st75185 RS-232 接口驱动、接收芯片
RS232接口与单片机串行通信程序设计
RS232接口与单片机串行通信程序设计/zhaojun_xf/blog/static/3005058020087 27457988/2008单片机的串行口是非常有用的，通过他我们可以把单片机系统的数据传回电脑处理或者接受电脑传过来的数据而进行相应的动作，下面我就给大家介绍上一下电脑的RS-232接口与单片机串行通信程序设计方法，上还有很多这样的文章大家去搜索下。
RS-232简介：在串行通讯时,要求通讯双方都采用一个标准接口,使不同的设备可以方便地连接起来进行通讯.RS-232-C接口(又称EIA RS-232-C)是目前最常用的一种串行通讯接口. ("RS-232-C"中的"-C"只不过表示RS-232的版本,所以与"RS-232"简称是一样的)它是在1970年由美国电子工业协会(EIA)联合贝尔系统,调制解调器厂家及计算机终端生产厂家共同制定的用于串行通讯的标准.它的全名是"数据终端设备(DTE)和数据通讯设备(DCE)之间串行二进制数据交换接口技术标准"该标准规定采用一个25个脚的DB-25连接器,对连接器的每个引脚的信号内容加以规定,还对各种信号的电平加以规定.后来IBM的PC机将RS232简化成了DB-9连接器,从而成为事实标准.而工业控制的RS-232口一般只使用RXD,TXD,GND三条线. 下面，让我们使用S51增强型单片机实验板来开发一个简单的串口通信实验程序，这是一个串口通信综合实验，需要全套餐客户的相关配件配合才能完成。
通过该实验程序，我们可以检测实验板串口的状态，接收计算机发送来的数据，然后再发送回计算机，如果程序中发送和接收窗中显示的字符相同，则说明实验板的串口是良好的，能够正常收发数据，另外单片机接收计算机的控制指令，根据控制指令来控制实验板上的继电器动作。
首先让我们来看看我们做的通讯软件的实际效果。
笔记本常见的芯片 (修改)
红色：代表我见过的紫色：代表我见过加上去的千兆网卡芯片：88E8001、RTL8101L笔记本电脑温度传感器芯片：ADM1032、DS1620、LM26、1、LM 75 76 78 79 LM 75负责CPU温度LM 75负责电压CPU风扇转速及主板温度。
2、S：S5597/5595，内速温控功能。
3、WINBOLD 系列：83781B 温度监控芯片83782B 温度监控芯片83783B 温度监控芯片支持6MA33/66芯片笔记本电脑指纹传感器: AES2501A\笔记本电脑液晶显示器高压驱动芯片：BA9741F、BD9766FV、BD9882F、BD9883FV、MAX1522/MAX1523/MAX1524 、OZ960、L1451、TL5001、笔记本电源管理芯片：(可待换)RT9221---SC1164RT9222---SC1165RT9223---SC1153RT9224---HIP6004BRT9224B---CL6911ERT9224C---HIP6004DRT9227A---HIP6016RT9228---HIP6018BRTL9229---HIP6019BRT9230---HIP6020RT9231---HIP6021RT-9231A---HIP6021ART9238---ISL6524RT9239---HIP6021笔记本待机控制芯片：max1631 TB62501 PMH4 H8笔记本电脑开机控制芯片：BD4175KV、BD4176KVT、IPC47N253、PC87551、TB62506、PC8394T(T43)笔记本电脑I／O芯片：FDC37N97、IT8716FCX、IT8705F 、IT8712F 、IT8712G 、IT8702 、W83627HF 、W8671F 、笔记本电脑CPU散热风扇转速控制芯片：G781、笔记本电脑主板时钟芯片：ICS950810、ICS954302、ICS954310、ICS954309、SLG84420、笔记本电脑系统供电控制芯片：LTC1628、LTC3728L 、MAx1632、MAx1901、MAX1977、MAx8734、SC1403、SC1404、SC2450、SI786LG、笔记本电脑内存供电控制芯片：ISL6224 、ISL6225 、ISL6227、ISL6537、G2996、MAx1540、MAxl541、MAx1623、MAX1644、MAx1809、MAx1844、MAX1992/MAX1993、MAX1858、MAX8505、MAX8632、MAx8743、MAx8794、SC470、SC1485、SC1486/SC1486A 、TPS51117、TPS51124、TPS54610、TPS54672、笔记本电脑CPU供电控制芯片：ADP3181 、ADP3203 ADP3205、ADP3421 、APW7057、IPM6220A 、ISL6217、ISL6223、ISL6262、LTC3716、LTC3735、LTC1709 、MAX1830/MAX1831 、MAx1907、MAx1987、MAx8760、MAx8770、SC1474、SC1476、SC451、SC452、CPU供电芯片：ADP3166、ADP3170、ADP3180、ADP3181、ADP3203、ADO3205、ADP3207、ADP3208、ADP3209、ADP3421、AIC1567ISL6215、ISL6217、ISL6218、ISL6219、ISL6223、ISL6227、ISL6260、ISL6262、LTC1436、LTC1736、LTC1709、LTC3716、LTC3735、MAX1532、MAX1533、MAX1710、MAX1711、MAX1712、MAX1714、MAX1717、MAX1718、MAX1830、MAXl831、MAX1897、MAX1907、MAX1987、MAX1988、MAX798、MAX8760、MAX8770、MAX8771、MAX8774、SC451、SC452、SC1474、SC1476、笔记本电脑充电控制芯片：AAT3680 、BQ24700 、BQ24701 、BQ24702/BQ24703 、DS2770 、LT1505、LTC4008 、MAX1645B 、MAX1736 、MAX745、MAX1873 、MAx8724、MAx8725、MAx8765、MB3887、MB39A126PFV、TL594、TPC8109 东芝 120000 0.9 SOP-8笔记本电池电量检测芯片：BQ2040、BQ2060低压差稳压器：AAT3200、AME8824、AMS1505、AP15912、G9338、LPL1084、MAX8863、MIC5205 、SCl565、SC4215、SI9183、100mA低压差稳压器：LP2951、笔记本主板声卡芯片: ALC200 、ALC201A 、ALC262、ALC655(我的废旧主板) 、ALC658、 ALC660、 ALC86l、ALC880、 ALC883、ALC202、AD1986、CS4205、CS20468、CS20549、Esl92l、PT2353、笔记本主板音频功率放大芯片: AN12943、APA2020/TPA0202、G1420、LM4835、LM4838、LM4882、LM4861 、LM4863、LM4880/LM4881 、LM4911 、MAX9710、MAx9750、MAx9751、MAX9755、MAx9789、MAx9790、TPA0142、TPA0142、TPA0312、TPA6017、音频功放芯片：APA2020、TPA0142、TPA0312、TPA6017、TPA0202、LM4835、LM4838、LM4861、LM4863、LM4880、LM4881、LM4882、LM4911、MAX9710、MAX9750、MAX9751、MAX9755、MAX9789、MAX9790、ESS1980S、8552TS、8542TS、TPA0302、AU8810 、BA7786、AN1294、AN12941、AN12942B、AN12943 G1420、主板声卡芯片: ALC655(我的废旧主板)主板网卡芯片：RTL8201CL主板io芯片：Fintek f71872fCMOS 控制芯片：GD75232主板电源管理芯片：SC6243主板内存供电芯片：AP1250、APW7060 、CM8501/CM8501A 、CM8562 、ISL6520 、NCP5201 、RT9202、RT9214、APW7120、RT9203 、RT9173、RT9218、SC2595、SC2614、SC411、SC2616、主板CPU供电控制芯片：ADP3166 、ADP3170 、ADP3180 、ADP3198、AIC1567 、CS5322 、FAN5019、FAN5090、FAN5056 、HIP6004 、HIP6016 、HIP6017 、HIP6018 、HIP6019 、HIP6020 、HIP6021 、HIP6302 、HIP6301、HIP6521 、ISL6312 、ISL6524 、I ISL6556 、SL6559、ISL6561 、ISL6566、L6711、L6917、NCP5314 、TL494/KA7500/MB3759 、L6714 、LM2637/LM2638 、RC5051、RT8802A、RT9237 、RT9238、RT9246A、RT9241 、RT9243 、RT9245 、RT9248 、SC2643(我的废旧主板)、SC1121S SC1155、SC1189 、SC2422、主板时钟芯片：CS950502、CY28405—2／ICS952606、CY28404C、ICS9248?153、ICS954218、ICS9248?151、ICS9248?39、ICS950202、ICS950208BF、ICS950901、ICS950902 、ICS950908 、ICS952018 、ICS952617 、ICS952643 、ICS954127 、双运算放大器：LM13700M、满摆幅输入／输出运算放大器：MAX4490、四电压比较器：LM324、双路可编程电流LJSB开关：MAx1558、主板供电控制芯片：MAx1626、MAxl627、多通道RS-232线性驱动／接收器：MAX3243 3～5V、主板开机芯片：MS-6、笔记本电脑键盘／电源控制芯片：Pc87570、笔记本电脑I／O控制芯片：PC87591、PC97551、高速差分开关芯片: P131500E、MAX4927\双路电压控制开关：SC338、RS-232接口驱动／接收芯片：ST75185、具有串行接口的1A双插槽PC卡电源开关：TPS2206、TPS2211、主板声卡芯片：CMI9738 、VT1611A、VT1612A、AD1885、AD1888、AD1981、端口限流保护芯片：AAT4280、MIC2545、笔记本电脑供电控制芯片：ADP3168、笔记本电脑电池充/放电控制芯片：ADP3806、笔记本电脑电池电量检测芯片：BQ2040、BQ2060、M61040FP、笔记本电脑电源适配器控制芯片：FAN7601、M51995A、NCP1205、NCP1207、88E8001千兆网卡芯片AD1986主板声卡芯片ADM1032笔记本电脑温度传感器芯片ADP3198主板CPU供电控制芯片ADP3205笔记本电脑CPU供电控制芯片ADP3207笔记本电脑CPU供电控制芯片ADP3806笔记本电脑电池充、放电控制芯片(IBM