PCF2131 | Nano-Power Highly Accurate Real Time Clock | NXP Semiconductors

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Nano-Power Highly Accurate RTC with Integrated Quartz Crystal

PCF2131
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The PCF2131 is a CMOS real time clock (RTC) and calendar with an integrated temperature compensated crystal (Xtal) oscillator (TCXO) and a 32.768 kHz quartz crystal optimized for very high accuracy and ultra-low power consumption. The PCF2131 features:

  • Selectable I²C-bus or SPI-bus interfaces for full flexibility when selecting the associated MCU/MPU
  • Backup battery input and switch-over circuit, allowing the RTC to keep track of the time, even when the main power supply is removed
  • Calendar capabilities to keep tracking of the time from years down to 1/100 seconds
  • Up to 4 timestamp registers, which can be associated to timestamp input in order to register tampering events
  • Up to 2 interrupt outputs to enable/disable systems to reduce the overall current consumption

Block Diagram

PCF2131

PCF2131 Block Diagram
Get diagram PDF

Features

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

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N true 0 PSPPCF2131en 3 Application Note Application Note t789 1 Data Sheet Data Sheet t520 1 Selector Guide Selector Guide t528 1 en_US en_US en Data Sheet Data Sheet 1 1 2.1 English The PCF2131 is a CMOS Real Time Clock (RTC) and calendar with an integrated Temperature Compensated Crystal (Xtal) Oscillator (TCXO) and a 32.768 kHz quartz crystal optimized for very high accuracy and ultra low power consumption. 1621637624086720298137 PSP 1.1 MB None None documents None 1621637624086720298137 /docs/en/data-sheet/PCF2131.pdf 1061559 /docs/en/data-sheet/PCF2131.pdf PCF2131 documents N N 2021-05-21 PCF2131, Nano-Power Highly Accurate RTC with Integrated Quartz Crystal Data Sheet /docs/en/data-sheet/PCF2131.pdf /docs/en/data-sheet/PCF2131.pdf Data Sheet N 980000996212993340 2025-01-27 pdf N en Jan 27, 2025 980000996212993340 Data Sheet Y N PCF2131, Nano-Power Highly Accurate RTC with Integrated Quartz Crystal Data Sheet Application Note Application Note 1 2 1.0 English This application note gives additional information about application and soldering of the PCA2131 and PCF2131 RTCs 1622465593646715203927 PSP 161.0 KB None None documents None 1622465593646715203927 /docs/en/application-note/AN13203.pdf 161033 /docs/en/application-note/AN13203.pdf AN13203 documents N N 2021-05-31 AN13203, Application and soldering information for PCF2131 and PCA2131 RTCs /docs/en/application-note/AN13203.pdf /docs/en/application-note/AN13203.pdf Application Note N 645036621402383989 2024-12-13 pdf N en May 31, 2021 645036621402383989 Application Note Y N AN13203, Application and soldering information for PCF2131 and PCA2131 RTCs Selector Guide Selector Guide 1 3 0 Japanese リアルタイム・クロックセレクターガイド。高精度な計時、長い電池寿命、過酷な環境でのアプリケーションに、NXPの豊富なRTCのポートフォリオからお選びください。 