DS3231 Precision RTC FeatherWing - RTC Add-on For Feather Boards
A Feather board without ambition is a Feather board without FeatherWings! This is the DS3231 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.
Pinout
- 3.3V
Board power input for the RTC FeatherWing. Adafruit Learn states the bottom-row 3.3V pin is used to power the RTC and take load off the coin cell battery.
Type · powerVoltage · 3.3V - GND
Ground reference for the RTC FeatherWing. Adafruit Learn states the bottom-row GND pin is used with 3.3V to power the RTC.
Type · groundVoltage · 0V - SCL
I2C clock pin for talking to the DS3231 RTC; Adafruit Learn states it has a 10K pullup resistor to 3.3V.
Type · signalVoltage · 3.3V pullup - SDA
I2C data pin for talking to the DS3231 RTC; Adafruit Learn states it has a 10K pullup resistor to 3.3V.
Type · signalVoltage · 3.3V pullup - SQW
Optional square-wave or interrupt output. Adafruit Learn states SQW is open-drain and needs a pullup to read from a microcontroller pin.
Start wiring
I2C · SPI · 3.3V · 0V
Confirm the data interface matches your host board.
Module pins: 3.3V, GND, SCL, SDA, SQW, RST. Schematik maps them to your board in the app.
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