PCF2123U/10AA/1 查看數據表（PDF） - NXP Semiconductors.
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PCF2123U/10AA/1 Datasheet PDF : 64 Pages
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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 = 2.0 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 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 22.
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