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RTC DS3231 Module

by Velleman

The RTC DS3231 module is a real-time clock that enables accurate time-keeping with minimum fuss.

It uses a DS3231 IC, which is an extremely accurate RTC chip with a built-in 32 kHz crystal oscillator. The chip also features a basic temperature sensor and alarm clock capability.

The RTC module uses a standard I²C interface and can easily be interfaced with various developments boards (such as an Arduino® compatible board).


  • extremely accurate RTC chip with built-in 32 kHz crystal
  • temperature sensor
  • alarm clock capability


  • supply voltage: 3,3 - 5 V DC
  • RTC IC: DS3231
  • RTC accuracy: ± 2 ppm (from 0 °C to + 40 °C)
  • temperature sensor accuracy: ± 3 °C
  • max. I²C bus frequency: 400 kHz
  • dimensions (W x L x H): 43,2 x 22,4 x 14,7 mm
  • backup battery: CR2032 (included)