Adafruit ChronoDot - Ultra-precise Real Time Clock

Item number: AF255

MPN: 255

Category: Clock/ RTC

23,79 €

including 19% VAT.,

Available now!

Shipping time: 1 - 3 workdays



he ChronoDot RTC is an extremely accurate real time clock module, based on the DS3231 temperature compensated RTC (TCXO). It includes a CR1632 battery (not shown, but included in the product) which should last at learnst 8 years if the I2C interface is only used while the device has 5V power available. No exteal crystal or tuning capacitors are required.

he top side of the Chronodot now features a battery holder for 16mm 3V lithium coin cells. It should work fine for CR1620 - CR1632 batteries.

Click here for documentation and example code.

he DS3231 has an inteal crystal and a switched bank of tuning capacitors. The temperature of the crystal is continously monitored, and the capacitors are adjusted to maintain a stable frequency. Other RTC solutions may drift minutes per month, especially in extreme temperature ranges...the ChronoDot will drift less than a minute per year. This makes the ChronoDot very well suited for time critical applications that cannot be regularly synchronized to an exteal clock.

he ChronoDot will plug into a standard solderless breadboard and also has mounting holes for chassis installation.

he I2C interface is very straightforward and virtually identical to the register addresses of the popular DS1337 and DS1307 RTCs, which means that existing code for the Arduino, Basic Stamp, Cubloc, and other controllers should work with no modification.This new version has a battery holder, no soldering required!

Technical Details

Dimensions (without battery):

  • Length: 30.4mm/1.2in diameter
  • Height: 14.1mm/0.55in
  • Weight: 4 g
  • This board/chip uses I2C 7-bit address 0x68

netduino driver, netduino sample and Documentation! This sample exercises all the functions of the clock (same as the DS1307 driver and samples)

Also recommended is Paul Stoffergen's RTC example code (for all Arduino's and compatibles): and

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