The DS3231 Precision RTC FeatherWing adds highly accurate, temperature-compensated timekeeping with battery backup to any Feather board—ideal for datalogging, clocks, and projects that need reliable timekeeping.
A Feather board without ambition is a Feather board without FeatherWings! This is the AdafruitDS3231 Precision RTC FeatherWing: it adds an extremely accurate I2C-integrated Real Time Clock (RTC) with a Temperature Compensated Crystal Oscillator (TCXO) to any Feather main board. This RTC is the most precise you can get in a small, low power package. Using our Feather Stacking Headers or Feather Female Headers you can connect a FeatherWing on top of your Feather board and let the board take flight!
Most RTCs use an external 32kHz timing crystal that is used to keep time with low current draw. And that's all well and good, but those crystals have slight drift, particularly when the temperature changes (the temperature changes the oscillation frequency very very very slightly but it does add up!) This RTC is in a beefy package because the crystal is inside the chip! And right next to the integrated crystal is a temperature sensor. That sensor compensates for the frequency changes by adding or removing clock ticks so that the timekeeping stays on schedule.
With a CR1220 12mm coin cell plugged into the top of the FeatherWing, you can get years of precision timekeeping, even when main power is lost. Great for datalogging and clocks, or anything where you need to really know the time.
A CR1220 coin cell is required to use the battery-backup capabilities! We don't include one by default, to make shipping easier for those abroad, but we do stock them so pick one up or use any CR1220 you have handy.
Please note that the coin cell battery and breadboard are not included.
Features
DS3231 Precision Real Time Clock (RTC) with I2C interface
Temperature Compensated Crystal Oscillator (TCXO) integrated into chip
Accurate timekeeping with automatic temperature compensation
Low power consumption
CR1220 coin cell battery backup for years of operation without main power
Compatible with all Feather boards using Feather Stacking or Female Headers
Ideal for datalogging, clocks, and time-sensitive applications
Specifications
Product Dimensions: 50.8mm x 22.9mm x 1.6mm
Weight: 4.8g
Revision History
As of January 17, 2023 – we've updated this PCB with Adafruit Pinguin to make a lovely and legible silkscreen - you may get the new PCB or the older version with vector fonts - both are identical other than the fancy silkscreen.
