000MAX3222E/MAX3232E OPERATING SUPPLY CURRENT vs. LOAD CAPACITANCELOAD CAPACITANCE (pF)S U P P L Y C U R R E N T (m A )M A X 3222E /M A X 3232E /M A X 3237E /M A X 3241E †/M A X 3246EUp to 1Mbps, True RS-232 Transceivers6_______________________________________________________________________________________Typical Operating Characteristics (continued)(V CC = +3.3V, 250kbps data rate, 0.1µF capacitors, all transmitters loaded with 3k Ωand C L , T A = +25°C, unless otherwise noted.)20604080100MAX3237ETRANSMITTER SKEW vs. LOAD CAPACITANCE(MBAUD = V CC )LOAD CAPACITANCE (pF)100015005002000T R A N S M I T T E R S K E W (n s )-6-2-42046-3-51-1352.03.03.52.54.04.55.0SUPPLY VOLTAGE (V)T R A N S M I T T E R O U T P U T V O L T A G E (V )MAX3237ETRANSMITTER OUTPUT VOLTAGE vs. SUPPLY VOLTAGE (MBAUD = GND)10203040502.0MAX3237E SUPPLY CURRENT vs. SUPPLY VOLTAGE (MBAUD = GND)SUPPLY VOLTAGE (V)S U P P L Y C U R R E N T (m A )3.03.52.54.04.55.0MAX3246ETRANSMITTER OUTPUT VOLTAGEvs. LOAD CAPACITANCELOAD CAPACITANCE (pF)T R A N S M I T T E R O U T P U T V O L T A G E (V )4000300010002000-5-4-3-2-101234567-65000468101214160MAX3246ESLEW RATE vs. LOAD CAPACITANCELOAD CAPACITANCE (pF)S L EW R A T E (V /μs )200030001000400050001020304050600MAX3246EOPERATING SUPPLY CURRENT vs. LOAD CAPACITANCEM A X 3237E t o c 17LOAD CAPACITANCE (pF)S U P P L Y C U R R EN T (m A )1000200030004000500055453525155024681012MAX3237ESLEW RATE vs. LOAD CAPACITANCE(MBAUD = GND)LOAD CAPACITANCE (pF)S L E W R A T E (V /μs )10001500500200025003000010203050406070MAX3237ESLEW RATE vs. LOAD CAPACITANCE(MBAUD = V CC )LOAD CAPACITANCE (pF)S L E W R A T E (V /μs )5001000150020001020304050MAX3237ESUPPLY CURRENT vs. LOAD CAPACITANCE WHEN TRANSMITTING DATA (MBAUD = GND)LOAD CAPACITANCE (pF)S U P P L Y C U R R E N T (m A )10001500500200025003000MAX3222E/MAX3232E/MAX3237E/MAX3241E †/MAX3246EUp to 1Mbps, True RS-232 Transceivers_______________________________________________________________________________________7Pin DescriptionM A X 3222E /M A X 3232E /M A X 3237E /M A X 3241E †/M A X 3246EUp to 1Mbps, True RS-232 Transceivers8_______________________________________________________________________________________MAX3222E/MAX3232E/MAX3237E/MAX3241E †/MAX3246EUp to 1Mbps, True RS-232 Transceivers_______________________________________________________________________________________9Detailed DescriptionDual Charge-Pump Voltage ConverterThe MAX3222E/MAX3232E/MAX3237E/MAX3241E/MAX3246Es’ internal power supply consists of a regu-lated dual charge pump that provides output voltages of +5.5V (doubling charge pump) and -5.5V (inverting charge pump) over the +3.0V to +5.5V V CC range. The charge pump operates in discontinuous mode; if the output voltages are less than 5.5V, the charge pump is enabled, and if the output voltages exceed 5.5V, the charge pump is disabled. Each charge pump requires a flying capacitor (C1, C2) and a reservoir capacitor (C3, C4) to generate the V+ and V- supplies (Figure 1).RS-232 TransmittersThe transmitters are inverting level translators that con-vert TTL/CMOS-logic levels to ±5V EIA/TIA-232-compli-ant levels.The MAX3222E/MAX3232E/MAX3237E/MAX3241E/MAX3246E transmitters guarantee a 250kbps data rate with worst-case loads of 3k Ωin parallel with 1000pF,providing compatibility with PC-to-PC communication software (such as LapLink™). Transmitters can be par-alleled to drive multiple receivers or mice.The MAX3222E/MAX3237E/MAX3241E/MAX3246E transmitters are disabled and the outputs are forcedinto a high-impedance state when the device is in shut-down mode (SHDN = G ND). The MAX3222E/MAX3232E/MAX3237E/MAX3241E/MAX3246E permit the outputs to be driven up to ±12V in shutdown.The MAX3222E/MAX3232E/MAX3241E/MAX3246E transmitter inputs do not have pullup resistors. Connect unused inputs to GND or V CC . The MAX3237E’s trans-mitter inputs have a 400k Ωactive positive-feedback resistor, allowing unused inputs to be left unconnected.MAX3237E MegaBaud OperationFor higher-speed serial communications, the MAX3237E features MegaBaud operation. In MegaBaud operating