1579625550018748134969ja PSP 1.1 MB None None documents None 1579625550018748134969 /docs/ja/product-selector-guide/RTCSelectorGuideA4.pdf 1111554 /docs/ja/product-selector-guide/RTCSelectorGuideA4.pdf RTCSelectorGuideA4 documents N N 2020-01-21 Real Time Clocks Selector Guide Brochure /docs/ja/product-selector-guide/RTCSelectorGuideA4.pdf /docs/ja/product-selector-guide/RTCSelectorGuideA4.pdf Selector Guide N 553557935274807777 2024-04-12 ja Apr 5, 2023 553557935274807777 Selector Guide Y N リアルタイム・ クロック 5 English Real Time Clocks Selector Guide. For highly accurate time-keeping, long battery life, and rugged environment applications, choose from NXP's extensive portfolio of RTCs. 1579625550018748134969 PSP 1.1 MB None None documents None 1579625550018748134969 /docs/en/product-selector-guide/RTCSelectorGuideA4.pdf 1111554 /docs/en/product-selector-guide/RTCSelectorGuideA4.pdf RTCSelectorGuideA4 documents N N 2020-01-21 Real Time Clocks Selector Guide Brochure /docs/en/product-selector-guide/RTCSelectorGuideA4.pdf /docs/en/product-selector-guide/RTCSelectorGuideA4.pdf Selector Guide N 553557935274807777 2024-04-12 pdf N en Apr 17, 2023 553557935274807777 Selector Guide Y N Real Time Clocks Selector Guide Brochure false 0 PCF2131 downloads en true 1 Y PSP Y Y Application Note 1 /docs/en/application-note/AN13203.pdf 2021-05-31 1622465593646715203927 PSP 2 May 31, 2021 Application Note This application note gives additional information about application and soldering of the PCA2131 and PCF2131 RTCs None /docs/en/application-note/AN13203.pdf English documents 161033 None 645036621402383989 2024-12-13 N /docs/en/application-note/AN13203.pdf AN13203, Application and soldering information for PCF2131 and PCA2131 RTCs /docs/en/application-note/AN13203.pdf documents 645036621402383989 Application Note N en None Y pdf 1.0 N N AN13203, Application and soldering information for PCF2131 and PCA2131 RTCs 161.0 KB AN13203 N 1622465593646715203927 Data Sheet 1 /docs/en/data-sheet/PCF2131.pdf 2021-05-21 1621637624086720298137 PSP 1 Jan 27, 2025 Data Sheet The PCF2131 is a CMOS Real Time Clock (RTC) and calendar with an integrated Temperature Compensated Crystal (Xtal) Oscillator (TCXO) and a 32.768 kHz quartz crystal optimized for very high accuracy and ultra low power consumption. None /docs/en/data-sheet/PCF2131.pdf English documents 1061559 None 980000996212993340 2025-01-27 N /docs/en/data-sheet/PCF2131.pdf PCF2131, Nano-Power Highly Accurate RTC with Integrated Quartz Crystal Data Sheet /docs/en/data-sheet/PCF2131.pdf documents 980000996212993340 Data Sheet N en None Y pdf 2.1 N N PCF2131, Nano-Power Highly Accurate RTC with Integrated Quartz Crystal Data Sheet 1.1 MB PCF2131 N 1621637624086720298137 Selector Guide 1 /docs/en/product-selector-guide/RTCSelectorGuideA4.pdf 2020-01-21 1579625550018748134969 PSP 3 Apr 17, 2023 Selector Guide Real Time Clocks Selector Guide. For highly accurate time-keeping, long battery life, and rugged environment applications, choose from NXP's extensive portfolio of RTCs. None /docs/en/product-selector-guide/RTCSelectorGuideA4.pdf English documents 1111554 None 553557935274807777 2024-04-12 N /docs/en/product-selector-guide/RTCSelectorGuideA4.pdf Real Time Clocks Selector Guide Brochure /docs/en/product-selector-guide/RTCSelectorGuideA4.pdf documents 553557935274807777 Selector Guide N en None Y pdf 5 N N Real Time Clocks Selector Guide Brochure 1.1 MB RTCSelectorGuideA4 N 1579625550018748134969 true Y Products

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  • BSPs and Device Drivers

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

    GITHUBRev 1Apr 12, 20241 KBPCF2131-REAL-TIME-CLOCK-DRIVER-WITH-DEMO-APP-SDK
    Download
  • BSPs and Device Drivers

    PCF2131 Real-Time Clock - Application Code Hub

    MCUXPRESSORev 1Apr 12, 20241 KBPCF2131-REAL-TIME-CLOCK-APPLICATION-CODE-HUB
    Download

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

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