PCF2123U/10AA/1,00

CMOS 实时时钟/日历

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.

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## 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