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Description

The M41T60 is a low power serial RTC with a built-in 32.768 kHz oscillator (external crystal controlled). Eight registers are used for the clock/calendar function and are configured in binary coded decimal (BCD) format. Addresses and data are transferred serially via a twoline bi-directional bus. The built-in address register is increased automatically after each WRITE or READ data byte.

Features

■ Counters for seconds, minutes, hours, day, date, month, years, and century

■ 32 KHz crystal oscillator integrating load capacitance and high crystal series resistance operation

■ Oscillator stop detection monitors clock operation

■ Serial interface supports I2C bus (400 kHz)

■ 350 nA timekeeping current at 3 V

■ Low operating current of 35 μA (at 400 kHz)

■ Timekeeping down to 1.0 V

■ 1.3 V to 4.4 V I2C bus operating voltage

■ Software clock calibration to compensate deviation of crystal due to temperature

■ Software programmable output (OUT)

■ Operating temperature of –40 to 85 °C

■ Automatic leap year compensation

■ Lead-free 16-pin QFN package

■ Li-ion rechargeable operation