The PCF2123BS/1,512 is a SPI real time Clock or Calendar optimized for low power applications. Data is transferred serially via a serial peripheral interface (SPI-bus) with a maximum data rate of 6.25Mbps. An alarm and timer function is also available providing the possibility to generate a wake-up signal on an interrupt pin. An offset register allows fine tuning of the clock.
Watchdog functionality
Freely programmable timer and alarm with interrupt capability
3 Line SPI-bus with separate, but combinable data input and output
Internal power-on reset
Open-drain interrupt and clock output pins
Programmable offset register for frequency adjustment
