Description Board Features: High performance and cheap price RTC solution Standby power supply by on board CR2032 battery or pin header Two interrrupt pins INT1 INT2 I2C communication interface, on board pull-up resistors Reserved filter capacitor place for crystal 32Khz, can be used to tune the bias of clock. Chip Features: Ultra-low power consumption (typical value [email protected]) Real-time clock (two timing modes, 12-hour system or 24-hour system) Automatically identify leap years and normal years (2000~2099) Clock count (including hour, minute, second) and perpetual calendar (including leap year, average year, month, day, week) represented by BCD code 30-second digital timing function Controllable 32.768KHz (or 32KHz) output Two programmable alarm output Two programmable square wave outputs, providing a variety of interrupts for the CPU (periodical interrupts from one month to one second) Connect to CPU through I2C two-wire interface (maximum data clock frequency is 100KHz) The latch function of the crystal oscillation stop detection ensures the validity of the clock data 32KHz and 32.768KHz crystal selection High-precision time adjustment circuit to ensure the accuracy of clock travel Ultra-low voltage operation (timing voltage can be as low as 1.8V, communication voltage can be as low as 1.8V) For code please see C library here.
