Real Time Clock Chip M41T81SM6F YY-MM-DD-dd 2.7V to 5.5V SOIC-8

Features

■ Counters for tenths/hundredths of seconds, seconds, minutes, hours, day, date, month, year, and century

■ 32 KHz crystal oscillator with integrated load capacitance (12.5 pf) which provides exceptional oscillator stability and high crystal series resistance operation)

■ Oscillator stop detection (monitors clock operation)

■ Serial interface supports I2C bus (400 kHz protocol)

■ Ultra-low battery supply current of 0.6 µA (typ)

■ 2.0 to 5.5 V clock operating voltage

■ Automatic switchover and deselect circuitry (fixed reference) which provides full operation in 3.0 V applications)

■ VCC = 2.7 to 5.5 V

■ 2.5 V ≤ VPFD ≤ 2.7 V

■ Power-down time-stamp (HT bit) which allows determination of time elapsed in battery backup

■ Battery low flag

■ Programmable alarm and interrupt function (valid even during battery backup mode)

■ Accurate programmable watchdog timer (from 62.5 ms to 128 s)

■ Software clock calibration (to compensate for crystal deviation due to temperature)

■ Operating temperature of –40 to 85 °C

■ Package options include an 8-lead SOIC or 18-lead embedded crystal SOIC

Description

The M41T81S is a low-power serial real-time clock (RTC) with a built-in 32.768 kHz oscillator (external crystal controlled). Eight bytes of the SRAM are used for the clock/calendar function and are configured in binary-coded decimal (BCD) format. An additional 12 bytes of SRAM provide status/control of alarm, watchdog and square wave functions. Addresses and data are transferred serially via a two line, bidirectional I2C interface. The built-in address register is incremented automatically after each WRITE or READ data byte. The M41T81S has a built-in power sense circuit which detects power failures and automatically switches to the battery supply when a power failure occurs. The energy needed to sustain the clock operations can be supplied by a small lithium button supply when a power failure occurs. Functions available to the user include a non-volatile, time-ofday clock/calendar, alarm interrupts, watchdog timer and programmable square wave output. The eight clock address locations contain the century, year, month, date, day, hour, minute, second and tenths/hundredths of a second in 24-hour BCD format. Corrections for 28, 29 (leap year - valid until year 2100), 30 and 31 day months are made automatically. The M41T81S is supplied in either an 8-pin SOIC or an 18-pin 300 mil SOIC package which includes an embedded 32 KHz crystal. The 18-pin, embedded crystal SOIC requires only a user-supplied battery to provide nonvolatile operation.

Figure 1. Logic diagram

Specifications

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