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

Data Sheet

Application Notes

Product Details

Block Diagram

PCF2131

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

Product Programs

Product Longevity

Participating products are available for a minimum of 10 years. Designated participating products developed for the automotive, telecom and medical segments are available for a minimum of 15 years.

Buy/Parametrics

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Documentation

Quick reference to our documentation types.

3 documents

Data Sheet
PCF2131, Nano-Power Highly Accurate RTC with Integrated Quartz Crystal Data Sheetupdated

PDFRev 2.1Jan 27, 20251.1 MBPCF2131English
Application Note
AN13203, Application and soldering information for PCF2131 and PCA2131 RTCs

PDFRev 1.0May 31, 2021161.0 KBAN13203English
Selector Guide
Real Time Clocks Selector Guide Brochure

PDFRev 5Apr 17, 20231.1 MBRTCSelectorGuideA4English, 日本語

Design Resources

Design Files

Receive the full breakdown. See the product footprint and more in the eCad file.

Hardware

Quick reference to our board types.

5 hardware offerings

Evaluation and Development Boards
PCF2131/PCA2131 Arduino® Shield Evaluation BoardFeatured

PCF2131-ARD
Complete Solution
NavQPlus AI/ML Companion Computer EVK for Mobile Robotics, ROS, Ground Stations and Camera Heads

8MPNAVQ
Evaluation and Development Boards
FRDM i.MX 93 Development Board

FRDM-IMX93
Reference Design
1500 V Battery Energy Storage Reference Design

RD-BESS1500BUN
Reference Design
S32K358 Battery Management Unit (BMU) for High-Voltage Battery Energy Storage

RD-BESSK358BMU

Software

Quick reference to our software types.

2 software files

BSPs and Device Drivers
PCF2131 Real-Time Clock Driver with Demo App (SDK)

GITHUBRev 1Apr 12, 2024 15:11:001 KBPCF2131-REAL-TIME-CLOCK-DRIVER-WITH-DEMO-APP-SDK

Download
BSPs and Device Drivers
PCF2131 Real-Time Clock - Application Code Hub

MCUXPRESSORev 1Apr 12, 2024 15:29:001 KBPCF2131-REAL-TIME-CLOCK-APPLICATION-CODE-HUB

Download

Nano-Power Highly Accurate RTC with Integrated Quartz Crystal