M41T81M6E [STMicroelectronics]

M41T81M6E Description

The M41T81M6E is a low-power serial 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.

M41T81M6E Features

• For all new designs use M41T81S

• Counters for tenths/hundredths of seconds, seconds, minutes, hours, days, dates, months, years, and century

• 32 KHz crystal oscillator integrating load capacitance (12.5 pF) providing exceptional oscillator stability and high crystal series resistance operation

• Serial interface supports I2C bus (400 kHz protocol)

• Ultra-low battery supply current of 0.6 ?A (typ at 3 V)

• 2.0 to 5.5 V clock operating voltage

• Automatic switchover and deselect circuitry (for 3 V application select M41T81S datasheet)

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

• 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

• ECOPACK® package available

M41T81M6E Applications

• Industrial

• General Uses