T43)AES2501A笔记本电脑指纹传感器ALC202主板声卡芯片ALC262笔主板声卡芯片ALC658主板声卡芯片ALC660主板声卡芯片ALC86l主板声卡芯片ALC880主板声卡芯片ALC883主板声卡芯片AME8824低压差稳压器AN12943音频功率放大芯片AP1250主板内存供电芯片AP15912大电流低压差稳压器APW7057笔记本电脑芯片组供电控制芯片BA9741F笔记本电脑液晶显示器高压驱动芯片BD4175KV笔记本电脑开机控制芯片BD9766FV笔记本电脑液晶显示器高压驱动芯片BD9882F笔记本电脑液晶显示器高压驱动芯片BD9883FV笔记本电脑液晶显示器高压驱动芯片CS4205笔记本电脑声卡芯片CS20468笔记本电脑声卡芯片CS20549笔记本电脑声卡芯片CY28405—2／ICS952606主板时钟芯片Esl92l笔记本电脑声卡芯片FAN5019主板CPU供电控制芯片FAN5090主板CPU供电控制芯片FDC37N972笔记本电脑I／O芯片G1420笔记本电脑音频功放芯片G2996笔记本电脑内存供电控制芯片G781笔记本电脑CPU散热风扇转速控制芯片G9338低压差线性稳压控制器ICS950810笔记本电脑主板时钟芯片ICS954302笔记本电脑主板时钟芯片ICS954309笔记本电脑主板时钟芯片ICS954310笔记本电脑主板时钟芯片ISL6227笔记本电脑内存供电控制芯片ISL6262笔记本电脑CPU供电控制芯片ISL6559主板CPU供电控制芯片ISL6566主板CPU供电控制芯片IT8716FCX主板I／O芯片LPL1084低压差稳压器L6711主板CPU供电控制芯片L6917主板CPU供电控制芯片LM13700M双运算放大器LM26笔记本电脑温度传感器LM324四电压比较器LM4835／LM4838笔记本电脑音频功放芯片LM4882笔记本电脑音频功放芯片LP2951 100mA低压差稳压器IPC47N253笔记本电脑开机芯片LTC3716笔记本电脑CPU供电控制芯片LTC3735笔记本电脑cPu供电控制电路MAx1540／MAxl541笔记本电脑内存／芯片组供电控制芯片MAx1558双路可编程电流LJSB开关MAx1623笔记本电脑内存供电电路MAx1626／MAxl627主板供电控制芯片MAx1632笔记本电脑系统供电控制芯片MAx1809笔记本电脑内存供电电路MAx1844笔记本电脑芯片组／显卡供电控制芯片MAx1901笔记本电脑系统供电控制芯片MAx1907笔记本电脑cPu供电控制芯片MAx1987笔记本电脑cPu供电控制芯片MAX3243 3～5V多通道RS-232线性驱动／接收器MAX4490满摆幅输入／输出运算放大器MAX8505笔记本电脑芯片组控制芯片MAX8632笔记本电脑内存供电控制芯片MAx8724笔记本电脑充电控制芯片MAx8725笔记本电脑充电控制芯片MAx8734笔记本电脑系统供电控制芯片MAx8743笔记本电脑显卡／芯片组供电控制芯片MAx8760笔记本电脑cPu供电控制芯片MAx8765笔记本电脑电池充电控制芯片MAx8770笔记本电脑CPU供电控制芯片MAx8794笔记本电脑DDR内存供电控制芯片MAX8863低压差稳压芯片MAX9710笔记本电脑音频功放芯片MAx9750／MAx9751／MAX9755笔记本电脑音频功放芯片MAx9789／MAx9790笔记本电脑音频功放芯片MB3887笔记本电脑充电控制电路MlB39A126PFV笔记本电脑充电控制芯片MS-6主板开机芯片PC87551笔记本电脑控制芯片Pc87570笔记本电脑键盘／电源控制芯片PC87591笔记本电脑I／O控制芯片PC97551笔记本电脑I／O控制芯片P131500E／MAX4927高速差分开关芯片PT2353笔记本电脑音效处理芯片RT8802A主板CPu供电控制芯片RT9202主板DDR内存供电控制芯片RT9214／APW7120芯片组／内存供电控制芯片RT9218芯片组／内存供电控制芯片RT9238主板CPU供电控制芯片RT9246A主板CPU供电控制芯片RTL8101L主板网卡芯片RTL8201CL 主板网卡芯片SC1403笔记本电脑主电源控制芯片SC1404笔记本电脑主电源控制芯片SC1474笔记本电脑芯片组供电控制芯片SC1476笔记本电脑芯片组供电控制芯片SC1485笔记本电脑芯片组供电控制芯片SCl565低压差稳压器SC2450笔记本电脑主电源控制芯片SC2595主板DDR内存供电控制芯片SC2614主板DDR内存供电控制芯片SC2643主板CPU供电控制芯片SC338双路电压控制开关SC411主板芯片组供电控制芯片SC4215具有使能功能的低压差稳压器SC451笔记本电脑CPU供电控制芯片SC452笔记本电脑CPU供电控制芯片SC470笔记本电脑显卡供电控制芯片SI786LG笔记本电脑供电控制芯片SI9183低压差稳压器SLG84420笔记本电脑主板时钟芯片ST75185 RS-232接口驱动／接收芯片TB62506笔记本电脑开机控制芯片TL1451笔记本电脑液晶屏高压驱动控制芯片TL5001笔记本电脑液晶屏高压驱动控制芯片TL594-笔记本电脑充电控制芯片TPA0142笔记本电脑音频功放芯片TPA0312笔记本电脑音频功放芯片TPA6017笔记本电脑音频功放芯片TPC8010(T43)TPS2206具有串行接口的1A双插槽PC卡电源开关TPS2211具有并行接口的1A单槽位PC卡电源开关TPS51117笔记本电脑供电控制芯片TPS51124笔记本电脑芯片组供电控制芯片TPS51120笔记本电源管理芯片TPS54610笔记本电脑内存供电控制芯片VT1611A主板声卡芯片VT1612A主板声卡芯片AAT3200 低压差稳压器AAT3680 笔记本电脑充电控制芯片AAT4280 端口限流保护芯片AD1885 主板声卡芯片AD1888 主板声卡芯片AD1981 主板声卡芯片ADP3160/ADP3167 笔记本电脑供电控制芯片ADP3166 主板CPU供电控制芯片ADP3168 笔记本电脑供电控制芯片ADP3170 主板CPU供电控制芯片ADP3180 主板CPU供电控制芯片ADP3181 笔记本电脑CPU供电芯片ADP3203 笔记本电脑CPU供电芯片ADP3421 笔记本电脑CPU供电芯片ADP3806 笔记本电脑电池充/放电控制芯片AIC1567 主板CPU供电控制芯片ALC200 主板声卡芯片ALC201A 主板声卡芯片ALC655 主板声卡芯片AMS1505 低压差稳压器APA2020/TPA0202 小功率音频功率放大芯片APW7060 主板供电控制芯片BQ2040 笔记本电脑电池电量检测芯片BQ2060 笔记本电脑电池电量检测芯片BQ24700 笔记本电脑充电控制芯片BQ24701 笔记本电脑充电控制芯片BQ24702/BQ24703 笔记本电脑充电控制芯片CM8501/CM8501A 主板内存供电控制芯片CM8562 主板内存供电控制芯片CMI9738 主板声卡芯片CS5322 主板CPU供电控制芯片CS950502 主板时钟芯片CY28404C 主板时钟芯片DS1620 笔记本电脑数字温度控制芯片DS2770 笔记本电脑充电控制芯片FAN5056 主板CPU供电控制芯片FAN7601 笔记本电脑电源适配器控制芯片HIP6004 主板CPU供电控制芯片HIP6016 主板CPU供电控制芯片HIP6017 主板CPU供电控制芯片HIP6018 主板CPU供电控制芯片HIP6019 主板CPU供电控制芯片HIP6020 主板CPU供电控制芯片HIP6021 主板CPU供电控制芯片HIP6301 主板CPU供电控制芯片HIP6302 主板CPU供电控制芯片HIP6303 主板CPU供电控制芯片HIP6521 主板供电控制芯片ICS9248?153 主板时钟芯片ICS954218 主板时钟芯片ICS9248?151 主板时钟芯片ICS9248?39 主板时钟芯片ICS950202 主板时钟芯片ICS950208BF 主板时钟芯片ICS950901 主板时钟芯片ICS950902 主板时钟芯片ICS950908 主板时钟芯片ICS952018 主板时钟芯片ICS952617 主板时钟芯片ICS952643 主板时钟芯片ICS954127 主板时钟芯片IPM6220A 笔记本电脑电源管理芯片ISL6223 笔记本电脑CPU供电控制芯片ISL6224 笔记本电脑内存供电控制芯片ISL6225 笔记本电脑内存供电控制芯片ISL6312 主板CPU供电控制芯片ISL6520 主板DDR内存供电控制芯片ISL6524 主板CPU供电控制芯片ISL6537 主板DDR内存供电控制芯片ISL6556 主板CPU供电控制芯片ISL6561 主板CPU供电控制芯片IT8705F 主板I/O芯片IT8712F 主板I/O芯片IT8712G 主板I/O芯片IT8702 主板I/O芯片TL494/KA7500/MB3759 主板CPU供电控制芯片L6714 主板CPU供电控制芯片LM2637/LM2638 主板CPU供电控制芯片LM4861 小功率音频功率放大芯片LM4863 小功率音频功率放大芯片LM4880/LM4881 小功率音频功率放大芯片LM4911 小功率音频功率放大芯片LT1505 笔记本电脑充电控制芯片LTC1628 笔记本电脑系统供电电路LTC1709 笔记本电脑CPU供电控制芯片LTC3728L 笔记本电脑系统供电控制芯片LTC4008 笔记本电脑充电控制芯片M51995A 笔记本电脑电源适配器控制芯片M61040FP 笔记本电脑电池管理控制芯片MAX1522/MAX1523/MAX1524 笔记本电脑LCD背光电源控制芯片MAX1540/ MAX1541 笔记本电脑供电控制芯片MAX1631 笔记本电脑主电源控制芯片MAX1644 笔记本电脑供电控制芯片MAX1645B 笔记本电脑电池充电管理芯片MAX1710/MAX1711/MAX1712 笔记本电脑CPU内核供电芯片MAX1714 笔记本电脑CPU外核供电控制芯片MAX1715 笔记本电脑CPU供电芯片MAX1717 笔记本电脑CPU供电控制芯片MAX1718 笔记本电脑CPU供电控制芯片MAX1736 笔记本电脑充电控制芯片MAX1772 笔记本电脑充电控制芯片MAX1773 笔记本电脑充电控制芯片MAX1830/MAX1831 笔记本电脑CPU供电控制芯片MAX1845 笔记本电脑CPU内核供电控制芯片MAX1873 笔记本电脑充电控制芯片MAX1902 笔记本电脑系统供电控制芯片MAX1908 笔记本电脑充电控制芯片MAX1909 笔记本电脑充电控制芯片MAX1992/MAX1993 笔记本电脑供电控制芯片MAX1999 笔记本电脑系统供电控制芯片MAX745 笔记本电脑充电控制器MAX785/MAX786 笔记本电脑系统供电控制芯片MAX8794 笔记本电脑DDR内存供电控制芯片MB3878 笔记本电脑充电控制芯片MIC2545 端口限流保护芯片MIC5205 低压差稳压器NCP1205 笔记本电脑电源适配器控制芯片NCP1207 笔记本电脑电源适配器控制芯片NCP5201 主板DDR2内存供电控制芯片NCP5314 主板CPU供电控制芯片OZ960 笔记本电脑液晶屏高压驱动控制芯片RC5051 主板CPU供电控制芯片RT9173 主板供电控制芯片RT9203 主板DDR内存供电控制芯片RT9237 主板CPU供电控制芯片RT9241 主板CPU供电控制芯片RT9243 主板CPU供电控制芯片RT9245 主板CPU供电控制芯片RT9248 主板CPU供电控制芯片SC1155 主板CPU供电控制芯片SC1189 主板CPU供电控制芯片SC1470 笔记本电脑供电控制芯片SC1486/SC1486A 笔记本电脑内存供电芯片SC2422 主板CPU供电控制芯片SC2616 主板DDR2内存供电控制芯片TPS51020 笔记本电脑DDR内存供电控制芯片TPS54672 笔记本电脑内存供电控制芯片W83627HF 主板I/O芯片W8671F 主板I/O芯片。
笔记本常用芯片2.
