The ChronoDot RTC is an extremely accurate real time clock module, based on the DS3231SN temperature compensated RTC (TCXO) which is able to withstand a -40C to +85C temperature range . This product requires a CR1632 battery, which should last at least 8 years if the I2C interface is only used while the device has 5V power available. No external crystal or tuning capacitors are required.
THIS IS THE LATEST VERSION 2.1 WHICH REQUIRES NO SOLDERING
The DS3231SN has an internal 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. However, ultra-precise 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 external clock. Since the ChronoDot needs to read the temperature, it also contains a fairly accurate temperature sensor, accessible through I2C. Stated accuracy is +/- 3C, though the temperature register returns values with a resolution of 0.25C. Calibration may improve accuracy.
The ChronoDot will plug into a standard solderless breadboard and also has mounting holes for chassis installation.
The 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, Raspberry Pi, Basic Stamp, Cubloc, and other controllers should work with no modification. Perfect for datalogging, clock-building, time stamping, timers and alarms, etc. works perfectly with 5V-based chips such as the Arduino or Raspberry Pi!
The Adafruit ChronoDot Ultra-Precise RTC (v2.1) Breakout Board Kit Features:
Plugs into any breadboard, or you can use wires.
Ultra-Precise RTC utilising the DS3231 Temperature Compensated RTC