mode (MBAUD = V CC ), the MAX3237E transmitters guarantee a 1Mbps data rate with worst-case loads of 3k Ωin parallel with 250pF for +3.0V < V CC < +4.5V. For +5V ±10% operation, the MAX3237E transmitters guarantee a 1Mbps data rate into worst-case loads of 3k Ωin parallel with 1000pF.RS-232 ReceiversThe receivers convert RS-232 signals to CMOS-logic output levels. The MAX3222E/MAX3237E/MAX3241E/MAX3246E receivers have inverting three-state outputs.Drive EN high to place the receiver(s) into a high-impedance state. Receivers can be either active or inactive in shutdown (Table 1).Figure 1. Slew-Rate Test CircuitsLapLink is a trademark of Traveling Software.M A X 3222E /M A X 3232E /M A X 3237E /M A X 3241E †/M A X 3246EUp to 1Mbps, True RS-232 Transceivers10______________________________________________________________________________________The complementary outputs on the MAX3237E/MAX3241E (R_OUTB) are always active, regardless of the state of EN or SHDN . This allows the device to be used for ring indicator applications without forward biasing other devices connected to the receiver outputs. This is ideal for systems where V CC drops to zero in shutdown to accommodate peripherals such as UARTs (Figure 2).MAX3222E/MAX3237E/MAX3241E/MAX3246E Shutdown ModeSupply current falls to less than 1µA in shutdown mode (SHDN = low). The MAX3237E’s supply current falls to10nA (typ) when all receiver inputs are in the invalid range (-0.3V < R_IN < +0.3). When shut down, the device’s charge pumps are shut off, V+ is pulled down to V CC , V- is pulled to ground, and the transmitter out-puts are disabled (high impedance). The time required to recover from shutdown is typically 100µs, as shown in Figure 3. Connect SHDN to V CC if shutdown mode is not used. SHDN has no effect on R_OUT or R_OUTB (MAX3237E/MAX3241E).±15kV ESD ProtectionAs with all Maxim devices, ESD-protection structures are incorporated to protect against electrostatic dis-charges encountered during handling and assembly.The driver outputs and receiver inputs of the MAX3222E/MAX3232E/MAX3237E/MAX3241E/MAX3246E have extra protection against static electricity. Maxim’s engineers have developed state-of-the-art structures to protect these pins against ESD of ±15kV without damage.The ESD structures withstand high ESD in all states:normal operation, shutdown, and powered down. After an ESD event, Maxim’s E versions keep working without latchup, whereas competing RS-232 products can latch and must be powered down to remove latchup.Furthermore, the MAX3237E logic I/O pins also have ±15kV ESD protection. Protecting the logic I/O pins to ±15kV makes the MAX3237E ideal for data cable applications.SHDN T2OUTT1OUT5V/div2V/divV CC = 3.3V C1–C4 = 0.1μFFigure 3. Transmitter Outputs Recovering from Shutdown or Powering UpMAX3222E/MAX3232E/MAX3237E/MAX3241E †/MAX3246EUp to 1Mbps, True RS-232 TransceiversESD protection can be tested in various ways; the transmitter outputs and receiver inputs for the MAX3222E/MAX3232E/MAX3241E/MAX3246E are characterized for protection to the following limits:•±15kV using the Human Body Model•±8kV using the Contact Discharge method specified in IEC 1000-4-2•±9kV (MAX3246E only) using the Contact Discharge method specified in IEC 1000-4-2•±15kV using the Air-G ap Discharge method speci-fied in IEC 1000-4-2Figure 4a. Human Body ESD Test ModelFigure 4b. Human Body Model Current WaveformFigure 5a. IEC 1000-4-2 ESD Test Model Figure 5b. IEC 1000-4-2 ESD Generator Current WaveformM A X 3222E /M A X 3232E /M A X 3237E /M A X 3241E †/M A X 3246EUp to 1Mbps, True RS-232 Transceiverscharacterized for protection to ±15kV per the Human Body Model.ESD Test ConditionsESD performance depends on a variety of conditions.Contact Maxim for a reliability report that documents test setup, test methodology, and test results.Human Body ModelFigure 4a shows the Human Body Model, and Figure 4b shows the current waveform it generates when dis-charged into a low impedance. This model consists of a 100pF capacitor charged to the ESD voltage of interest,which is then discharged