PDF M41T00S Data sheet ( Hoja de datos )

Número de pieza	M41T00S
Descripción	Serial Access Real-Time Clock
Fabricantes	STMicroelectronics
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No Preview Available ! www.DataSheet4U.com M41T00S Serial Access Real-Time Clock FEATURES SUMMARY ■ 2.0 TO 5.5V CLOCK OPERATING VOLTAGE ■ COUNTERS FOR SECONDS, MINUTES, HOURS, DAY, DATE, MONTH, YEAR, AND CENTURY ■ SOFTWARE CLOCK CALIBRATION ■ AUTOMATIC SWITCH-OVER AND DESELECT CIRCUITRY (FIXED REFERENCE) – VCC = 2.7 to 5.5V 2.5V ≤ VPFD ≤ 2.7V ■ SERIAL INTERFACE SUPPORTS I2C BUS (400kHz PROTOCOL) ■ LOW OPERATING CURRENT OF 300µA ■ OSCILLATOR STOP DETECTION ■ BATTERY OR SUPER-CAP BACK-UP ■ OPERATING TEMPERATURE OF –40 TO 85°C ■ ULTRA-LOW BATTERY SUPPLY CURRENT OF 1µA Figure 1. Packages 8 1 SO8 (M) 8-pin SOIC December 2004 1/23 1 page Figure 4. Block Diagram CRYSTAL 32KHz OSCILLATOR SDA SCL VCC I2C INTERFACE WRITE PROTECT VBAT VSO VPFD COMPARE Note: 1. Open Drain Output REAL TIME CLOCK CALENDAR OSCILLATOR FAIL CIRCUIT RTC & CALIBRATION FT FREQUENCY TEST OUTPUT DRIVER OUT INTERNAL POWER M41T00S FT/OUT(1) AI09168 5/23 5 Page M41T00S CLOCK OPERATION The 8-byte Register Map (see Table 2) is used to both set the clock and to read the date and time from the clock, in a binary coded decimal format. Seconds, Minutes, and Hours are contained within the first three registers. Bits D6 and D7 of Clock Register 02h (Century/ Hours Register) contain the CENTURY ENABLE Bit (CEB) and the CENTURY Bit (CB). Setting CEB to a '1' will cause CB to toggle, either from '0' to '1' or from '1' to '0' at the turn of the century (de- pending upon its initial state). If CEB is set to a '0,' CB will not toggle. Bits D0 through D2 of Register 03h contain the Day (day of week). Registers 04h, 05h, and 06h contain the Date (day of month), Month and Years. The eighth clock register is the Calibration Register (this is described in the Clock Calibration section). Bit D7 of Register 00h con- tains the STOP Bit (ST). Setting this bit to a '1' will cause the oscillator to stop. If the device is expect- ed to spend a significant amount of time on the shelf, the oscillator may be stopped to reduce cur- rent drain. When reset to a '0' the oscillator restarts within one second. The seven Clock Registers may be read one byte at a time, or in a sequential block. The Calibration Register (Address location 07h) may be accessed independently. Provision has been made to as- sure that a clock update does not occur while any of the seven clock addresses are being read. If a clock address is being read, an update of the clock registers will be halted. This will prevent a transi- tion of data during the READ. Clock Registers The M41T00S offers 8 internal registers which contain Clock and Calibration data. These regis- ters are memory locations which contain external (user accessible) and internal copies of the data (usually referred to as BiPORT™ TIMEKEEPER cells). The external copies are independent of in- ternal functions except that they are updated peri- odically by the simultaneous transfer of the incremented internal copy. The internal divider (or clock) chain will be reset upon the completion of a WRITE to any clock address. The system-to-user transfer of clock data will be halted whenever the address being read is a clock address (00h to 06h). The update will resume ei- ther due to a Stop Condition or when the pointer increments to any non-clock address (07h). Clock Registers store data in BCD. The Calibra- tion Register stores data in Binary Format. Table 2. TIMEKEEPER® Register Map Addr D7 D6 D5 D4 00h ST 10 Seconds 01h OF 10 Minutes 02h CEB CB 10 Hours 03h 0 0 0 0 04h 0 0 10 Date 05h 0 0 0 10M 06h 10 Years 07h OUT FT S Keys: 0 = Must be set to '0' CB = Century Bit CEB = Century Enable Bit FT = Frequency Test Bit D3 D2 D1 D0 Seconds Minutes Hours (24 Hour Format) 0 Day of Week Date: Day of Month Month Year Calibration OF = Oscillator Fail Bit OUT = Output level S = Sign Bit ST = Stop Bit Function/Range BCD Format Seconds Minutes Century/ Hours Day Date Month Year Calibration 00-59 00-59 0-1/00-23 01-7 01-31 01-12 00-99 11/23 11 Page

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