DS3232MZ+TRL;DS3232MZ+;中文规格书,Datasheet资料

General DescriptionThe DS3232M is a low-cost, extremely accurate, I 2C real-time clock (RTC) with 236 bytes of battery-backed SRAM. The device incorporates a battery input and maintains accurate timekeeping when main power to the device is interrupted. The integration of the microelec-tromechanical systems (MEMS) resonator enhances the long-term accuracy of the device and reduces the piece-part count in a manufacturing line.The RTC maintains seconds, minutes, hours, day, date, month, and year information. The date at the end of the month is automatically adjusted for months with fewer than 31 days, including corrections for leap year. The clock operates in either the 24-hour or 12-hour format with anAM /PM indicator. Two programmable time-of-day alarms and a 1Hz output are provided. Address and data are transferred serially through an I 2C bidirectional bus. A precision temperature-compensated voltage reference and comparator circuit monitors the status of V CC to detect power failures, to provide a reset output, and to automatically switch to the backup supply when neces-sary. Additionally, the RST pin is monitored as a pushbut-ton input for generating a microprocessor reset. See the Block Diagram for more details.ApplicationsPower Meters Industrial ApplicationsFeaturesS Timekeeping Accuracy ±5ppm (±0.432 Second/Day) from -40N C to +85N C S 236 Bytes of Battery-Backed User SRAM S Battery Backup for Continuous Timekeeping S Low Power ConsumptionS Functionally Compatible to DS3232S Complete Clock Calendar Functionality Including Seconds, Minutes, Hours, Day, Date, Month, and Year with Leap Year Compensation Up to Year 2100S Two Time-of-Day Alarms S 1Hz and 32.768kHz OutputsS Reset Output and Pushbutton Input with Debounce S Fast (400kHz) I 2C-Compatible Serial Bus S +2.3V to +4.5V Supply VoltageS Digital Temp Sensor with ±3N C Accuracy S -40N C to +85N C Temperature Range S 8-Pin SO (150 mils) PackageS Underwriters Laboratories (UL) RecognizedTypical Operating CircuitOrdering Information appears at end of data sheet.Note: Some revisions of this device may incorporate deviations from published specifications known as errata. Multiple revisions of any device may be simultaneously available through various sales channels. For information about device errata, go to: /errata .For related parts and recommended products to use with this part, refer to: /DS3232M.related±5ppm, I 2C Real-Time Clock with SRAMVoltage Range on Any Pin Relative to GND ........-0.3V to +6.0V Operating Temperature Range ..........................-40N C to +85N C Storage Temperature Range ............................-55N C to +125N CLead Temperature (soldering, 10s) ................................+260N CSoldering Temperature (reflow) ......................................+260N CABSOLUTE MAXIMUM RATINGSStresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional opera-tion 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.RECOMMENDED OPERATING CONDITIONS(T A = -40N C to +85N C, unless otherwise noted.) (Note 1)ELECTRICAL CHARACTERISTICS—FREQUENCY AND TIMEKEEPING(V CC or V BAT = +3.3V, T A = -40N C to +85N C, unless otherwise noted. Typical values are at V CC = +3.3V, V BAT = +3.0V, and T A = +25N C, unless otherwise noted.) (Note 1)DC ELECTRICAL CHARACTERISTICS—GENERAL(V CC = +2.3V to +4.5V, T A = -40N C to +85N C, unless otherwise noted. Typical values are at V CC = +3.3V, V BAT = +3.0V, and T A = +25N C, unless otherwise noted.) (Note 1)PARAMETERSYMBOL CONDITIONSMINTYPMAX UNITS 1Hz Frequency Tolerance D f/f OUT Measured over R 10s intervalQ 5ppm 1Hz Frequency Stability vs. V CC VoltageD f/V Q 1ppm/V Timekeeping Accuracy tK A Q 0.432Seconds/Day32kHz Frequency ToleranceD f/f OUTQ 2.5%PARAMETERSYMBOL CONDITIONSMIN TYP MAX UNITS Supply Voltage V CC 2.3 3.3 4.5V V BAT 2.3 3.04.5Logic 1V IH 0.7 x V CC V CC + 0.3V Logic 0V IL-0.30.3 x V CCVPARAMETERSYMBOL CONDITIONSMINTYP MAX UNITS Active Supply Current (I 2C Active)I CCA (Note 2)125250µAStandby