Nano-Power Highly Accurate RTC with Integrated Quartz Crystal

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Block Diagram

PCF2131 Block Diagram

PCF2131 Block Diagram


Nano-Power Device

  • Clock operating voltage from 1.2 V to 5.5 V
  • Supply current of 64 nA @ VDD = 3.3 V (typical)

Highly Accurate Real Timing

  • ±3 ppm from -40 °C to +85 °C (typical)
  • ±8 ppm from -40 °C to +85 °C (worst)

Integrated Quartz Crystal and Oscillator

  • 32.768 kHz quartz crystal
  • Temperature compensated crystal oscillator (TCXO)

Battery Back Up Supported

  • Battery backup input pin and switch-over circuitry
  • Battery backed output voltage
  • Battery low detection function

Timestamp and Interrupt Functionality

  • 4x Time stamp inputs with independent registers
  • 2x Interrupt pin with selectable interrupt source

Multiple Interfaces Supported

  • I2C-bus support (400 kHz fast-mode)
  • SPI-bus (maximum speed 6.5 Mbit/s)

Calendar Capabilities

  • Provide year, month, day, weekday, hours, minutes, seconds and 1/100 seconds
  • Leap year correction

Product Longevity Program

  • This product is included in the NXP Product Longevity Program ensuring a stable supply of products for your embedded designs. The PCF2131TF is included in the 10-year program.

Part numbers include: PCF2131TF.


Quick reference to our documentation types.

3 documents

Design Resources


2 hardware offerings


2 software files

  • BSPs and Device Drivers

    PCF2131 Real-Time Clock Driver with Demo App (SDK)

  • BSPs and Device Drivers

    PCF2131 Real-Time Clock - Application Code Hub

Note: For better experience, software downloads are recommended on desktop.


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