Overview
●The PCF2123 is a CMOS Real-Time Clock (RTC) and calendar optimized for low power applications. Data is transferred serially via a Serial Peripheral Interface (SPI-bus) with a maximum data rate of 6.25 Mbit/s. 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.
●MoreLess
●## Features
● Real time clock provides year, month, day, weekday, hours, minutes, and seconds based on a 32.768 kHz quartz crystal
● Low backup current while running: typical 100 nA at VDD = 2.0 V and Tamb = 25 ℃
● Resolution: seconds to years
● Watchdog functionality
● Freely programmable timer and alarm with interrupt capability
● Clock operating voltage: 1.1 V to 5.5 V
● 3 line SPI-bus with separate, but combinable data input and output
● Serial interface at VDD = 1.8 V to 5.5 V
● 1 second or 1 minute interrupt output
● Integrated oscillator load capacitors for CL = 7 pF
● Internal Power-On Reset (POR)
● Open-drain interrupt and clock output pins
● Programmable offset register for frequency adjustment
●## Target Applications
● Time keeping application
● Battery powered devices
● Metering
● High duration timers
● Daily alarms
● Low standby power applications
●## Features
