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Home » NEWEST Products » New by Manufacturer » NXP Semiconductors » NXP PCF2123 SPI Real Time Clock/Calendar
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NXP PCF2123 SPI Real Time Clock/Calendar

NXP PCF2123 SPI Real Time Clock/Calendar

The NXP PCF2123 SPI Real Time Clock/Calendar is a CMOS 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. Typical applications include time keeping, battery power devices, metering, high duration timers, daily alarms, and low standby power applications.

  • 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

  • Time keeping application
  • Battery powered devices
  • Metering
  • High duration timers
  • Daily alarms
  • Low standby power applications

NXP  PCF2123 RTC Demo Board

The NXP RTC Demo PCF2123 is a reference design for a low power Real Time Clock and LCD solution with an available I2C temperature sensor. The Demo Board is controlled by a simple two-button user interface (MODE and SELECT). The user can edit this code and download to the reprogrammable Flash microcontroller via a 10-pin header included on the board using any external ICP style programmer.

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Block Diagram
  • NXP Semiconductors
  • Semiconductors|Integrated Circuits|IC-Clock & Timer