PCF2131 datasheet(1/86 Pages) NXP

Part #	PCF2131

Description	Nano-power highly accurate RTC with integrated quartz crystal

PDF	86 Pages

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Manufacturer	NXP [NXP Semiconductors]

Direct Link	http://www.nxp.com

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PCF2131

Nano-power highly accurate RTC with integrated quartz

crystal

Rev. 1.1 — 15 October 2021

Product data sheet

1 General description

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 has a selectable I2C-bus or SPI-bus, a backup battery switch-over circuit, a

programmable watchdog function, four timestamps function, and many other features.

For a selection of NXP Real-Time Clocks, see Section 15.1.

2 Features and benefits

• Operating temperature range from -40 °C to +85 °C

• Temperature Compensated Crystal Oscillator (TCXO) with trimmed integrated

capacitors

• Ultra low supply current: typical 64 nA at VDD = 3.3 V

• Temperature compensated RTC, typical accuracy ±3 ppm from -40 °C to +85 °C

• Integration of a 32.768 kHz 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 400 kHz Fast-mode I2C-bus interface

• 4-line SPI-bus with separate data input and output (maximum speed 6.5 Mbit/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: 1.2 V to 5.5 V

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PCF2131 Datasheet(PDF) 1 Page - NXP Semiconductors

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