Overview
This module is an I2C bus interface real-time clock that has bult-in 32.768-kHz crystal oscillator. In addition to a calendar (auto leap year, month, day, weekday, hour, minute, second) function and a clock counter function, this module’s real-time clock functions include an alarm function and a fixed-cycle timer interrupt function.

The devices in this module are fabricated via a C-MOS process for low current consumption, which enables long-term battery back-up. All of these many functions are implemented in a compact package, which makes it suitable for various kinds of mobile telephones, handy terminals and other small electronic devices.

FEATURES
‧ Built in frequency adjusted 32.768 kHz crystal unit.
‧ Interface Type : I2C-Bus Interface (400kHz)
‧ Operating voltage range 1.8 : V to 5.5 V
‧ Timekeeper voltage range 1.0 : V to 5.5 V / -20 C to +70C
‧ Low backup current 275 : nA / 3.0V(Typ.)
‧ 32.768 kHz frequency output function : C-MOS output With Control Pin
‧ The various functions include full calendar, alarm, timer, and power supply voltage monitoring function