into the test device through a 1.5k Ωresistor.IEC 1000-4-2The IEC 1000-4-2 standard covers ESD testing and performance of finished equipment; it does not specifi-cally refer to integrated circuits. The MAX3222E/MAX3232E/MAX3237E/MAX3241E/MAX3246E help you design equipment that meets level 4 (the highest level)of IEC 1000-4-2, without the need for additional ESD-protection components.The major difference between tests done using the Human Body Model and IEC 1000-4-2 is higher peak current in IEC 1000-4-2, because series resistance is lower in the IEC 1000-4-2 model. Hence, the ESD with-stand voltage measured to IEC 1000-4-2 is generally lower than that measured using the Human Body Model. Figure 5a shows the IEC 1000-4-2 model, and Figure 5b shows the current waveform for the ±8kV IEC 1000-4-2 level 4 ESD Contact Discharge test. The Air-G ap Discharge test involves approaching the device with a charged probe. The Contact Discharge method connects the probe to the device before the probe is energized.Machine ModelThe Machine Model for ESD tests all pins using a 200pF storage capacitor and zero discharge resis-tance. Its objective is to emulate the stress caused by contact that occurs with handling and assembly during manufacturing. All pins require this protection during manufacturing, not just RS-232 inputs and outputs.Therefore, after PC board assembly, the Machine Model is less relevant to I/O ports.Table 2. Required Minimum Capacitor ValuesFigure 6a. MAX3241E Transmitter Output Voltage vs. Load Current Per TransmitterTable 3. Logic-Family Compatibility with Various Supply VoltagesMAX3222E/MAX3232E/MAX3237E/MAX3241E †/MAX3246EUp to 1Mbps, True RS-232 TransceiversApplications InformationCapacitor SelectionThe capacitor type used for C1–C4 is not critical for proper operation; polarized or nonpolarized capacitors can be used. The charge pump requires 0.1µF capaci-tors for 3.3V operation. For other supply voltages, see Table 2 for required capacitor values. Do not use val-ues smaller than those listed in Table 2. Increasing the capacitor values (e.g., by a factor of 2) reduces ripple on the transmitter outputs and slightly reduces power consumption. C2, C3, and C4 can be increased without changing C1’s value. However, do not increase C1without also increasing the values of C2, C3, C4,and C BYPASS to maintain the proper ratios (C1 to the other capacitors).When using the minimum required capacitor values,make sure the capacitor value does not degradeexcessively with temperature. If in doubt, use capaci-tors with a larger nominal value. The capacitor’s equiv-alent series resistance (ESR), which usually rises at low temperatures, influences the amount of ripple on V+and V-.Power-Supply DecouplingIn most circumstances, a 0.1µF V CC bypass capacitor is adequate. In applications sensitive to power-supply noise, use a capacitor of the same value as charge-pump capacitor C1. Connect bypass capacitors as close to the IC as possible.Operation Down to 2.7VTransmitter outputs meet EIA/TIA-562 levels of ±3.7V with supply voltages as low as 2.7V.Figure 6b. Mouse Driver Test CircuitM A X 3222E /M A X 3232E /M A X 3237E /M A X 3241E †/M A X 3246EUp to 1Mbps, True RS-232 TransceiversFigure 7. Loopback Test CircuitT1IN T1OUTR1OUT5V/div5V/div5V/divV CC = 3.3V C1–C4 = 0.1μFFigure 8. MAX3241E Loopback Test Result at 120kbps T1INT1OUTR1OUT5V/div5V/div5V/divV CC = 3.3V, C1–C4 = 0.1μFFigure 9. MAX3241E Loopback Test Result at 250kbps+5V 0+5V 0-5V +5VT_INT_OUT5k Ω + 250pFR_OUTV CC = 3.3V C1–C4 = 0.1μFFigure 10. MAX3237E Loopback Test Result at 1000kbps (MBAUD = V CC )Transmitter Outputs Recoveringfrom ShutdownFigure 3 shows two transmitter outputs recovering from shutdown mode. As they become active, the two trans-mitter outputs are shown going to opposite RS-232 levels (one transmitter input is high; the other is low). Each transmitter is loaded with 3k Ωin parallel with 2500pF.The transmitter outputs display no ringing or undesir-able transients as they come out of shutdown. Note thatthe transmitters are enabled only when the