PCF2123U

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PCF2123U 技术参数

PCF2123

SPI Real time clock/calendar

Rev. 01 — 19 November 2008

Product data sheet

1. General description

The PCF2123 is a CMOS real time clock and calendar optimized for low power

applications. Data is transferred serially via a Serial Peripheral Interface bus (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

I Real time clock provides year, month, day, weekday, hours, minutes and seconds

based on a 32.768 kHz quartz crystal

I Low backup current while running: typical 100 nA at V_DD= 2.0 V and T_amb= 25 °C

I Resolution: seconds to years

I Watchdog functionality

I Freely programmable timer and alarm with interrupt capability

I Clock operating voltage: 1.1 V to 5.5 V

I 3 line SPI-bus with separate combinable data input and output

I Serial interface at V_DD= 1.6 V to 5.5 V

I 1 second or 1 minute interrupt output

I Integrated oscillator load capacitors for C_L= 7 pF

I Internal power-on reset

I Open-drain interrupt and clock output pins

I Programmable offset register for frequency adjustment

3. Applications

I Time keeping application

I Battery powered devices

I Metering

I High duration timers

I Daily alarms

I Low standby power applications

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型号	品牌	获取价格	描述	数据表
PCF2123U/10AA	NXP	获取价格	SPI Real time clock/calendar
PCF2123U/10AA/1	NXP	获取价格	IC 1 TIMER(S), REAL TIME CLOCK, UUC12, DIE-12, Timer or RTC
PCF2123U/10AA/1,00	NXP	获取价格	PCF2123 - SPI Real time clock/calendar
PCF2123U/12AA	NXP	获取价格	SPI Real time clock/calendar
PCF2123U/12AA/1,00	NXP	获取价格	PCF2123 - SPI Real time clock/calendar
PCF2123U/12HA/1,00	NXP	获取价格	PCF2123 - SPI Real time clock/calendar
PCF2123U/5GA	NXP	获取价格	IC REAL TIME CLOCK, Timer or RTC
PCF2123U/5GA/1,015	NXP	获取价格	PCF2123 - SPI Real time clock/calendar
PCF2127	NXP	获取价格	Accurate RTC with integrated quartz crystal for industrial applications
PCF2127A	NXP	获取价格	Integrated RTC, TCXO and quartz crystal