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PCF212HA

Description
SPI Real time clock/calendar Time keeping application
File Size795KB,63 Pages
ManufacturerNXP
Websitehttps://www.nxp.com
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PCF212HA Overview

SPI Real time clock/calendar Time keeping application

PCF2123
SPI Real time clock/calendar
Rev. 5 — 27 April 2011
Product data sheet
1. General description
The PCF2123 is a CMOS
1
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 V
DD
= 2.0 V and T
amb
= 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 V
DD
= 1.6 V to 5.5 V
1 second or 1 minute interrupt output
Integrated oscillator load capacitors for C
L
= 7 pF
Internal Power-On Reset (POR)
Open-drain interrupt and clock output pins
Programmable offset register for frequency adjustment
3. Applications
Time keeping application
Battery powered devices
Metering
High duration timers
Daily alarms
Low standby power applications
1.
The definition of the abbreviations and acronyms used in this data sheet can be found in
Section 21.

PCF212HA Related Products

PCF212HA PCF210AA PCF212AA PCF25GA
Description SPI Real time clock/calendar Time keeping application SPI Real time clock/calendar Time keeping application SPI Real time clock/calendar Time keeping application SPI Real time clock/calendar Time keeping application
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