笔记本芯片千兆网卡芯片:88E8001、RTL8101L\笔记本电脑温度传感器芯片:ADM1032、DS1620、LM26、笔记本电脑指纹传感器: AES2501A\笔记本电脑液晶显示器高压驱动芯片:BA9741F、BD9766FV、BD9882F、BD9883FV、MAX1522/MAX1523/MAX1524 、OZ960、L1451、TL5001、笔记本电脑开机控制芯片:BD4175KV、BD4176KVT、IPC47N253、PC87551、TB62506、笔记本电脑I/O芯片:FDC37N97、IT8716FCX、IT8705F 、IT8712F 、IT8712G 、IT8702 、W83627HF 、W8671F 、笔记本电脑CPU散热风扇转速控制芯片:G781、笔记本电脑主板时钟芯片:ICS950810、ICS954302、ICS954310、ICS954309、SLG84420、笔记本电脑系统供电控制芯片:LTC1628 、LTC3728L 、MAx1632、MAx1901、MAX1977、MAx8734、SC1403、SC1404、SC2450、SI786LG、笔记本电脑内存供电控制芯片:ISL6224 、ISL6225 、ISL6227、ISL6537、G2996、MAx1540、MAxl541、MAx1623、MAX1644、MAx1809、MAx1844、MAX1992/MAX1993、MAX1858、MAX8505、MAX8632、MAx8743、MAx8794、SC470、SC1485、SC1486/SC1486A 、TPS51117、TPS51124、TPS54610、TPS54672、笔记本电脑CPU供电控制芯片:ADP3181 、ADP3203 、ADP3421 、APW7057、IPM6220A 、ISL6217、ISL6223、ISL6262、LTC3716、LTC3735、LTC1709 、MAX1830/MAX1831 、MAx1907、MAx1987、MAx8760、MAx8770、SC1474、SC1476、SC451、SC452、笔记本电脑充电控制芯片:AAT3680 、BQ24700 、BQ24701 、BQ24702/BQ24703 、DS2770 、LT1505、LTC4008 、MAX1645B 、MAX1736 、MAX745、MAX1873 、MAx8724、MAx8725、MAx8765、MB3887、MB39A126PFV、TL594、低压差稳压器:AAT3200、AME8824、AMS1505、AP15912、G9338、LPL1084、MAX8863、MIC5205 、SCl565、SC4215、SI9183、100mA低压差稳压器:LP2951、笔记本主板声卡芯片: ALC200 、ALC201A 、ALC262、ALC655 、ALC658、ALC660、 ALC86l、ALC880、 ALC883、ALC202、AD1986、CS4205、CS20468、CS20549、Esl92l、PT2353、笔记本主板音频功率放大芯片: AN12943、APA2020/TPA0202、G1420、LM4835、LM4838、LM4882、LM4861 、LM4863、LM4880/LM4881 、LM4911 、MAX9710、MAx9750、MAx9751、MAX9755、MAx9789、MAx9790、TPA0142、TPA0142、TPA0312、TPA6017、主板内存供电芯片:AP1250、APW7060 、CM8501/CM8501A 、CM8562 、ISL6520 、NCP5201 、RT9202、RT9214、APW7120、RT9203 、RT9173、RT9218、SC2595、SC2614、SC411、SC2616、主板CPU供电控制芯片:ADP3166 、ADP3170 、ADP3180 、ADP3198、AIC1567 、CS5322 、FAN5019、FAN5090、FAN5056 、HIP6004 、HIP6016 、HIP6017 、HIP6018 、HIP6019 、HIP6020 、HIP6021 、HIP6302 、HIP6301、HIP6521 、ISL6312 、ISL6524 、I ISL6556 、SL6559、ISL6561 、ISL6566、L6711、L6917、NCP5314 、TL494/KA7500/MB3759 、L6714 、LM2637/LM2638 、RC5051、RT8802A、RT9237 、RT9238、RT9246A、RT9241 、RT9243 、RT9245 、RT9248 、SC2643、SC1155 、SC1189 、SC2422、主板时钟芯片:CS950502、CY28405—2/ICS952606、CY28404C、ICS9248?153、ICS954218、ICS9248?151、ICS9248?39、ICS950202、ICS950208BF、ICS950901、ICS950902 、ICS950908 、ICS952018 、ICS952617 、ICS952643 、ICS954127 、双运算放大器:LM13700M、满摆幅输入/输出运算放大器:MAX4490、四电压比较器:LM324、双路可编程电流LJSB开关:MAx1558、主板供电控制芯片:MAx1626、MAxl627、多通道RS-232线性驱动/接收器:MAX3243 3~5V、主板开机芯片:MS-6、笔记本电脑键盘/电源控制芯片:Pc87570、笔记本电脑I/O控制芯片:PC87591、PC97551、高速差分开关芯片: P131500E、MAX4927\双路电压控制开关:SC338、RS-232接口驱动/接收芯片:ST75185、具有串行接口的1A双插槽PC卡电源开关:TPS2206、TPS2211、主板声卡芯片:CMI9738 、VT1611A、VT1612A、AD1885、AD1888、AD1981、端口限流保护芯片:AAT4280、MIC2545、笔记本电脑供电控制芯片:ADP3168、笔记本电脑电池充/放电控制芯片:ADP3806、笔记本电脑电池电量检测芯片:BQ2040、BQ2060、M61040FP、笔记本电脑电源适配器控制芯片:FAN7601、M51995A、NCP1205、NCP1207、88E8001千兆网卡芯片AD1986主板声卡芯片ADM1032笔记本电脑温度传感器芯片ADP3198主板CPU供电控制芯片ADP3205笔记本电脑CPU供电控制芯片ADP3207笔记本电脑CPU供电控制芯片AES2501A笔记本电脑指纹传感器ALC202主板声卡芯片ALC262笔主板声卡芯片ALC658主板声卡芯片ALC660主板声卡芯片ALC86l主板声卡芯片ALC880主板声卡芯片ALC883主板声卡芯片AME8824低压差稳压器AN12943音频功率放大芯片AP1250主板内存供电芯片AP15912大电流低压差稳压器APW7057笔记本电脑芯片组供电控制芯片BA9741F笔记本电脑液晶显示器高压驱动芯片BD4175KV笔记本电脑开机控制芯片BD9766FV笔记本电脑液晶显示器高压驱动芯片BD9882F笔记本电脑液晶显示器高压驱动芯片BD9883FV笔记本电脑液晶显示器高压驱动芯片CS4205笔记本电脑声卡芯片CS20468笔记本电脑声卡芯片CS20549笔记本电脑声卡芯片CY28405—2/ICS952606主板时钟芯片Esl92l笔记本电脑声卡芯片FAN5019主板CPU供电控制芯片FAN5090主板CPU供电控制芯片FDC37N972笔记本电脑I/O芯片G1420笔记本电脑音频功放芯片G2996笔记本电脑内存供电控制芯片G781笔记本电脑CPU散热风扇转速控制芯片G9338低压差线性稳压控制器ICS950810笔记本电脑主板时钟芯片ICS954302笔记本电脑主板时钟芯片ICS954309笔记本电脑主板时钟芯片ICS954310笔记本电脑主板时钟芯片ISL6227笔记本电脑内存供电控制芯片ISL6262笔记本电脑CPU供电控制芯片ISL6559主板CPU供电控制芯片ISL6566主板CPU供电控制芯片IT8716FCX主板I/O芯片LPL1084低压差稳压器L6711主板CPU供电控制芯片L6917主板CPU供电控制芯片LM13700M双运算放大器LM26笔记本电脑温度传感器LM324四电压比较器LM4835/LM4838笔记本电脑音频功放芯片LM4882笔记本电脑音频功放芯片LP2951 100mA低压差稳压器IPC47N253笔记本电脑开机芯片LTC3716笔记本电脑CPU供电控制芯片LTC3735笔记本电脑cPu供电控制电路MAx1540/MAxl541笔记本电脑内存/芯片组供电控制芯片MAx1558双路可编程电流LJSB开关MAx1623笔记本电脑内存供电电路MAx1626/MAxl627主板供电控制芯片MAx1632笔记本电脑系统供电控制芯片MAx1809笔记本电脑内存供电电路MAx1844笔记本电脑芯片组/显卡供电控制芯片MAx1901笔记本电脑系统供电控制芯片MAx1907笔记本电脑cPu供电控制芯片MAx1987笔记本电脑cPu供电控制芯片MAX3243 3~5V多通道RS-232线性驱动/接收器MAX4490满摆幅输入/输出运算放大器MAX8505笔记本电脑芯片组控制芯片MAX8632笔记本电脑内存供电控制芯片MAx8724笔记本电脑充电控制芯片MAx8725笔记本电脑充电控制芯片MAx8734笔记本电脑系统供电控制芯片MAx8743笔记本电脑显卡/芯片组供电控制芯片MAx8760笔记本电脑cPu供电控制芯片MAx8765笔记本电脑电池充电控制芯片MAx8770笔记本电脑CPU供电控制芯片MAx8794笔记本电脑DDR内存供电控制芯片MAX8863低压差稳压芯片MAX9710笔记本电脑音频功放芯片MAx9750/MAx9751/MAX9755笔记本电脑音频功放芯片MAx9789/MAx9790笔记本电脑音频功放芯片MB3887笔记本电脑充电控制电路MlB39A126PFV笔记本电脑充电控制芯片MS-6主板开机芯片PC87551笔记本电脑控制芯片Pc87570笔记本电脑键盘/电源控制芯片PC87591笔记本电脑I/O控制芯片PC97551笔记本电脑I/O控制芯片P131500E/MAX4927高速差分开关芯片PT2353笔记本电脑音效处理芯片RT8802A主板CPu供电控制芯片RT9202主板DDR内存供电控制芯片RT9214/APW7120芯片组/内存供电控制芯片RT9218芯片组/内存供电控制芯片RT9238主板CPU供电控制芯片RT9246A主板CPU供电控制芯片RTL8101L主板网卡芯片SC1403笔记本电脑主电源控制芯片SC1404笔记本电脑主电源控制芯片SC1474笔记本电脑芯片组供电控制芯片SC1476笔记本电脑芯片组供电控制芯片SC1485笔记本电脑芯片组供电控制芯片SCl565低压差稳压器SC2450笔记本电脑主电源控制芯片SC2595主板DDR内存供电控制芯片SC2614主板DDR内存供电控制芯片SC2643主板CPU供电控制芯片SC338双路电压控制开关SC411主板芯片组供电控制芯片SC4215具有使能功能的低压差稳压器SC451笔记本电脑CPU供电控制芯片SC452笔记本电脑CPU供电控制芯片SC470笔记本电脑显卡供电控制芯片SI786LG笔记本电脑供电控制芯片SI9183低压差稳压器SLG84420笔记本电脑主板时钟芯片ST75185 