NXP Semiconductors PCF2131 Nano-Power Highly Accurate RTC

NXP Semiconductors PCF2131 Nano-Power Highly Accurate Real-Time Clock (RTC) features an integrated Temperature Compensated Crystal (Xtal) Oscillator (TCXO) and a 32.768kHz quartz crystal. The PCF2131 is optimized for very high accuracy and ultra-low power consumption. The PCF2131 offers a selectable I2C-bus or SPI-bus, a backup battery switch-over circuit, a programmable watchdog function, four timestamps function, and many other features.

The NXP PCF2131 Nano-Power Highly Accurate RTC has an operating temperature range from -40°C to +85°C in an HLSON 16 package.


  • Operating temperature range from -40°C to +85°C
  • Temperature Compensated Crystal Oscillator (TCXO) with trimmed integrated capacitors
  • Ultra-low supply current of typical 64nA at VDD = 3.3V
  • Temperature-compensated RTC, typical accuracy ±3ppm from -40°C to +85°C
  • Integration of a 32.768kHz quartz crystal and oscillator in the same package
  • Provides year, month, day, weekday, hours, minutes, seconds, and 1/100 seconds
  • Provides leap year correction
  • Timestamp function
    • With interrupt capability
    • Detection of four different events on four input pins (for example, for tamper detection)
  • 2-line bidirectional 400kHz Fast-mode I2C-bus interface
  • 4-line SPI-bus with separate data input and output (maximum speed 6.5Mbit/s)
  • Battery backup input pin and switch-over circuitry
  • Battery backed output voltage
  • Battery low detection function
  • Power-On Reset (POR)
  • Power-On Reset Override (PORO) function
  • Software reset function
  • Two interrupt outputs (open-drain)
  • Programmable 1 second or 1-minute interrupt
  • Programmable watchdog timer with interrupt
  • Programmable alarm function with interrupt capability
  • Programmable square output
  • Clock operating voltage of 1.2V to 5.5V

more information: https://www.nxp.com/products/peripherals-and-logic/signal-chain/real-time-clocks/rtcs-with-temperature-compensation/nano-power-highly-accurate-rtc-with-integrated-quartz-crystal:PCF2131

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