M41T60 Datasheet - STMicroelectronics

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