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

Product Details

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Block Diagram

PCF2131 Block Diagram

PCF2131 Block Diagram
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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 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.

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