A replacement of the DS3231 with the same board pinout:
| DS3231 | RV3032 | Description |
|---|---|---|
| GND | GND | GND |
| VCC | VCC | 2.0-5.5V |
| SDA | SDA | I2C SDA |
| SCL | SCL | I2C SCL |
| SQW | CLKOUT | Temperature compensated square wave |
| 32K | INT | DS3231: oscillator clock; RV3032: interrupt pin |
Board dimensions: 14 x 16 mm.
See schematics.pdf.