RTC DS3231 I2C real time clock module - STEMMA QT/Qwiic - Adafruit 5188

The real time clock (RTC) module from Adafruit. It features a DS3231 chip that integrates a quartz resonator and temperature compensator, which significantly improves the accuracy of the module. The accuracy of the DS3231 is ±3.5 ppm (±0.3024 seconds/day). The DS3231 I2C Real-Time RTC clock module also features a battery slot, allowing the module to maintain high timing accuracy even when the main power supply to the device is interrupted. The module also has STEMMA QT / Qwiic connectors for convenient connection.

Battery connector for the real time clock module from Adafruit.

• Equipped with a battery slot, which allows you to maintain high precision timing even when the main power supply to the device is interrupted.
• Providing seconds, minutes, hours, day, week, month and year information.
• Automatic month-end date adjustment, including leap year adjustments.
• Clock presents data in 24-hour or 12-hour format with AM / PM indicator.
• Two programmable alarms and programmable square wave output available.
• The module has an RST pin, which can be used as a button input to reset the microprocessor.

• VIN - power supply for RTC module
• GND - system ground
• SCL - I2C bus data line
• SDA - I2C bus clock line
• RST - calibration reset pin
• SQW - optional square wave or interrupt output

Pinoutdiagram of the module.

The RTC DS3231 real-time clock module comes with goldpin connectors.

• Supply voltage: from 3 V to 5 V
• Communication interface: I2C bus
• I2C address: 0x68
• Time measurement range: 1970 to 2100
• Work environment temperature: from -40°C to 85°C
• Timing accuracy: ±3.5 ppm (±0.3024 seconds / day)
• Product size: 25.4 x 17.8 x 7.8 mm
• Weight: 2.5 g

• RTC DS3231 I2C real time clock module - STEMMA QT / Qwiic - Adafruit 5188
• Goldpin strip for self-soldering

• Manufacturer's website: Adafruit 5188
• User guide