This is a Real Time Clock module for the PCF2129, a Real Time Clock IC by NXP. The PCF2129 has a selectable I²C-bus or SPI-bus.

It also has a backup battery switch-over circuit that lets you backup the timestamp information.

Features

• Operating voltage: 1.2V - 4.2V

• Temperature Compensated Crystal Oscillator (TCXO) with integrated capacitors

• Typical accuracy:

• PCF2129AT: ±3 ppm from -15 °C to +60 °C

• 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)

• SPI-bus and I²C-bus interface

• Battery backup input pin and switch-over circuitry

• Programmable watchdog timer with interrupt

• Programmable alarm function with interrupt capability

Cautions

• Please prepare pin headers separately and solder them for your intended use.

Pin allocation

Surface

Back

Documents

• Product Page (Data sheet)

• Sample source (mbed)

• Schematic (pdf)

• Measurements (pdf)

Category

• Switch Science Originals