PCF212311 查看數據表（PDF） - NXP Semiconductors.

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PCF212311

SPI Real time clock/calendar

NXP Semiconductors. 

PCF2123

SPI Real time clock/calendar

Rev. 5 — 27 April 2011

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 = 2.0 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 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

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.

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