Accurate RTC with Battery Backup | NXP Semiconductors

Accurate RTC with Battery Backup

  • This page contains information on a product that is not recommended for new designs.
NXP’s Real-Time Clocks

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Block Diagram

PCF2129

PCF2129 Block Diagram

Features

Key Features

  • Operating temperature range from -40 °C to +85 °C
  • Temperature Compensated Crystal Oscillator (TCXO) with integrated capacitors
  • Typical accuracy:
    • PCF2129AT: ±3 ppm from -15 °C to +60 °C
    • PCF2129T: ±3 ppm from -30 °C to +80 °C
  • Integration of a 32.768 kHz quartz crystal and oscillator in the same package
  • Provides year, month, day, weekday, hours, minutes, seconds and leap year correction
  • Timestamp function:
    • with interrupt capability
    • detection of two different events on one multilevel input pin (for example, for tamper detection)
  • Two line bidirectional 400 kHz Fast-mode I²C-bus interface
  • 3 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 Override (PORO)
  • Oscillator stop detection function
  • Interrupt output (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: 1.8 V to 4.2 V
  • Low supply current: typical 0.70 μA at VDD = 3.3 V

Buy/Parametrics

2 results

Include 0 NRND

Order

CAD Model

resolution

Interface

VDD (interface)

watchdog timer

Programmable alarm

countdown timer

VDD (clock)

Special features

leap year tracking

IDD (nA)

temperature compensation

AEC-Q100 compliant

PCF2129AT

Replacement part(s): PCF2131TF

1 sec to year

I2C, SPI

1.8 to 4.2

yes

yes

no

1.8 to 4.2

yes

700

yes

no

PCF2129T

Replacement part(s): PCF2131TF

1 sec to year

I2C, SPI

1.8 to 4.2

yes

yes

no

1.8 to 4.2

wide temp range of compensation

yes

700

yes

no

Documentation

Quick reference to our documentation types.

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Design Files

Engineering Services

1 engineering service

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