PCF8564A Real-time Clock/Calendar Datasheet

PCF8564A Key Features

Provides year, month, day, weekday, hours, minutes, and seconds based on a 32.768 kHz quartz crystal
Wide clock operating voltage: 1.0 V to 5.5 V
Low back-up current typical 250 nA at 3.0 V and 25 C
400 kHz two-wire I2C interface (1.8 V to 5.5 V)
Low-voltage detector
Alarm and timer functions
Two integrated oscillator capacitors
Programmable clock output for peripheral devices (32.768 kHz, 1.024 kHz, 32 Hz, and
Internal Power-On Reset (POR)
I2C slave address: read A3h, write A2h