RS-232接口驱动/接收芯片TB62506笔记本电脑开机控制芯片TL1451笔记本电脑液晶屏高压驱动控制芯片TL5001笔记本电脑液晶屏高压驱动控制芯片TL594-笔记本电脑充电控制芯片TPA0142笔记本电脑音频功放芯片TPA0312笔记本电脑音频功放芯片TPA6017笔记本电脑音频功放芯片TPS2206具有串行接口的1A双插槽PC卡电源开关TPS2211具有并行接口的1A单槽位PC卡电源开关TPS51117笔记本电脑供电控制芯片TPS51124笔记本电脑芯片组供电控制芯片TPS54610笔记本电脑内存供电控制芯片VT1611A主板声卡芯片VT1612A主板声卡芯片AAT3200 低压差稳压器AAT3680 笔记本电脑充电控制芯片AAT4280 端口限流保护芯片AD1885 主板声卡芯片AD1888 主板声卡芯片AD1981 主板声卡芯片ADP3160/ADP3167 笔记本电脑供电控制芯片ADP3166 主板CPU供电控制芯片ADP3168 笔记本电脑供电控制芯片ADP3170 主板CPU供电控制芯片ADP3180 主板CPU供电控制芯片ADP3181 笔记本电脑CPU供电芯片ADP3203 笔记本电脑CPU供电芯片ADP3421 笔记本电脑CPU供电芯片ADP3806 笔记本电脑电池充/放电控制芯片AIC1567 主板CPU供电控制芯片ALC200 主板声卡芯片ALC201A 主板声卡芯片ALC655 主板声卡芯片AMS1505 低压差稳压器APA2020/TPA0202 小功率音频功率放大芯片APW7060 主板供电控制芯片BQ2040 笔记本电脑电池电量检测芯片BQ2060 笔记本电脑电池电量检测芯片BQ24700 笔记本电脑充电控制芯片BQ24701 笔记本电脑充电控制芯片BQ24702/BQ24703 笔记本电脑充电控制芯片CM8501/CM8501A 主板内存供电控制芯片CM8562 主板内存供电控制芯片CMI9738 主板声卡芯片CS5322 主板CPU供电控制芯片CS950502 主板时钟芯片CY28404C 主板时钟芯片DS1620 笔记本电脑数字温度控制芯片DS2770 笔记本电脑充电控制芯片FAN5056 主板CPU供电控制芯片FAN7601 笔记本电脑电源适配器控制芯片HIP6004 主板CPU供电控制芯片HIP6016 主板CPU供电控制芯片HIP6017 主板CPU供电控制芯片HIP6018 主板CPU供电控制芯片HIP6020 主板CPU供电控制芯片HIP6021 主板CPU供电控制芯片HIP6301 主板CPU供电控制芯片HIP6302 主板CPU供电控制芯片HIP6303 主板CPU供电控制芯片HIP6521 主板供电控制芯片ICS9248?153 主板时钟芯片ICS954218 主板时钟芯片ICS9248?151 主板时钟芯片ICS9248?39 主板时钟芯片ICS950202 主板时钟芯片ICS950208BF 主板时钟芯片ICS950901 主板时钟芯片ICS950902 主板时钟芯片ICS950908 主板时钟芯片ICS952018 主板时钟芯片ICS952617 主板时钟芯片ICS952643 主板时钟芯片ICS954127 主板时钟芯片IPM6220A 笔记本电脑电源管理芯片ISL6223 笔记本电脑CPU供电控制芯片ISL6224 笔记本电脑内存供电控制芯片ISL6225 笔记本电脑内存供电控制芯片ISL6520 主板DDR内存供电控制芯片ISL6524 主板CPU供电控制芯片ISL6537 主板DDR内存供电控制芯片ISL6556 主板CPU供电控制芯片ISL6561 主板CPU供电控制芯片IT8705F 主板I/O芯片IT8712F 主板I/O芯片IT8712G 主板I/O芯片IT8702 主板I/O芯片TL494/KA7500/MB3759 主板CPU供电控制芯片L6714 主板CPU供电控制芯片LM2637/LM2638 主板CPU供电控制芯片LM4861 小功率音频功率放大芯片LM4863 小功率音频功率放大芯片LM4880/LM4881 小功率音频功率放大芯片LM4911 小功率音频功率放大芯片LT1505 笔记本电脑充电控制芯片LTC1628 笔记本电脑系统供电电路LTC1709 笔记本电脑CPU供电控制芯片LTC3728L 笔记本电脑系统供电控制芯片LTC4008 笔记本电脑充电控制芯片M51995A 笔记本电脑电源适配器控制芯片M61040FP 笔记本电脑电池管理控制芯片MAX1522/MAX1523/MAX1524 笔记本电脑LCD背光电源控制芯片MAX1540/ MAX1541 笔记本电脑供电控制芯片MAX1631 笔记本电脑主电源控制芯片MAX1644 笔记本电脑供电控制芯片MAX1645B 笔记本电脑电池充电管理芯片MAX1710/MAX1711/MAX1712 笔记本电脑CPU内核供电芯片MAX1714 笔记本电脑CPU外核供电控制芯片MAX1715 笔记本电脑CPU供电芯片MAX1717 笔记本电脑CPU供电控制芯片MAX1718 笔记本电脑CPU供电控制芯片MAX1736 笔记本电脑充电控制芯片MAX1772 笔记本电脑充电控制芯片MAX1773 笔记本电脑充电控制芯片MAX1830/MAX1831 笔记本电脑CPU供电控制芯片MAX1845 笔记本电脑CPU内核供电控制芯片MAX1873 笔记本电脑充电控制芯片MAX1902 笔记本电脑系统供电控制芯片MAX1908 笔记本电脑充电控制芯片MAX1909 笔记本电脑充电控制芯片MAX1992/MAX1993 笔记本电脑供电控制芯片MAX1999 笔记本电脑系统供电控制芯片MAX745 笔记本电脑充电控制器MAX785/MAX786 笔记本电脑系统供电控制芯片MAX8794 笔记本电脑 DDR 内存供电控制芯片 MB3878 笔记本电脑充电控制芯片 MIC2545 端口限流保护芯片 MIC5205 低压差稳压器 NCP1205 笔记本电脑电源适配器控制芯片 NCP1207 笔记本电脑电源适配器控制芯片 NCP5201 主板 DDR2 内存供电控制芯片 NCP5314 主板 CPU 供电控制芯片 OZ960 笔记本电脑液晶屏高压驱动控制芯片 RC5051 主板 CPU 供电控制芯片 RT9173 主板供电控制芯片RT9203 主板 DDR 内存供电控制芯片 RT9237 主板 CPU 供电控制芯片 RT9241 主板 CPU 供电控制芯片 RT9243 主板 CPU 供电控制芯片 RT9245 主板 CPU 供电控制芯片 RT9248 主板 CPU 供电控制芯片 SC1155 主板 CPU 供电控制芯片 SC1189 主板 CPU 供电控制芯片 SC1470 笔记本电脑供电控制芯片 SC1486/SC1486A 笔记本电脑内存供电芯片 SC2422 主板 CPU 供电控制芯片 SC2616 主板 DDR2 内存供电控制芯片 TPS51020 笔记本电脑 DDR 内存供电控制芯片TPS54672 笔记本电脑内存供电控制芯片 W83627HF 主板 I/O 芯片。
RS232RS485串口服务器解决方案
一、 技术特点及应用方式 ..................................................................................................................................3
串口服务器可以与其他嵌入式网络设备联合使用。但是两个设备的工作模式必须 匹配。
在串口服务器为 Server 模式时，其他网络设备必须为 Client 模式。
串口服务器为 Client 模式时，其他网络设备必须为 Server 模式 串口服务器为 UDP 广播模式时，其他网络设备必须为 UDP 广播模式。 在与其他网络设备通讯时，建议开启串口服务器的<自适应数据帧>模式，由串口 服务器完成串口数据帧重组，用于消除拆包现象。
在使用 Socket 方式时，请打开 TCP/IP 的 KeepAlive 机制，并将检测超时设 置为 10 秒，这样可以快速检测出网络故障，并做出相应处理。
两个（或多个）串口服务器透明传输
串口服务器 A 设置为 TCP/IP Server 模式，串口服务器 B 设置为 TCP/IP Client， 并将 B 的远程服务器地址设置为 A 的 IP 地址，这 2 个串口服务器就可以实现 透明传输。在 UDP 广播模式下，多个串口服务器的接收端口设置为 A 的发送端 口，A 的接收端口设置为多个串口服务器的发送端口，这样就可以实现串口服 务器的单对多透明传输。 串口服务器与其他嵌入式网络设备联合使用
二、 串口服务器工作模式 ..................................................................................................................................8
ST75185中文资料
SYMBOL VDD RA1 RA2 RA3 DY1 DY2 RA4 DY3 RA5 VSS GND RY5 DA3 RY4 DA2 DA1 RY3 RY2 RY1 VCC
NAME AND FUNCTION Supply Voltage (+12V) First Receiver Input Second Receiver Input Third Receiver Input First Driver Output Second Driver Output FourthReceiver Input Third Driver Output Fifth Receiver Input Supply Voltage (-12V) Ground Fifth Receiver Output Third Driver Input Fourth Receiver Output Second Driver Input First Driver Input Third Receiver Output Second Receiver Output First Receiver Output Supply Voltage (+5V)
standards. These standards are for data interchange between a host computer and peripheral at signalling rates up to 20k-bits/s. The switching speeds of the ST75185 are fast enough to support rates up to 120K-bits/s with lower capacitive loads (shorter cables). Interoperability at the higher signalling rates cannot be assured unless the designer has design control of the cable and the interface circuits at the both ends. For interoperability at signalling rates to 120 K-bits/s, use of EIA/ITA-423-B (ITU v.10) and EIA/ITA-422-B (ITU v.11) standards are recommended.