magnitude of V- exceeds approximately -3.0V.Mouse DrivabilityThe MAX3241E is designed to power serial mice while operating from low-voltage power supplies. It has been tested with leading mouse brands from manu-facturers such as Microsoft and Logitech. The MAX3241E successfully drove all serial mice tested and met their current and voltage requirements.MAX3222E/MAX3232E/MAX3237E/MAX3241E †/MAX3246EUp to 1Mbps, True RS-232 TransceiversFigure 6a shows the transmitter output voltages under increasing load current at +3.0V. Figure 6b shows a typical mouse connection using the MAX3241E.High Data RatesThe MAX3222E/MAX3232E/MAX3237E/MAX3241E/MAX3246E maintain the RS-232 ±5V minimum transmit-ter output voltage even at high data rates. Figure 7shows a transmitter loopback test circuit. Figure 8shows a loopback test result at 120kbps, and Figure 9shows the same test at 250kbps. For Figure 8, all trans-mitters were driven simultaneously at 120kbps into RS-232 loads in parallel with 1000pF. For Figure 9, a single transmitter was driven at 250kbps, and all transmitters were loaded with an RS-232 receiver in parallel with 1000pF.The MAX3237E maintains the RS-232 ±5.0V minimum transmitter output voltage at data rates up to 1Mbps.Figure 10 shows a loopback test result at 1Mbps with MBAUD = V CC . For Figure 10, all transmitters were loaded with an RS-232 receiver in parallel with 250pF.Interconnection with 3V and 5V LogicThe MAX3222E/MAX3232E/MAX3237E/MAX3241E/MAX3246E can directly interface with various 5V logic families, including ACT and HCT CMOS. See Table 3for more information on possible combinations of inter-connections.UCSP ReliabilityThe UCSP represents a unique packaging form factor that may not perform equally to a packaged product through traditional mechanical reliability tests. UCSP reliability is integrally linked to the user’s assembly methods, circuit board material, and usage environ-ment. The user should closely review these areas when considering use of a UCSP package. Performance through Operating Life Test and Moisture Resistance remains uncompromised as the wafer-fabrication process primarily determines it.Mechanical stress performance is a greater considera-tion for a UCSP package. UCSPs are attached through direct solder contact to the user’s PC board, foregoing the inherent stress relief of a packaged product lead frame. Solder joint contact integrity must be consid-ered. Table 4 shows the testing done to characterize the UCSP reliability performance. In conclusion, the UCSP is capable of performing reliably through envi-ronmental stresses as indicated by the results in the table. Additional usage data and recommendations are detailed in the UCSP application note, which can be found on Maxim’s website at .Table 4. Reliability Test DataM A X 3222E /M A X 3232E /M A X 3237E /M A X 3241E †/M A X 3246EUp to 1Mbps, True RS-232 Transceivers__________________________________________________________Pin ConfigurationsMAX3222E/MAX3232E/MAX3237E/MAX3241E †/MAX3246EUp to 1Mbps, True RS-232 TransceiversPin Configurations (continued)M A X 3222E /M A X 3232E /M A X 3237E /M A X 3241E †/M A X 3246EUp to 1Mbps, True RS-232 Transceivers__________________________________________________Typical Operating CircuitsMAX3222E/MAX3232E/MAX3237E/MAX3241E †/MAX3246EUp to 1Mbps, True RS-232 Transceivers_____________________________________Typical Operating Circuits (continued)M A X 3222E /M A X 3232E /M A X 3237E /M A X 3241E †/M A X 3246EUp to 1Mbps, True RS-232 Transceivers_____________________________________Typical Operating Circuits (continued)MAX3222E/MAX3232E/MAX3237E/MAX3241E †/MAX3246EUp to 1Mbps, True RS-232 Transceivers______________________________________________________________________________________21Selector Guide___________________Chip InformationTRANSISTOR COUNT:MAX3222E/MAX3232E: 1129MAX3237E: 2110MAX3241E: 1335MAX3246E: 842PROCESS: BICMOSOrdering Information (continued)†Requires solder temperature profile described in the AbsoluteMaximum Ratings section. UCSP Reliability is integrally linked to the user’s assembly methods, circuit board material, and environment. Refer to the UCSP Reliability Notice in the UCSP Reliability section of this datasheet for more information.**EP = Exposed paddle.。

