A small alternative to RTC modules with DS3231 and CR2032 battery holder. This module is only about 17 x 43 mm small, and it features Philips / NXP PCF8563 real time clock chip with I2C interface.
– On board socket for CR1220 backup battery
– Power supply voltage 1.0 to 5.5V
– Ultra low power consumption of typical 0.25uA
– Programmable clock output 32.768KHz, 1024Hz, 32Hz, 1Hz
– Calendar, Timer and Alarm Function
– I2C address A3h (read) and A2h (write)