Supply Current (I 2C Inactive)I CCS(Notes 2, 3)100175µA±5ppm, I 2C Real-Time Clock with SRAMDC ELECTRICAL CHARACTERISTICS—GENERAL (continued)(V CC = +2.3V to +4.5V, T A = -40N C to +85N C, unless otherwise noted. Typical values are at V CC = +3.3V, V BAT = +3.0V, and T A = +25N C, unless otherwise noted.) (Note 1)DC ELECTRICAL CHARACTERISTICS—V BAT CURRENT CONSUMPTION(V CC = 0V, V BAT = +2.3V to +4.5V, T A = -40N C to +85N C, unless otherwise noted. Typical values are at V CC = 0V, V BAT = +3.0V, and T A = +25N C, unless otherwise noted.) (Note 1)PARAMETERSYMBOL CONDITIONSMINTYP MAX UNITS Temperature Conversion Current (I 2C Inactive)I CCSCONV200350µA Power-Fail Voltage V PF 2.452.5752.70V Logic 0 Output(32KHZ, INT /SQW, SDA)V OL I OL = 3mA 0.4V Logic 0 Output (RST )V OL I OL = 1mA0.4VLogic 1 Output (32KHZ)V OHActive supply > 3.3V, I OH = -1mA 2.0VActive supply > 2.7V, I OH = -0.75mA 2.0Active supply > 2.3V, I OH = -0.14mA2.0Output Leakage(32KHZ, INT /SQW, SDA)I LO -0.1+0.1µA Input Leakage (SCL)I LI -0.1+0.1µA RST I/O Leakage I OL -200+10µA V BAT Leakage I BATLKG T A = +25N C-10025+100nA Temperature Accuracy TEMP ACC V CC or V BAT = +3.3VQ 3N C Temperature Conversion Time t CONV 10ms Pushbutton Debounce PB DB 250ms Reset Active Timet RST 250ms Oscillator Stop Flag (OSF) Delayt OSF(Note 4)25100ms PARAMETERSYMBOL CONDITIONSMINTYP MAX UNITS Active Battery Current (I 2C Active)I BATA (Note 2)2575µA Timekeeping Battery Current (I 2C Inactive)I BATT EN32KHZ = 0, INTCN = 1 (Note 2)1.8 3.0µA Temperature Conversion Current (I 2C Inactive)I BATTC200350µAData Retention Current(Oscillator Stopped and I 2C Inactive)I BATDR T A = +25N C100nA±5ppm, I 2C Real-Time Clock with SRAMNote 1: Limits are 100% tested at T A = +25°C and T A = +85°C. Limits over the operating temperature range and relevant supplyvoltage range are guaranteed by design and characterization. Typical values are not guaranteed.Note 2: Includes the temperature conversion current (averaged).Note 3: Does not include RST leakage if V CC < V PF .Note 4: The parameter t OSF is the period of time the oscillator must be stopped for the OSF flag to be set.Note 5: The state of RST does not affect the I 2C interface or RTC functions.Note 6: Interface timing shown is for fast-mode (400kHz) operation. This device is also backward-compatible with standard modeI 2C timing.Note 7: C B = total capacitance of one bus line in picofarads.Note 8: Guaranteed by design and not 100% production tested.AC ELECTRICAL CHARACTERISTICS—POWER SWITCH(T A = -40N C to +85N C, unless otherwise noted.) (Note 1, Figure 2)AC ELECTRICAL CHARACTERISTICS—I 2C INTERFACE(V CC or V BAT = +2.3V to +4.5V, T A = -40N C to +85N C, unless otherwise noted. Typical values are at V CC = +3.3V, V BAT = +3.0V, and T A = +25N C, unless otherwise noted.) (Notes 1, 6, Figure 1)PARAMETERSYMBOL CONDITIONSMIN TYPMAXUNITS V CC Fall Time, V PFMAX to V PFMINt VCCF 300F s V CC Rise Time, V PFMIN to V PFMAXt VCCR 0F s Recovery at Power-Upt REC(Note 5)250300msPARAMETERSYMBOL CONDITIONSMIN TYPMAX UNITS SCL Clock Frequencyf SCL 0400kHz Bus Free Time Between STOP and START Conditions t BUF 1.3F s Hold Time (Repeated) START Conditiont HD:STA 0.6F s Low Period of SCL t LOW 1.3F s High Period of SCL t HIGH 0.6F s Data Hold Time t HD:DAT 00.9F s Data Set-Up Time t SU:DAT 100ns START Set-Up Time t SU:STA 0.6F s SDA and SCL Rise Time t R (Note 7)20 + 0.1C B 300ns SDA and SCL Fall Time t F (Note 7)20 + 0.1C B 300ns STOP Set-Up Timet SU:STO 0.6F s SDA, SCL Input CapacitanceC BIN(Note 8)10pF±5ppm, I 2C Real-Time Clock with SRAMTiming DiagramsFigure 1. IC TimingFigure 2. Power Switch TimingFigure 3. Pushbutton Reset Timing±5ppm, I 2C Real-Time Clock with SRAMTypical Operating Characteristics(T A = +25°C, unless otherwise noted.)POWER-SUPPLY CURRENT vs. POWER-SUPPLY VOLTAGES U P P L Y C U R R E N T (µA )608010012014016018020040SUPPLY VOLTAGE (V) 4.33.83.32.82.31.01.52.02.5BATTERY CURRENT vs. BATTERY VOLTAGEB A T T E R YC U R R E N T (µA )3.00.5SUPPLY VOLTAGE (V)4.33.83.32.82.3RST