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MAX1602Single-Channel CardBus and PCMCIA VCC/VPPPower-Switching Network________________________________________________________________Maxim Integrated Products 1For free samples & the latest literature: , or phone 1-800-998-880019-1125; Rev 0; 9/96_______________General DescriptionThe MAX1602 DC power-switching IC contains a net-work of low-resistance MOSFET switches that deliver selectable VCC and VPP voltages to a single CardBus or PC Card host socket. Key features include low-resistance switches, small packaging, soft-switching action, and compliance with PCMCIA specifications for 3V/5V switching. 3.3V-only power switching for fast,32-bit CardBus applications is supported in two ways:low-resistance 3.3V switches allow high 3.3V load cur-rents (up to 1A); and completely independent internal charge pumps let the 3.3V switch operate normally,even if the +5V and +12V supplies are disconnected or turned off to conserve power. The internal charge pumps are regulating types that draw reduced input current when the VCC switches are static. Power con-sumption is automatically reduced to 11µA max when the outputs are high-Z or GND.Other key features include guaranteed specifications for output current limit level, and guaranteed specifi-cations for output rise/fall times (in compliance with PCMCIA specifications). Reliability is enhanced by thermal-overload protection, accurate current limiting,an overcurrent-fault flag output, and undervoltage lock-outs. The CMOS/TTL-logic interface is flexible, and can tolerate logic input levels in excess of the positive sup-ply rail.The MAX1602 fits a complete CardBus/PCMCIA switch into a space-saving, 16-pin QSOP package.________________________ApplicationsData Loggers Handy-Terminals Docking StationsPCMCIA Read/Write Drives____________________________Featureso Supports a Single PC Card/CardBus Socket o 1A, 0.25ΩMax 3.3V VCC Switch 1A, 0.25ΩMax 5V VCC Switcho Soft Switching for Low Inrush Surge Current o Overcurrent Protectiono Overcurrent/Thermal-Fault Flag Output o Thermal Shutdown at T j = +150°C o Independent Internal Charge Pumps o Break-Before-Make Switching Action o 11µA Max Standby Supply Current o 5V and 12V Not Required for Low-R DS(ON)3.3V Switching o Complies with PCMCIA 3V/5V Switching Specifications o Super-Small 16-Pin QSOP Package o Code Compatible with:Cirrus CL-PD67XX Family Databook DB86184Intel 82365SL (industry-standard coding)__________Simplified Block Diagram______________Ordering InformationPin Configuration appears on last page.M A X 1602Power-Switching Network 2_______________________________________________________________________________________ABSOLUTE MAXIMUM RATINGSELECTRICAL CHARACTERISTICS(VY = 3.3V, VX = 5V, 12IN = 12V, T A = 0°C to +85°C, unless otherwise noted. Typical values are at T A = +25°C.)Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.Inputs/Outputs to GND(VX, VY, VCC) (Note 1)..........................................-0.3V, +6V VPP Input/Output to GND(12IN, VPP) (Note 1)............................................-0.3V, +15V Logic Inputs to GND (A0VCC, A1VCC,A0VPP, A1VPP) (Note 1)........................................-0.3V, +6V CODE Input to GND ........................................-0.3V, (VY + 0.3V)VCC Output Current (Note 2)...................................................4A VPP Output Current (Note 2).............................................260mAVCC Short Circuit to GND..........................................Continuous VPP Short Circuit to GND...........................................Continuous Continuous Power Dissipation (T A = +70°C)QSOP (derate 8.3mW/°C above +70°C)....................667mW Operating Temperature RangeMAX1602EEE.................................................-40°C to +85°C Storage Temperature Range.............................