M41T64 Overview
1 Description The M41T6x is a low-power serial real-time clock (RTC) with a built-in 32.768 kHz oscillator. Eight registers are used for the clock/calendar function and are configured in binary-coded decimal (BCD) format. Further eight registers provide status/control of alarm, 32 kHz output, calibration, and watchdog functions.
M41T64 Key Features
- Serial real-time clock (RTC) with alarm functions
- 400 kHz I²C serial interface
- Memory mapped registers for seconds, minutes, hours, day, date, month, year, and century
- Tenths/hundredths of second register
- 350 nA timekeeping current at 3 V
- Time keeping down to 1.0 V
- 1.3 V to 4.4 V I²C bus operating voltage
- 4.4 V max. VCC suitable for lithium-ion battery operation
- Low operating current of 35 µA (at 400 kHz I²C speed)
- 32 kHz square wave output is on at power-up. Suitable for driving a