ST75185CTR中文资料
1/18December 2002sMEETS AND EXCEEDS THEREQUIREMENTS OF EIA/TIA-232-E AND ITUV.28STANDARDsSINGLE CHIP WITH EASY INTERFACE BETWEEN UART AND SERIAL PORT CONNECTOR OF IBM PC/AT TM AND COMPATIBLESsDESIGNED TO SUPPORT DATA RATES UP TO 120KbpssPINOUT COMPATIBLE WITH ST75C185DESCRIPTIONThe ST75185contains three drivers and five receivers.The pinout matches the DB9S connector design in order to decrease the part count,reduce the board space required and allow easy interconnection of the UART and serial port connector of IBM PC/AT TM and compatibles.The bipolar circuits and processing of the ST75185provides a rugged low-cost solution for this function at the expense of quiescent power and external passive components relative to the ST75C185.The ST75185complies with the requirements of the EIA/TIA 232-E and ITU (formally CCITT)v.28standards.These standards are for data interchange between a host computer and peripheral at signalling rates up to 20k-bits/s.The switching speeds of the ST75185are fast enough to support rates up to 120K-bits/s with lower capacitive loads (shorter cables).Interoperability at the higher signalling rates cannot be assured unless the designer has design control of the cable and the interface circuits at the both ends.For interoperability at signalling rates to 120K-bits/s,use of EIA/ITA-423-B (ITU v.10)and EIA/ITA-422-B (ITU v.11)standards are recommended.The ST75185is characterized for operation over the range of 0°C to 70°C.ORDERING CODESType Temperature Range PackageCommentsST75185CTR 0to 70°C TSSOP20(Tape &Reel)2500parts per reelST75185CD 0to 70°C SO-20(Tube)40parts per tube /25tubes per boxST75185CDR 0to 70°C SO-20(Tape &Reel)1000parts per reel ST75185CPR0to 70°CSSOP-20(Tape &Reel)1350parts per reelST75185MULTIPLE RS-232DRIVERS AND RECEIVERSST751852/18PIN CONNECTION IEC LOGIC SYMBOL AND LOGIC DIAGRAMPIN DESCRIPTIONPlN N°SYMBOL NAME AND FUNCTION1V DD Supply Voltage (+12V)2RA1First Receiver Input 3RA2Second Receiver Input 4RA3Third Receiver Input 5DY1First Driver Output 6DY2Second Driver Output 7RA4Fourth Receiver Input 8DY3Third Driver Output 9RA5Fifth Receiver Input 10V SS Supply Voltage (-12V)11GND Ground12RY5Fifth Receiver Ouput 13DA3Third Driver Intput14RY4Fourth Receiver Ouput 15DA2Second Driver Input 16DA1First Driver Input17RY3Third Receiver Ouput 18RY2Second Receiver Output 19RY1First Receiver Output 20V CCSupply Voltage(+5V)ST751853/18ABSOLUTE MAXIMUM RATINGS OVER OPERATING FREE-AIR TEMPERATURE RANGEAbsolute Maximum Ratings are those values beyond which damage to the device may occur.Functional operation under these condition is not implied.NOTE 1:All voltage are with respect to the network ground terminal.DISSIPATION RATING TABLE(*)This is the reverse of the traditional junction-case thermal resistance R tJ-CRECOMMENDED OPERATING CONDITIONSSymbol ParameterValue Unit V DD Supply Voltage (Note 1)15V V SS Supply Voltage (Note 1)-15V V CC Supply Voltage (Note 1)10V V I Input Voltage Range (DRIVER)-15to 7V V I Input Voltage Range (RECEIVER)-30to 30V V O Output Voltage Range (DRIVER)-15to 15V I O Receiver Low Level Output Current 20mAP D Continuous Total Power Dissipation See dissipation Rating TableT A Operating Free-Air Tempereature Range 0to 70°C T stg Storage Temperature Range-65to +150°C T LLead Temperature 1.6mm from case for 10sec260°C Package Power Rating at T A ≤25°C Derating Factor above T A =25°C (*)Power Rating at T A ≤70°C MICROPACKAGE (D)1125mW9.0mW/°C720mWSymbol ParameterMin Max Unit V DD Supply Voltage 7.515V V SS Supply Voltage -7.5-15V V CC Supply Voltage 4.5 5.5V V I Driver Input Voltage 0V CC V I OH High Level Output Current DRIVER -6mA RECEIVER -0.5I OL Low Level Output CurrentDRIVER 6mA RECEIVER16T AOperating Free-Air Tempereature Range70°CST751854/18SUPPLY CURRENTSDRIVER ELECTRICAL CHARACTERISTICS OVER OPERATING FREE-AIR TEMPERATURE RANGE (V DD =9V,V SS =-9V,V CC =5V,unless otherwise specified)NOTE 3:The algebraic convention,where the more positive (less negative)limits designated as maximum,is used in this datasheet for logic levels only (e.g.if -10V is a maximum,the typical value is a more negative voltage).NOTE 4:Output short circuit conditions must maintain the total power dissipation below absolute maximum ratings.NOTE 5:Test conditions are those specified by EIA-232-E and as listed above.Symbol ParameterTest ConditionsValue Unit V DDV SSMin.Typ.Max.I DDSupply Current from V DD9-9No load.All inputs at 1.9V15mA12-121915-15259-9No load.All inputs at 0.8V4.5mA12-125.515-159I SS Supply Current from V SS9-9No load.All inputs at 1.9V-15mA12-12-1915-15-259-9No load.All inputs at 0.8V-3.2mA12-12-3.215-15-3.2I CC Supply Current from V CCNo load.All inputs at 5VV CC =5V30mASymbol ParameterTest ConditionsValueUnit Min.Typ.Max.V OH High Level Output Voltage V IL =0.8V R L =3K Ω(See Figure 1)67.5V V OL Low Level Output Voltage (Note 3)V IH =1.9V R L =3K Ω(See Figure 1)-7.5-6V I IH High Level Input Current V I =5V (See Figure 2)10µA I IL Low Level Input Current V I =0V (See Figure 2)−1.6mA I OS(H)High Level Short Circuit Output Current (Note 4)V IL =0.8V V O =0V (See Figure 1)-4.5−12−19.5mA I OS(L)Low Level Short Circuit Output Current V IH =2VV O =0V (See Figure 1)4.51219.5mA R OOutput ResistanceV DD =V SS =V CC =0V V O =-2to 2V (Note 5)300ΩST751855/18DRIVER SWITCHING CHARACTERISTICS (V DD =12V,V SS =-12V,V CC =5V,T A =25°C)NOTE 6:Measured between -3V and 3V points of output waveform (EIA-232-E conditions),all unused inputs are tied.RECEIVER ELECTRICAL CHARACTERISTICS OVER OPERATING CONDITIONSAll typical values are at TA =25°C,VCC =5V,VDD =9V and VSS=-9VRECEIVER SWITCHING CHARACTERISTICS (V DD =12V,V SS =-12V,V CC =5V T A =25°C)Symbol ParameterTest ConditionsValueUnit Min.Typ.Max.t PLH Propagation Delay Time,Low to High Level Output R L =3to 7K ΩC L =15pF (See Figure 3,4)315500ns t PHL Propagation Delay Time,High to Low Level Output R L =3to 7K ΩC L =15pF (See Figure 3,4)75175ns t TLHTransition Time Low to High Level Output R L =3to 7K ΩC L =15pF (See Figure 3,4)60100ns R L =3to 7K ΩC L =2500pF (Note 6,See Figure 3,4)1.72.5µs t THLTransition Time High to Low Level Output R L =3to 7K ΩC L =15pF (See Figure 3,4)407.5ns R L =3to 7K ΩC L =2500pF (Note 6,See Figure 3,4)1.52.5µsSymbol ParameterTest ConditionsValueUnit Min.Typ.Max.V T+Positive Going Threshold Voltage (See Figure 6)2.2 2.4V V T-Negative Going Threshold Voltage T A =25°C (See Figure 6)0.750.97V V hys Input Hysteresis (V T +-V T -)0.5V V OH High Level Output Voltage I OH =-0.5mA V IH =0.75V 2.645VInputs Open 2.6V OL Low Level Output Voltage V I =3V I OL =10mA 0.20.45V I IH High Level Input Current V I =25V (See Figure 6) 3.68.3mAV I =3V (See Figure 6)0.43I IL Low Level Input Current V I =-25V (See Figure 6)-3.6-8.3mAV I =-3V(See Figure 6)-0.43I OSShort-Circuit Output CurrentV I =0V V O =0V (See Figure 5)-3.4-12mASymbol ParameterTest ConditionsValueUnit Min.Typ.Max.t PLH Propagation Delay Time Low to High Level Output R L =5K ΩC L =50pF (See Figure 6)4001000ns t PHL Propagation Delay Time High to Low Level Output R L =5K ΩC L =50pF (See Figure 6)70150ns t TLH Transition Time Low to High Level Output R L =5K ΩC L =50pF (See Figure 6)200525ns t THLTransition Time High to Low Level Output R L =5K ΩC L =50pF(See Figure 6)2060nsST751856/18APPLICATION CIRCUITSFigure 1:Driver Test Circuit for V OH ,I SO(H)and ISO(L)ST751857/18Figure 2:Driver Test Circuit for I IH and I ILFigure 3:Driver Test CircuitFigure 4:Driver VoltageWaveformsST751858/18Figure 5:Receiver Test Circuit for I OSFigure 6:Receiver Test Circuit for V T ,V OH ,V OLFigure 7:Receiver TestCircuitST751859/18Figure 8:Receiver Voltage WaveformsNOTE A:The pulse generator has the following characteristics:t W =25µs,PRR =20KHz,Z O =50Ω,t r =t f <50ns NOTE B:C L includes probe and jig capacitance.Figure 9:Driver Voltage Transfer CharacteristicsFigure 10:Driver Short Circuit Output Current vs Free-Air Temperature Figure 11:Device Supply Current vs TemperatureFigure 12:Driver Output Current vs OutputVoltageST7518510/18Figure 13:Driver Output Slew Rate vs Load CapacitanceFigure 14:Receiver Threshold vs TemperatureFigure 15:Receiver Threshold vs SupplyVoltageAPPLICATION INFORMATION:DIODES ON POWER SUPPLYDiodes placed in series with the VDD and VSS leads protect the ST75185in the fault condition in which the devices output are shorted to±15V and the power supplies are at low state and providebelow).low-impedance path to ground(see Figure11/18Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics.© The ST logo is a registered trademark of STMicroelectronics© 2002 STMicroelectronics - Printed in Italy - All Rights ReservedSTMicroelectronics GROUP OF COMPANIESAustralia - Brazil - Canada - China - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan - Malaysia - Malta - Morocco Singapore - Spain - Sweden - Switzerland - United Kingdom - United States.© 18/18。