-65°C to +160°C Lead Temperature (soldering, 10sec).............................+300°CNote 1:There are no parasitic diodes between any of these pins, so there are no power-up sequencing restrictions (for example,logic input signals can be applied even if all of the supply voltage inputs are grounded).Note 2:VCC and VPP outputs are internally current limited. See the Electrical Characteristics .MAX1602Power-Switching Network_______________________________________________________________________________________3ELECTRICAL CHARACTERISTICS (continued)(VY = 3.3V, VX = 5V, 12IN = 12V, T A = 0°C to +85°C, unless otherwise noted. Typical values are at T A = +25°C.)M A X 1602Power-Switching Network 4_______________________________________________________________________________________ELECTRICAL CHARACTERISTICS(VY = 3.3V, VX = 5V, 12IN = 12V, T A = -40°C to +85°C, unless otherwise noted.)Note 3:Not production tested.Note 4:Thermal limit not active in standby state (all switches programmed to GND or high-Z state).MAX1602Power-Switching Network_______________________________________________________________________________________5C L = 30µF, R L = 25ΩVCC SWITCHING (RISE)500µs/divVCC (V)64250CONTROL INPUT (V)M A X 1602 T O C -01__________________________________________Typical Operating Characteristics(VY = 3.3V, VX = 5V, 12IN = 12V, T A = +25°C, unless otherwise noted.)C L = 33µF, R L = ∞VCC SWITCHING (FALL)64205010ms/divVCC (V)CONTROL INPUT(V)M A X 1602 T O C -03C L = 0.1µF, R L = ∞VPP SWITCHING (RISE)15105050200µs/divVPP(V)CONTROL INPUT(V)M A X 1602 T O C -05C L = 1µF, R L = 25ΩVCC SWITCHING (FALL)20ms/divVCC (V)050246CONTROL INPUT(V)M A X 1602 T O C -04VPP SWITCHING (FALL)151050502ms/divVPP(V)CONTROL INPUT(V)M A X 1602 T O C -06C L = 0.1µF, R L = ∞C L = 1µF, R L = ∞VCC SWITCHING (RISE)321050500µs/divVCC (V)CONTROL INPUT(V)M A X 1602 T O C -02M A X 1602Power-Switching Network 6____________________________________________________________________________________________________________________Typical Operating Characteristics (continued)(VY = 3.3V, VX = 5V, 12IN = 12V, T A = +25°C, unless otherwise noted.)C L = 1µF, R L = 50ΩVPP CURRENT LIMITING10502ms/divVPP (V)M A X 1602 T O C -14R L = 0.1ΩINPUT CURRENT (VPP OUTPUT SHORTED)105020********100µs/divVPP (V)I 12IN (mA)M A X 1600/3 T O C -15C L = 1µF, RESISTIVE OVERLOAD, R L = 1ΩVCC CURRENT LIMITING4202ms/divVCC (V)M A X 1602 T O C -07INPUT CURRENT (VCC OUTPUT SHORTED)1.52.01.00.501ms/divI VY (A)M A X 1602 T O C -08MAX1602Power-Switching Network_______________________________________________________________________________________7_____________________________Typical Operating Characteristics (continued)(VY = 3.3V, VX = 5V, 12IN = 12V, T A = +25°C, unless otherwise noted.)607080901001101201302004006008001000VY ON-RESISTANCE vs. VCC LOAD CURRENTVCC LOAD CURRENT (mA)V X R O N (m Ω)64064565065566066567067568002040608010012012IN ON-RESISTANCEvs. CURRENTM A X 1602-09CURRENT (mA)12I N R O N (m Ω)00101212IN SUPPLY CURRENT vs. INPUT VOLTAGE3INPUT VOLTAGE (V)12I N S U P P L Y C U R R E N T (µA )2468751246500550600650700750800850-40-2002040608010012IN ON-RESISTANCE vs. TEMPERATURETEMPERATURE (°C)12I N R O N (m Ω)056VX SUPPLY CURRENT vs. INPUT VOLTAGE0.3M A X 1602 T O C -11INPUT VOLTAGE (V)V X , V Y S U P P L Y C U R R E N T (µA )12340.70.50.10.20.40.80.90.6504505101520253035400135VY SUPPLY CURRENT vs. INPUT VOLTAGEINPUT VOLTAGE (V)V Y S U P P L Y C U R R E N T (µA )246070809010011012013002004006008001000VX ON-RESISTANCE vs. VCC LOAD CURRENTVCC LOAD CURRENT (mA)V X R O N (m Ω)M A X 1602Power-Switching Network 8_______________________________________________________________________________________Table 1. Standard “Intel” Code (82365SL),CODE = GNDTable 2. “Cirrus” Code, CODE = High (VY)STBY = Standby ModeSTBY = Standby Mode______________________________________________________________Pin Description__________________________________________________________Logic Truth TablesMAX1602Power-Switching Network_______________________________________________________________________________________9_________Logic