NXP's PCF85263A Tiny Real-Time Clock/Calendar is a CMOS Real-Time Clock (RTC) and calendar optimized for low power consumption and with automatic switching to battery on main power loss. The RTC can also be configured as a stop-watch (elapsed time counter). Three time log registers triggered from battery switch-over as well as input driven events. Featuring clock output and two independent interrupt signals, two alarms, I2C interface and quartz crystal calibration. Typical applications include printers, copiers, electronic metering, digital cameras, white goods, elapsed time counter, network powered devices, battery backed up systems, data loggers, digital voice recorders, mobile equipment, and accurate high duration timer.