RS232与RS485串行接口转换电路及编程实现
RS232与RS485串行接口转换电路及编程实现RS232和RS485都是串行通信接口，但它们在信号电平、传输距离和通信方式等方面有所不同。
RS232是一种单向通信的接口，常用于连接个人计算机和外部设备，如打印机、调制解调器等，信号电平为正负12V。
而RS485是一种半双工通信的接口，常用于远距离和多点通信，信号电平为正负2-6V。
为了实现RS232与RS485之间的转换，我们需要使用特定的电路和编程实现。
电路设计：1.信号电平转换：由于RS232和RS485的信号电平不同，所以我们需要使用电平转换电路将RS232的正负12V转换为RS485的正负2-6V。
这可以通过使用MAX202芯片来实现。
MAX202芯片是一个双向转换器，可以将RS232信号转换为RS485信号。
2.数据方向控制：RS485是一种半双工通信接口，需要通过数据方向控制线来实现发送和接收的切换。
可以使用一个双四极开关（如74HC4053）来控制数据方向。
其中A路和B路分别连接到RS485的A线和B线上，控制端连接到MCU的IO口。
3.电源供电：RS485通信线需要提供独立的5V供电，可以使用一个稳压芯片（如LM7805）来为RS485提供稳定的电源。
编程实现：1.初始化串口：在MCU上初始化串口，设置波特率、数据位、停止位等参数。
根据不同的MCU，具体的初始化方法会有所不同。
2.设置数据方向：根据发送或接收操作，通过控制IO口的电平来控制数据方向，将数据发送到RS485或从RS485接收数据。
3.发送数据：将要发送的数据写入串口缓冲区，并发送出去。
4.接收数据：通过轮询串口缓冲区检查是否有数据到达，若有数据则读取并进行相关处理。
总结：通过以上电路设计和编程实现，我们可以实现RS232与RS485之间的串行接口转换。
这样可以实现单向通信接口与远距离多点通信接口之间的互联。
在实际应用中，我们需要根据具体的系统需求和MCU的特性进行具体的电路和编程设计。
MAX232EESE RS232接口芯片应用方案-奥伟斯
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CAN收发器:NXP恩智浦CAN收发器 Microchip微芯CAN收发器十.分销产品线:ONSEMI安森美 TI德州仪器 ADI TOSHIBA东芝 AVAGO安华高十一 MCU单片机ABOV现代单片机MC96F系列 Microchip微芯单片机PIC12F PIC16F PIC18F系列 FUJITSU富仕通单片机MB95F系列 STM单片机STM32F STM32L系列 CKS中科芯单片机CKS32F系列 TI单片机MSP430系列 TMS320F系列 NXP单片机LPC系列+5V-Powered, Multichannel RS-232Drivers/ReceiversGeneral Description The MAX220–MAX249 family of line drivers/receivers is intended for all EIA/TIA-232E and V.28/V.24 communica- tions interfaces, particularly applications where ±12V is not available.These parts are especially useful in battery-powered sys- tems, since their low-power shutdown mode reduces power dissipation to less than 5µW. The MAX225, MAX233, MAX235, and MAX245/MAX246/MAX247 use no external components and are recommended for appli- cations where printed circuit board space is critical.Applications Portable ComputersLow-Power ModemsInterface TranslationBattery-Powered RS-232 SystemsMultidrop RS-232 NetworksAutoShutdown and UCSP are trademarks of Maxim Integrated Products, Inc.Next-GenerationDevice Features ♦For Low-Voltage, Integrated ESD Applications MAX3222E/MAX3232E/MAX3237E/MAX3241E/MAX3246E: +3.0V to +5.5V, Low-Power, Up to1Mbps, True RS-232 Transceivers Using Four0.1µF External Capacitors (MAX3246E Availablein a UCSP™ Package)♦For Low-Cost ApplicationsMAX221E: ±15kV ESD-Protected, +5V, 1µA,Single RS-232 Transceiver with AutoShutdown™Ordering Information*Contact factory for dice specifications.Selection TableFor pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at .MAX220–MAX249ABSOLUTE MAXIMUM RATINGS —MAX220/222/232A/233A/242/243Supply Voltage (V CC ) ................................................... V to +6V V+ (Note 1) ................................................ (V CC - 0.3V) to +14V V- (Note 1) .......................................................... +0.3V to +14V Input VoltagesT IN .......................................................................... -0.3V to (V CC - 0.3V) R IN (Except MAX220) .......................................................±30V R IN (MAX220) ..................................................................±25V T OUT (Except MAX220) (Note 2) ......................................±15V T OUT (MAX220) ............................................................. ±13.2V Output Voltages T OUT .................................................................................................... ±15V R OUT ......................................................................0.3V to (V CC + 0.3V) Driver/Receiver Output Short Circuited t o GND ........ Continuous Continuous Power Dissipation (T A = +70°C) 16-Pin Plastic DIP (derate 10.53mW/°C above +70°C)..842mW 18-Pin Plastic DIP (derate 11.11mW/°C above +70°C)..889mW 20-Pin Plastic DIP (derate 8.00mW/°C above +70°C) ..440mW 16-Pin Narrow SO (derate 8.70mW/°C above +70°C) ...696mW 16-Pin Wide SO (derate 9.52mW/°C above +70°C) 762mW 18-Pin Wide SO (derate 9.52mW/°C above +70°C) ..... 762mW 20-Pin Wide SO (derate 10.00mW/°C above +70°C) ... 800mW 20-Pin SSOP (derate 8.00mW/°C above +70°C) ......... 640mW 16-Pin CERDIP (derate 10.00mW/°C above +70°C) .... 800mW 18-Pin CERDIP (derate 10.53mW/°C above +70°C) .... 842mW Operating Temperature RangesMAX2_ _AC_ _, MAX2_ _C_ _ ........................... 0°C to +70°C MAX2_ _AE_ _, MAX2_ _E_ _ ....................... ..-40°C to +85°C MAX2_ _AM_ _, MAX2_ _M_ _ ................... ..-55°C to +125°C Storage Temperature Range .......................... ..-65°C to +160°C Lead Temperature (soldering, 10s) (Note 3) .................. +300°CNote 1: For the MAX220, V+ and V- can have a maximum magnitude of 7V, but their absolute difference cannot exceed 13V. Note 2: Input voltage measured with T OUT in high-impedance state, SHDN or V CC = 0V. Note 3: Maximum reflow temperature for the MAX233A is +225°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.ELECTRICAL CHARACTERISTICS —MAX220/222/232A/233A/242/243(V CC = +5V ±10%, C1–C4 = 0.1µF‚ MAX220, C1 = 0.047µF, C2–C4 = 0.33µF, T A = T MIN to T MAX ‚ unless otherwise noted.)M A X 220–M A X 249ELECTRICAL CHARACTERISTICS—MAX220/222/232A/233A/242/243 (continued) (V CC = +5V ±10%, C1–C4 = 0.1µF‚ MAX220, C1 = 0.047µF, C2–C4 = 0.33µF, T A = T MIN to T MAX‚ unless otherwise noted.)OUT IN MAX220–MAX249ELECTRICAL CHARACTERISTICS —MAX220/222/232A/233A/242/243 (continued)(V CC = +5V ±10%, C1–C4 = 0.1µF‚ MAX220, C1 = 0.047µF, C2–C4 = 0.33µF, T A = T MIN to T MAX ‚ unless otherwise noted.)Typical Operating CharacteristicsMAX220/MAX222/MAX232A/MAX233A/MAX242/MAX24310 8 6 4 2 0 -2 -4 -6 -8 -10OUTPUT VOLTAGE vs. LOAD CURRENTAVAILABLE OUTPUT CURRENTvs. DATA RATE1110987 654+10V+5V +5V 0V 0V-10VMAX222/MAX242ON-TIME EXITING SHUTDOWNEITHER V+ OR V- LOADEDM A X 220–M A X 249O U T P U T V O L T A G E (V )M A X 220-01O U T P U T C U R R E N T (m A )M A X 220-02V +, V - V O L T A G E (V )M A X 220-03510 15 20 251020 30 40 50 60500 s/divLOAD CURRENT (mA)DATA RATE (kbits/sec)ABSOLUTE MAXIMUM RATINGS—MAX223/MAX230–MAX241V CC .................................................................................................. V to +6V V+ .............................................................. (V CC - 0.3V) to +14V V- ......................................................................... +0.3V to -14V Input VoltagesT IN .......................................................................... 0.3V to (V CC + 0.3V) R IN ....................................................................................................... ±30V Output VoltagesT OUT .............................................................. (V+ + 0.3V) to (V- - 0.3V) R OUT ...................................................................... 0.3V to (V CC + 0.3V) Short-Circuit Duration, T OUT .............................................. C ontinuous Continuous Power Dissipation (T A = +70°C)14-Pin Plastic DIP (derate 10.00mW/°C above +70°C) .. 800mW 16-Pin Plastic DIP (derate 10.53mW/°C above +70°C) .. 842mW 20-Pin Plastic DIP (derate 11.11mW/°C above +70°C) .. 889mW 24-Pin Narrow Plastic DIP(derate 13.33mW/°C above +70°C).......... 1.07W 24-Pin Plastic DIP (derate 9.09mW/°C above +70°C) ..... 500mW 16-Pin Wide SO (derate 9.52mW/°C above +70°C) ........ 762mW20-Pin Wide SO (derate 10 00mW/°C above +70°C) ...... 800mW 24-Pin Wide SO (derate 11.76mW/°C above +70°C) ...... 941mW 28-Pin Wide SO (derate 12.50mW/°C above +70°C) ............. 1W 44-Pin Plastic FP (derate 11.11mW/°C above +70°C) .... 889mW 14-Pin CERDIP (derate 9.09mW/°C above +70°C) ......... 727mW 16-Pin CERDIP (derate 10.00mW/°C above +70°C) ....... 800mW 20-Pin CERDIP (derate 11.11mW/°C above +70°C) ....... 889mW 24-Pin Narrow CERDIP(derate 12.50mW/°C above +70°C) ............. 1W 24-Pin Sidebraze (derate 20.0mW/°C above +70°C)......... 1.6W 28-Pin SSOP (derate 9.52mW/°C above +70°C) ........... 762mW Operating Temperature RangesMAX2 _ _ C _ _ ................................................... 0°C to +70°C MAX2 _ _ E _ _ ............................................... ..-40°C to +85°C MAX2 _ _ M _ _ ............................................ ..-55°C to +125°C Storage Temperature Range .......................... ..