Components

Maxim Integrated trickle-charge real-time clock chip packaged as a 5-pin breakout module with CR2032 battery holder, managing timekeeping over a 3-wire serial interface (CE, IO, SCLK).

NXP low-power CMOS real-time clock (RTC) and calendar IC providing century flag, programmable alarm, timer, and 32.768 kHz clock output over I2C (0x51) with 0.25 µA backup current.