OUTPUT VOLTAGE vs. OUTPUT CURRENTOUTPUT CURRENT (mA)O U T P U T V O L T A G E (V )43210.10.20.30.40.50.605INT/SQW OUTPUT VOLTAGE vs. OUTPUT CURRENTOUTPUT CURRENT (mA)O U T P U T V O L T A G E (V )86420.10.20.30.40.50010POWER-SUPPLY CURRENT vs. SCL FREQUENCYSCL FREQUENCY (kHz)S U P P L Y C U R R E N T (µA )300200100809010011012013014015016017070400THERMOMETER ERROR vs. TEMPERATURETEMPERATURE (°C)T H E R M O M E T E R E R R O R (°C )5020-10-4-3-2-1012345-5-4080±5ppm, I 2C Real-Time Clock with SRAMTypical Operating Characteristics (continued)(T A = +25°C, unless otherwise noted.)1Hz FREQUENCY ERROR (MEASURED EVERY SECOND)TIME (SECONDS)F R E Q U E N C Y E R R O R (p p m )-8-6-4-20246810-10302520151051Hz FREQUENCY ERROR (MEASURED EVERY SECOND)TIME (MINUTES)F R E Q U E N C Y E R R O R (p p m )-8-6-4-20246810-100302520151051Hz FREQUENCY ERROR (DELTA FROM T0)TIME (MINUTES)F R E Q U E N C Y E R R O R (p p m )030252015105-4-3-2-1012345-51Hz FREQUENCY ERROR (10s THERMAL UPDATES MEASURED EVERY SECOND)TIME (SECONDS)F R E Q U E N C Y E R R O R (p p m )-8-6-4-20246810-10302520151051Hz FREQUENCY ERROR (1s THERMAL UPDATES MEASURED EVERY SECOND)TIME (SECONDS)F R E Q U E N C Y E R R O R (p p m )-8-6-4-20246810-1030252015105TIMEKEEPING ACCURACY vs. TEMPERATURETEMPERATURE (°C)F R E Q U E N C Y E R O R (p p m )806040200-20-150-100-50050-200-40±5ppm, I 2C Real-Time Clock with SRAMPin ConfigurationPin DescriptionPIN NAME FUNCTION132KHZ32.768KHZ Output (Push-Pull Output, 50% Duty Cycle). If enabled (EN32KHZ = 1), the 32kHz output is active on V CC . If enabled for battery operation (BB32KHZ = 1), the output is also active on V BAT . When disabled, the output is forced low. This pin can be left unconnected if not used.2V CCDC Power Pin for Primary Power Supply. This pin should be decoupled using a 0.1F F to 1.0F F capacitor. Connect to ground if not used.3INT / SQWActive-Low Interrupt or 1Hz Square-Wave Output. This open-drain pin requires an external pullup resistor connected to a supply at 4.5V or less. It can be left open if not used. This multifunction pin is determined by the state of the INTCN bit in the Control register (0Eh). When INTCN is set to logic 0, this pin outputs a 1Hz square wave. When INTCN is set to logic 1, a match between the timekeeping registers and either of the alarm registers activates the INT /SQW pin (if the alarm is enabled). Because the INTCN bit is set to logic 1 when power is first applied, the pin defaults to an interrupt output with alarms disabled.4RSTActive-Low Reset. This pin is an open-drain input/output. It indicates the status of V CC relative to the V PF specification. As V CC falls below V PF , the RST pin is driven low. When V CC exceeds V PF , for t RST , the RST pin is pulled high by the internal pullup resistor. The active-low, open-drain output is combined with a debounced pushbutton input function. This pin can be activated by a pushbutton reset request. It has an internal 50k I (R PU ) nominal value pullup resistor to V CC . No external pullup resistors should be con-nected. If the oscillator is disabled, t REC is bypassed and RST immediately goes high.5GNDGround6VBATBackup Power-Supply Input. When using the device with the V BAT input as the primary power source, this pin should be decoupled using a 0.1F F to 1.0F F low-leakage capacitor. When using the device with the V BAT input as the backup power source, the capacitor is not required. If V BAT is not used, connect to ground. The device is UL recognized to ensure against reverse charging when used with a primary lithium battery. Go to /qa/info/ul for more information.7SDA Serial-Data Input/Output. This pin is the data input/output for the I 2C serial interface. This open-drain pin requires an external pullup resistor. The pullup voltage can be up to 4.5V, regardless of the voltage on V CC .8SCLSerial-Clock Input. This pin is the clock input for the I 2C serial interface and is used to synchronize data movement on the serial interface. The pullup voltage can be up to 4.5V, regardless of the voltage on V CC .