DS3231 + AT24C32 I2C Precision RTC Module with Battery Holder
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Prices updated: 12 Oct 2026
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About this product
A precision real-time clock (RTC) module built around the DS3231 I2C chip, which has an integrated temperature-compensated crystal oscillator, and an AT24C32 32K EEPROM for storing data. A battery holder keeps the time running when the main supply is off. It also provides two time-of-day alarms and a 32.768 kHz output, suiting data logging and timestamping projects with Arduino, ESP32 or other microcontrollers.
Specifications
- Interface
- I2C
- Supply voltage (VCC)
- 2.3 V to 5.5 V
- Timekeeping accuracy
- ±2 ppm (0 °C to +40 °C)
- EEPROM
- 32K (AT24C32)
- Backup power
- Battery holder
- Additional features
- Temperature sensor, two time-of-day alarms, 32.768 kHz output
Frequently asked questions
Does the module need an external crystal?
No. The DS3231 has an integrated crystal and temperature-compensated oscillator, so no external crystal is required.
What I2C addresses will I see on the bus?
The DS3231 uses the fixed address 0x68. On these modules the AT24C32 EEPROM typically appears at 0x57, so both devices can share the same I2C bus.
