PCF2123TS datasheet(1/63 Pages) NXP

No. de pieza	PCF2123TS

Descripción Electrónicos	SPI Real time clock/calendar Time keeping application

PDF	63 Pages

Scroll/Zoom	100%

Fabricante Electrónico	NXP [NXP Semiconductors]

Página de inicio	http://www.nxp.com

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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 = 2.0 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 =1.6 Vto5.5 V

1 second or 1 minute interrupt output

Integrated oscillator load capacitors for CL =7pF

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

PCF2123

SPI Real time clock/calendar

Rev. 5 — 27 April 2011

Product data sheet

1.

The definition of the abbreviations and acronyms used in this data sheet can be found in Section 21.

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PCF2123TS Datasheet(PDF) 1 Page - NXP Semiconductors

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