±5ppm, I2C Real-Time Clock with SRAMDetailed Description The DS3232M is a serial real-time clock (RTC) driven by an internal, temperature-compensated, microelectrome-chanical systems (MEMS) resonator. The oscillator pro-vides a stable and accurate reference clock and main-tains the RTC to within Q0.432 seconds-per-day accu-racy from -40N C to +85N C. The RTC is a low-power clock/ calendar with two programmable time-of-day alarms. INT/ SQW provides either an interrupt signal due to alarm conditions or a 1Hz square wave. The clock/calendar provides seconds, minutes, hours, day, date, month, and year information. The date at the end of the month is auto-matically adjusted for months with fewer than 31 days, including corrections for leap year. The clock operates in either the 24-hour or 12-hour format with an AM/PM indi-cator. The internal registers are accessible though an I2C bus interface. A temperature-compensated voltage refer-ence and comparator circuit monitors the level of V CC to detect power failures and to automatically switch to the backup supply when necessary. The RST pin provides an external pushbutton function and acts as an indica-tor of a power-fail event. Also available are 236 bytes of general-purpose battery-backed SRAM.Operation The Block Diagram shows the device’s main elements. Each of the major blocks is described separately in the following sections.Block Diagram±5ppm, I 2C Real-Time Clock with SRAMHigh-Accuracy Time BaseThe temperature sensor, oscillator, and digital adjust-ment controller logic form the highly accurate time base. The controller reads the output of the on-board tempera-ture sensor and adjusts the final 1Hz output to maintain the required accuracy. The device is trimmed at the factory to maintain a tight accuracy over the operating temperature range. When the device is powered by V CC , the adjustment occurs once a second. When the device is powered by V BAT , the adjustment occurs once every 10s to conserve power. Adjusting the 1Hz time base less often does not affect the device’s long-term timekeeping accuracy. The device also contains an Aging Offset reg-ister that allows a constant offset (positive or negative) to be added to the factory-trimmed adjustment value.Power-Supply ConfigurationsThe DS3232M can be configured to operate on a single power supply (using either V CC or V BAT ) or in a dual-supply configuration, which provides a backup supply source to keep the timekeeping circuits alive during absence of primary system power.Figure 4 illustrates a single-supply configuration using V CC only, with the V BAT input grounded. When V CC < V PF , the RST output is asserted (active low). Temperature con-versions are executed once per second.Figure 5 illustrates a single-supply configuration using V BAT only, with the V CC input grounded. The RST output is disabled and is held at ground through the connection of the internal pullup resistor. Temperature conversions are executed once every 10s.Figure 6 illustrates a dual-supply configuration, using the V CC supply for normal system operation and the V BAT supply for backup power. In this configuration, the power-selection function is provided by a temperature-compensated voltage reference and a comparator circuit that monitors the V CC level. When V CC is greater than V PF , the device is powered by V CC . When V CC is less than V PF but greater than V BAT , the device is powered by V CC . If V CC is less than V PF and is less than V BAT , the device is powered by V BAT (see Table 1).When V CC < V PF , the RST output is asserted (active low). When V CC is the presently selected power source, temperature conversions are executed once per second. When V BAT is the presently selected power source, tem-perature conversions are executed once every 10s.Figure 4. Single Supply (V CC Only)Figure 5. Single Supply (V BAT Only)Figure 6. Dual Power SupplyV BATV CC+3.3VV BATV CCV BATV CC+3.3V分销商库存信息:MAXIMDS3232MZ+TRL DS3232MZ+。