M41T62
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 seconds register
■ 350 nA timekeeping current at 3 V
■ Timekeeping 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)
■ 32 KHz square wave output is on at power-up.
Suitable for driving a microcontroller in lowpower
mode. Can be disabled.
(M41T62/63/64)
■ Programmable 1 Hz to 32 KHz square wave
output (M41T62/63/64)
■ Programmable alarm with interrupt function
(M41T62/65)
■ 32 KHz crystal oscillator integrates crystal load
capacitors, works with high series resistance
crystals
■ Oscillator stop detection monitors clock
operation
■ Accurate programmable watchdog
– 62.5 ms to 31 min timeout