-65°C to +160°C Lead Temperature (soldering, 10s) (Note 4) ................... +300°CNote 4: Maximum reflow temperature for the MAX233/MAX235 is +225°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.ELECTRICAL CHARACTERISTICS—MAX223/MAX230–MAX241(MAX223/230/232/234/236/237/238/240/241, V CC = +5V ±10; MAX233/MAX235, V CC = 5V ±5%‚ C1–C4 = 1.0µF; MAX231/MAX239, V CC = 5V ±10%; V+ = 7.5V to 13.2V; T A = T MIN to T MAX; unless otherwise noted.)MAX220–MAX249ELECTRICAL CHARACTERISTICS —MAX223/MAX230–MAX241 (continued)(MAX223/230/232/234/236/237/238/240/241, V CC = +5V ±10; MAX233/MAX235, V CC = 5V ±5%‚ C1–C4 = 1.0µF; MAX231/MAX239, V CC = 5V ±10%; V+ = 7.5V to 13.2V; T A = T MIN to T MAX ; unless otherwise noted.)M A X 220–M A X 249Typical Operating CharacteristicsMAX223/MAX230–MAX241TRANSMITTER OUTPUT VOLTAGE (V OH )8.58.0 7.57.0TRANSMITTER OUTPUT VOLTAGE (V OH ) vs. V CC2 TRANSMITTERS LOADED3 TRANS- MITTERS LOADED T A = +25°C C1–C4 = 1μF TRANSMITTER4 TRANSMITTERS LOADS =7.47.27.06.8 6.66.46.2 vs. LOAD CAPACITANCE ATDIFFERENT DATA RATES12.011.010.09.0 8.0 7.06.05.0TRANSMITTER SLEW RATEvs. LOAD CAPACITANCE6.54.5LOADED5.0 3k Ω || 2500pF 5.56.050010001500200025004.05001000150020002500-6.0-6.5-7.0-7.5-8.0-8.5-9.0V CC (V)TRANSMITTER OUTPUT VOLTAGE (V OL ) vs. V CC-6.0-6.2-6.4-6.6 -6.8-7.0-7.2-7.4-7.6LOAD CAPACITANCE (pF)TRANSMITTER OUTPUT VOLTAGE (V OL ) vs. LOAD CAPACITANCE AT DIFFERENT DATA RATES108 6 4 2 0 -2 -4 -6 -8-10LOAD CAPACITANCE (pF)TRANSMITTER OUTPUT VOLTAGE (V+, V-)vs. LOAD CURRENT4.55.0 5.550010001500200025000 5 10 15 20 25 30 35 40 45 50V CC (V)LOAD CAPACITANCE (pF)V+, V - W HEN E XITING S HUTDOWN(1μF CAPACITORS)CURRENT (mA)MAX220-13V+O V-SHDN*500ms/div*SHUTDOWN POLARITY IS REVERSED FOR NON MAX241 PARTS1 TRANSMITTERLOADEDMAX220–MAX249V O L (V )V O H (V )M A X 220-07M A X 220-04V O L (V )V O H (V )M A X 220-08M A X 220-05S L E W R A T E (V /μs )V +, V - (V )M A X 220-06M A X 220-09ABSOLUTE MAXIMUM RATINGS —MAX225/MAX244–MAX249Supply Voltage (V CC ) ................................................... V to +6V Input VoltagesT IN ‚ ENA, ENB, ENR, ENT, ENRA, ENRB, ENTA, ENTB ................................. 0.3V to (V CC + 0.3V) R IN ....................................................................................................... ±25V T OUT (Note 5) ...................................................................±15V R OUT ......................................................................0.3V to (V CC + 0.3V) Short Circuit (one output at a time) T OUT to GND .......................................................... Continuous R OUT to GND ......................................................... ContinuousContinuous Power Dissipation (T A = +70°C) 28-Pin Wide SO (derate 12.50mW/°C above +70°C) ............ 1W 40-Pin Plastic DIP (derate 11.11mW/°C above +70°C) .. 611mW 44-Pin PLCC (derate 13.33mW/°C above +70°C) ........... 1.07W Operating Temperature RangesMAX225C_ _, MAX24_C_ _ ................................. 0°C to +70°C MAX225E_ _, MAX24_E_ _ ............................. ..-40°C to +85°C Storage Temperature Range .......................... ..-65°C to +160°C Lead Temperature (soldering,10s) (Note 6) ....................+300°CNote 5: Input voltage measured with transmitter output in a high-impedance state, shutdown, or V CC = 0V.Note 6: Maximum reflow temperature for the MAX225/MAX245/MAX246/MAX247 is +225°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.ELECTRICAL CHARACTERISTICS —MAX225/MAX244–MAX249(MAX225, V CC = 5.0V ±5%; MAX244–MAX249, V CC = +5.0V ±10%, external capacitors C1–C4 = 1µF; T A = T MIN to T MAX ; unless oth- erwise noted.)M A X 220–M A X 249ELECTRICAL CHARACTERISTICS—MAX225/MAX244–MAX249 (continued)(MAX225, V CC = 5.0V ±5%; MAX244–MAX249, V CC = +5.0V ±10%, external capacitors C1–C4 = 1µF; T A = T MIN to T MAX; unless oth- erwise noted.)Note 7: The 300Ωminimum specification complies with EIA/TIA-232E, but the actual resistance when in shutdown mode or V CC = 0V is 10MΩas is implied by the leakage specification. MAX220–MAX249M A X 220–M A X 249T R A N S M I T T E R S L E W R A T E (V / s )Typical Operating CharacteristicsMAX225/MAX244–MAX249TRANSMITTER SLEW RATE vs. LOAD CAPACITANCE1816 14 12 108 6 421 2 3 4 5 LOAD CAPACITANCE (nF)10 8 6 4 2 0 -2 -4 -6 -8 -10OUTPUT VOLTAGEvs. LOAD CURRENT FOR V+ AND V-5101520253035LOAD CURRENT (mA)9.0 8.58.07.5 7.0 6.56.05.55.0TRANSMITTER OUTPUT VOLTAGE (V+, V-)vs. LOAD CAPACITANCE AT DIFFERENT DATA RATES12345LOAD CAPACITANCE (nF)M A X 220-10O U T P U T V O L T A G E (V )M A X 220-11V +, V (V )M A X 220-12Figure 1. Transmitter Propagation-Delay Timing Figure 2. Receiver Propagation-Delay Timing Figure 3. Receiver-Output Enable and Disable Timing Figure 4. Transmitter-Output Disable Timing MAX220–MAX249Table 1a. MAX245 Control Pin ConfigurationsTable 1c. MAX246 Control Pin ConfigurationsM A X 220–M A X 249MAX220 Array–MAX249Detailed DescriptionThe MAX220–MAX249 contain four sections: dual charge-pump DC-DC voltage converters, RS-232 dri- vers, RS-232 receivers, and receiver and transmitter enable control inputs.Dual Charge-Pump Voltage ConverterThe MAX220–MAX249 have two internal charge-pumps that convert +5V to ±10V (unloaded) for RS-232 driver operation. The first converter uses capacitor C1 to dou- ble the +5V input to +10V on C3 at the V+ output. The second converter uses capacitor C2 to invert +10V to -10V on C4 at the V- output.A small amount of power may be drawn from the +10V (V+) and -10V (V-) outputs to power external circuitry (see the Typical Operating Characteristics section), except on the MAX225 and MAX245–MAX247, where these pins are not available. V+ and V- are not regulated, so the output voltage drops with increasing load current. Do not load V+ and V- to a point that violates the mini- mum ±5V EIA/TIA-232E driver output voltage when sourcing current from V+ and V- to external circuitry.When using the shutdown feature in the MAX222, MAX225, MAX230, MAX235, MAX236, MAX240,MAX241, and MAX245–MAX249, avoid using V+ and V- to power external circuitry. When these parts are shut down, V- falls to 0V, and V+ falls to +5V. For applica- tions where a +10V external supply is applied to the V+ pin (instead of using the internal charge pump to gen- erate +10V), the C1 capacitor must not be installed and the SHDN pin must be tied to V CC . This is because V+ is internally connected to V CC in shutdown mode. RS-232 DriversThe typical driver output voltage swing is ±8V when loaded with a nominal 5k Ω RS-232 receiver and V CC = +5V. Output swing is guaranteed to meet the EIA/TIA- 232E and V.28 specification, which calls for ±5V mini- mum driver output levels under worst-case conditions. These include a minimum 3k Ω load, V CC = +4.5V, and maximum operating temperature. Unloaded driver out- put voltage ranges from (V+ -1.3V) to (V- +0.5V).Input thresholds are both TTL and CMOS compatible. The inputs of unused drivers can be left unconnected since 400k Ω input pull-up resistors to V CC are built in (except for the MAX220). The pull-up resistors force the outputs of unused drivers low because all drivers invert. The internal input pull-up resistors typically source 12µA, except in shutdown mode where the pull-ups are dis- abled. Driver outputs turn off and enter a high-imped- ance state —where leakage current is typically microamperes (maximum 25µA)—when in shutdownmode, in three-state mode, or when device power is removed. Outputs can be driven to ±15V. The power- supply current typically drops to 8µA in shutdown mode. The MAX220 does not have pull-up resistors to force the outputs of the unused drivers low. Connect unused inputs to GND or V CC .The MAX239 has a receiver three-state control line, and the MAX223, MAX225, MAX235, MAX236, MAX240, and MAX241 have both a receiver three-state control line and a low-power shutdown control. Table 2 shows the effects of the shutdown control and receiver three- state control on the receiver outputs.The receiver TTL/CMOS outputs are in a high-imped- ance, three-state mode whenever the three-state enable line is high (for the MAX225/MAX235/MAX236/MAX239– MAX241), and are also high-impedance whenever the shutdown control line is high.When in low-power shutdown mode, the driver outputs are turned off and their leakage current is less than 1µA with the driver output pulled to ground. The driver output leakage remains less than 1µA, even if the transmitter output is backdriven between 0V and (V CC + 6V). Below -0.5V, the transmitter is diode clamped to ground with 1k Ω series impedance. The transmitter is also zener clamped to approximately V CC + 6V, with a series impedance of 1k Ω.The driver output slew rate is limited to less than 30V/µs as required by the EIA/TIA-232E and V.28 specifica- tions. Typical slew rates are 24V/µs unloaded and 10V/µs loaded with 3Ω and 2500pF.RS-232 ReceiversEIA/TIA-232E and V.28 specifications define a voltage level greater than 3V as a logic 0, so all receivers invert. Input thresholds are set at 0.8V and 2.4V, so receivers respond to TTL level inputs as well as EIA/TIA-232E and V.28 levels.The receiver inputs withstand an input overvoltage up to ±25V and provide input terminating resistors withTable 2. Three-State Control of ReceiversM A X 220–M A X 249nominal 5k values. The receivers implement Type 1 interpretation of the fault conditions of V.28 and EIA/TIA-232E.The receiver input hysteresis is typically 0.5V with