Adafruit DS3231 Precision RTC Breakout

The datasheet for the DS3231 explains that this component is an extremely accurate I²C integrated RTC/TCXO/crystal. This real-time clock (RTC) is the most precise you can get in a small, power-saving package.

Most RTCs use an external 32kHz timing crystal to keep time with low power consumption. However, these crystals have a slight drift, especially with temperature fluctuations, as the oscillation frequency changes slightly. This RTC is housed in a robust casing, as the crystal is located inside the chip. Right next to the integrated crystal is a temperature sensor that compensates for frequency changes by adding or removing clock ticks, ensuring that timekeeping remains on schedule.

This is the best RTC you can get, and now we have it in a compact, breadboard-friendly breakout. With a coin cell inserted on the back, you can maintain precise timekeeping for years even during power outages. Ideal for data logging and clocks or anything where you really need to know the time.

It comes as a fully assembled and tested breakout with a small piece of header. You can solder the header to plug it into a breadboard or solder wires directly.

A coin cell is required to utilize the battery backup capabilities. To simplify international shipping, we do not include one, but we have them in stock, so grab one or use a CR1220 that you have on hand.