It is the best real-time clock (RTC) you can get that allows your Raspberry Pi project to track the time in the event of a power failure. Perfect for data logging, clock construction, NTP servers, time stamping, timers and alarms, etc. Equipped with a real DS3231 RTC, it works perfectly with the Raspberry Pi and has a native kernel support.

The DS3231 data sheet explains that this part is an "RTC/TCXO/Crystal integrated I²C extremely accurate". And, hey, he does exactly what it says on the box! This real-time clock (RTC) is the most accurate you can get in a small, low-power box.

Most PSTNs use an external 32kHz synchronization crystal that is used to keep time with low power consumption. And that's fine, but these crystals have a slight drift, especially when the temperature changes (the temperature changes the oscillation frequency very very very slightly but it adds up !) This RTC is in a strong package because the crystal is inside the chip ! And right next to the integrated crystal is a temperature sensor. This sensor compensates for frequency changes by adding or removing clock ticks to keep the timing on time.

Many "cheap" DS3231 RTC cards do not use real DS3231 Maxim - you will get an uncalibrated RTC that does not maintain the quality of timing that is specified! We buy these DS3231 from Maxim directly to ensure that they are 100% authentic.

Works perfectly with any Raspberry Pi (or similar single card linux computer), including Pi 1, Pi 2, Pi 3, Pi 4, Pi Zero, A+, B+ etc.

    Fully assembled and tested PCB connectors directly into the GPIO pins of your Pi's - No soldering required!
    Will keep for 5 years or more

Note: This product does not come with a CR1220 battery, we recommend that you purchase a CR1220 button cell battery for use with this product.


Product dimensions: 21.3 mm x 20.0 mm x 20.0 mm x 13.6 mm / 0.8 in x 0.8 in x 0.8 in x 0.5 in

Product Weight: 2.7g / 0.1oz