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PCF2123 - SPI Real time clock/calendar

Datasheet Summary

Description

The PCF2123 is a CMOS1 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.

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 C.
  • 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 t.

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Datasheet Details

Part number PCF2123
Manufacturer NXP Semiconductors
File Size 839.21 KB
Description SPI Real time clock/calendar
Datasheet download datasheet PCF2123 Datasheet
Additional preview pages of the PCF2123 datasheet.

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PCF2123 SPI Real time clock/calendar Rev. 6 — 15 July 2013 Product data sheet 1. General description The PCF2123 is a CMOS1 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. 2. Features and benefits  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.
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