a guaranteed minimum of 0.2V. This produces clear out- put transitions with slow-moving input signals, even with moderate amounts of noise and ringing. The receiver propagation delay is typically 600ns and is independent of input swing direction.Low-Power Receive Mode The low-power receive-mode feature of the MAX223, MAX242, and MAX245–MAX249 puts the IC into shut- down mode but still allows it to receive information. This is important for applications where systems are periodi- cally awakened to look for activity. Using low-power receive mode, the system can still receive a signal that will activate it on command and prepare it for communi- cation at faster data rates. This operation conserves system power.Negative Threshold—MAX243 The MAX243 is pin compatible with the MAX232A, differ- ing only in that RS-232 cable fault protection is removed on one of the two receiver inputs. This means that control lines such as CTS and RTS can either be driven or left floating without interrupting communication. Different cables are not needed to interface with different pieces of equipment.The input threshold of the receiver without cable fault protection is -0.8V rather than +1.4V. Its output goes positive only if the input is connected to a control line that is actively driven negative. If not driven, it defaults to the 0 or “OK to send” state. Normally‚ the MAX243’s other receiver (+1.4V threshold) is used for the data line (TD or RD)‚ while the negative threshold receiver is con- nected to the control line (DTR‚DTS‚CTS‚ RTS, etc.). Other members of the RS-232 family implement the optional cable fault protection as specified by EIA/TIA- 232E specifications. This means a receiver output goes high whenever its input is driven negative‚ left floating‚ or shorted to ground. The high output tells the serial communications IC to stop sending data. To avoid this‚ the control lines must either be driven or connected with jumpers to an appropriate positive voltage level.Shutdown—MAX222–MAX242On the MAX222‚ MAX235‚ MAX236‚ MAX240‚ andMAX241‚ all receivers are disabled during shutdown.On the MAX223 and MAX242‚ two receivers continue to operate in a reduced power mode when the chip is in shutdown. Under these conditions‚ the propagationdelay increases to about 2.5µs for a high-to-low input transition. When in shutdown, the receiver acts as a CMOS inverter with no hysteresis. The MAX223 andMAX242 also have a receiver output enable input (ENfor the MAX242 and EN for the MAX223) that allows receiver output control independent of SHDN (SHDNfor MAX241). With all other devices‚ SHDN (SHDN forMAX241) also disables the receiver outputs.The MAX225 provides five transmitters and five receivers‚ while the MAX245 provides ten receivers andeight transmitters. Both devices have separate receiverand transmitter-enable controls. The charge pumpsturn off and the devices shut down when a logic high is applied to the ENT input. In this state, the supply cur-rent drops to less than 25µA and the receivers continueto operate in a low-power receive mode. Driver outputsenter a high-impedance state (three-state mode). Onthe MAX225‚ all five receivers are controlled by theENR input. On the MAX245‚ eight of the receiver out-puts are controlled by the ENR input‚while the remain-ing two receivers (RA5 and RB5) are always active.RA1–RA4 and RB1–RB4 are put in a three-state mode when ENR is a logic high.Receiver and Transmitter EnableControl InputsThe MAX225 and MAX245–MAX249 feature transmitterand receiver enable controls.The receivers have three modes of operation: full-speed receive (normal active)‚ three-state (disabled)‚ and low- power receive (enabled receivers continue to functionat lower data rates). The receiver enable inputs controlthe full-speed receive and three-state modes. The transmitters have two modes of operation: full-speed transmit (normal active) and three-state (disabled). The transmitter enable inputs also control the shutdown mode. The device enters shutdown mode when all transmitters are disabled. Enabled receivers function inthe low-power receive mode when in shutdown.MAX220–MAX249Tables 1a –1d define the control states. The MAX244 has no control pins and is not included in these tables. The MAX246 has ten receivers and eight drivers with two control pins, each controlling one side of the device. A logic high at the A-side control input (ENA) causes the four A-side receivers and drivers to go into a three-state mode. Similarly, the B-side control input (ENB) causes the four B-side drivers and receivers to go into a three-state mode. As in the MAX245, one A- side and one B-side receiver (RA5 and RB5) remain active at all times. The entire device is put into shut- down mode when both the A and B sides are disabled (ENA = ENB = +5V).The MAX247 provides nine receivers and eight drivers with four control pins. The ENRA and ENRB receiver enable inputs each control four receiver outputs. The ENTA and ENTB transmitter enable inputs each control four drivers. The ninth receiver (RB5) is always active. The device enters shutdown mode with a logic high on both ENTA and ENTB.The MAX248 provides eight receivers and eight drivers with four control pins. The ENRA and ENRB receiver enable inputs each control four receiver outputs. The ENTA and ENTB transmitter enable inputs control four drivers each. This part does not have an always-active receiver. The device enters shutdown mode and trans- mitters go into a three-state mode with a logic high on both ENTA and ENTB.The MAX249 provides ten receivers and six drivers with four control pins. The ENRA and ENRB receiver enable inputs each control five receiver outputs. The ENTA and ENTB transmitter enable inputs control three dri- vers each. There is no always-active receiver. The device enters shutdown mode and transmitters go into a three-state mode with a logic high on both ENTA and ENTB. In shutdown mode, active receivers operate in a low-power receive mode at data rates up to 20kb/s.Applications InformationFigures 5 through 25 show pin configurations and typi- cal operating circuits. In applications that are sensitive to power-supply noise, V CC should be decoupled to ground with a capacitor of the same value as C1 and C2 connected as close as possible to the device.M A X 220–M A X 2494 (N.C.)(N.C.) EN SHDNTOP VIEWC1+116 V CCV+215 GNDC1-314 T1OUTC2+4MAX22013 R1INC2-5MAX232MAX232A12R1OUTV-611T1INFigure 5. MAX220/MAX232/MAX232A Pin Configuration and Typical Operating CircuitFigure 6. MAX222/MAX242 Pin Configurations and Typical Operating CircuitMAX220–MAX2495k ΩR 3OUT MAX225 FUNCTIONAL DESCRIPTION5 RECEIVERS 5 T RANSMITTERS 2 CONTROL PINS1 RECEIVER ENABLE (ENR)1 TRANSMITTER ENABLE (ENT)PINS (ENR, GND, V CC , T 5OUT) ARE INTERNALLY CONNECTED. CONNECT EITHER OR BOTH EXTERNALLY. T 5OUT I S A SINGLE D RIVER.1 ENR 2ENRGND GND 1314Figure 7. MAX225 Pin Configuration and Typical Operating Circuit9 R 2IN R 2OUT 6 SO 20R 5IN 5k ΩR 5OUT 215k Ω19R 4IN R 4OUT 225k Ω8R 3IN 75k Ω 10T 5OUTR 1IN R 1OUT515 ENT26 16 T 5OUTT 5IN 23 400k Ω17T 4OUT+5VT 4IN24400k Ω22 R 4OUT 21 R 5OUT 20 R 5IN 19 R 4IN 18 T 3OUT 17 T 4OUT 16 T 5OUT 15 T 5OUTR 1IN 10 T 1OUT 11 T 2OUT 12 GND 13 GND 14T 3OUT+5V5 23 T IN 18T 3IN25MAX2255 6 7 8 9 R 1OUT R 2OUT R 3OUT R 3IN R 2IN 400k Ω12T 2OUT+5VT 2IN4400k Ω11T 1OUT+5V28 V CC 27 V CC 26 ENT 25 T 3IN24 T 4IN ENR 1 ENR 2 T 1IN 3 T 2IN 4 T 1IN327 V CC 28 V CC 400k Ω+5V0.1 TOP VIEW+5VM A X 220–M A X 249。
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ＳＴ７５１８５
ＳＴ７５１８５的针脚封装图
～３０Ｖ，输出驱动为±１５Ｖ，低电平时驱动电流为２０ｍＡ。
驱动器和５个接收器。
ＳＴ７５１８５的最大工作电压为１０Ｖ，驱动正电源１５Ｖ，驱动负电源－１５Ｖ，输入电压为－１５ ＳＴ７５１８５是主板中常用的ＲＳ－２３２接口驱动／接收芯片，与ＧＤ７５２３２可以互相代换。
ＳＴ７５１８５内部包含３个
ＭＡＸ１９９２、ＭＡＸ１９９３的各引脚功能引脚号引脚名称引脚功能
1VDD 供电端（+12V）2RA1第1接收输入3RA2第2接收输入
4RA3第3接收输入
5DY1第1驱动输出6DY2第2驱动输出7RA4第4接收输入8DY3第3驱动输出9RA5第5接收输入10VSS 负电压供电端（-12V）11GND 接地端12RY5第5驱动输出13DA3第3驱动输入14RY4第4驱动输出15DA2第2驱动输入16DA1第1驱动输入17RY3第3驱动输出18RY2第2驱动输出19RY1第1驱动输出20
VCC
供电端（+5V）
引脚号引脚名称引脚功能NAX1992MAX1993
11TON 振荡器振荡频率控制端。
接VCC时，频率为200kHz；悬空时，频率为300kHz；接REF 时，频率为450kHz；接AGND时，频率为600kHz
2—N.C.空脚
—2FBLANK 反馈响应时间控制端。
接VCC时为140µs；开路时为90µs；接REF时为40µs；接AGND 时为90µs
33LSAT最大保护电流设定端
44PGOOD POWER GOOD信号输出端
55ILIM输出电流设定端
66REF 2.0V基准电压输出端
7REFIN基准电压输入端（MAX1992）/输出电压设定反馈端（MAX1993）—8OD场效应管源级开路输出端
7—N.C.空脚
8—N.C.空脚
99FB反馈输入端
1010OUT输出电压检测输入端
1111CSP输出过流检测信号正相输入端
1212CSN输出过流检测信号反向输入端
1313SKIP 脉冲跳跃模式控制输入端。
接VCC时为PWM低噪声工作模式；接AGND时为脉冲跳跃模式
1414V+电池电压输入端
1515DH上端MOSFET驱动信号输出端
1616LX内置MOSFET开关管的漏极。
通常作为电感连接端
1717BST自举端
1818DL下端MOSFET驱动信号输出端
1919VDD驱动电路电压输入端
20—PGND功率电流接地端
—20GND接地端
21—AGND模拟电路接地端
—21GATE场效应管栅极开路输出端
2222VCC电源电压输入端
2323SHDN使能控制端。
该脚接高电平时，电路正常工作；该脚接地时，电路关断
2424OVP/UVP 过压、欠压保护设置端。
该引脚接VCC时，过压、欠压保护功能均开启；该引脚悬空时，过压保护功能开启，欠压保护功能关闭；该引脚接REF时，过压保护功能关闭，欠压保护功能开启；该引脚接AGND时，过压、欠压保护功能均关闭
C11μF
= 1.5V = 1.0V F
R1
C1OUT )F
R1 ＭＡＸ１９９２、ＭＡＸ１９９３的典型应用电路图。