Truth Tables (cont.)STBY = Standby Mode, X = Don’t CareFigure 1. Detailed Block Diagram_______________Detailed DescriptionThe MAX1602 power-switching IC contains a network of low-resistance MOSFET switches that deliver selectable VCC and VPP voltages to two CardBus or PC Card host socket. Figure 1 is the detailed block diagram.The power-input pins (VY, VX, 12IN) are completely independent, however, power must always be applied to VY for proper operation. Low inrush current is guaran-teed by controlled switch rise times. VCC’s 100µs mini-mum output rise time is 100% tested with a 1µF capacitive load, and VPP’s 1ms minimum rise time is guaranteed with a 0.1µF load. These respective capaci-tive loads are chosen as worst-case card-insertion para-meters. The internal switching control allows VCC and VPP rise times to be controlled, and makes them nearlyFigure 2. Application with Cirrus Logic InterfaceM A X 1602Power-Switching Network 10______________________________________________________________________________________independent of resistive and capacitive loads (see rise-time photos in the Typical Operating Characteristics ).Fall times are a function of loading, and are compensat-ed by internal circuitry.Power savings is automatic: internal charge pumps draw very low current when the VCC switches are static.Standby mode reduces switch supply current to 11µA.Operating ModesThe MAX1602 is compatible with the Cirrus CL-PD67XX, Databook DB86184, and Intel 82365SL PC Card Interface Controllers (PCIC). Four control inputs select the internal switches’ positions and the operating modes according to the input code. Select the proper code format for the chosen controller with the CODE input pin (see Pin Description and Tables 1, 2, and 3).CODE reconfigures the logic decoder to one of three interface controllers:Low = Standard “Intel” code (Figure 3)High = “Cirrus” code (Figure 2)Mid-supply = “Databook” code (Figure 4)An additional 1µA (3µA max) of VY supply current will flow if CODE = mid-supply (VY/2).The MAX1602 has two operating modes: normal and standby. Normal mode supplies the selected outputs with their appropriate supply voltages. Standby mode places all switches at ground, high impedance, or a combination of the two.Overcurrent ProtectionPeak detecting circuitry protects both the VCC and VPP switches against overcurrent conditions. When current through any switch exceeds the internal current limit (4A for VCC switches and 200mA for VPP switches) the switch turns off briefly, then turns on again at the con-trolled rise rate. If the overcurrent condition lasts more than 2µs, the FAULT output goes low. FAULT is not latched. A continuous short-circuit condition results in a pulsed output current and a pulsed FAULT output until thermal shutdown is reached. FAULT is open-drain and requires an external pull-up resistor.Thermal ShutdownIf the IC junction temperature rises above +150°C, the thermal shutdown circuitry opens all switches, including the GND switches, and FAULT is pulled low. When the temperature falls below +130°C, the switches turn on again at the controlled rise rate. If the overcurrent con-dition remains, the part cycles between thermal shut-down and overcurrent.Undervoltage LockoutIf the VX switch input voltage drops below 1.9V, the associated switch turns off and FAULT goes low. For example, if VY is 3.3V and VX is 0V, and if the interface controller selects VY, the VCC output will be 3.3V. If VX is selected, VCC changes to a high-impedance output and FAULT goes low.When a voltage is initially applied to 12IN, it must be greater than 8V to allow the switch to operate.Operation continues until the voltage falls below 2V (the VPP output is high impedance).When VY drops to less than 2.6V, all switches are turned off and the VCC and VPP outputs are high impedance.__________Applications InformationSupply BypassingBypass the VY, VX, and 12IN inputs with ceramic 0.1µF capacitors. Bypass the VCC and VPP outputs with a 0.1µF capacitor for noise reduction and ESD protection.分销商库存信息:MAXIMMAX1602EEE+MAX1602EEE+T。