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Two small green circuit boards with integrated chips and pin headers

NuoTo

NuoTo DS3231SN RTC Module 2PCS AT24C32 IIC

SKU CH-TRRG-Z7QGP

Two high-precision DS3231SN real-time clock modules with integrated AT24C32 memory and temperature-compensated oscillators for accurate timekeeping

  • CPU TypeOther
  • TCXO crystal keeps time within 2 ppm from 0 to 40 °C
  • DS3231SN chip auto-adjusts month ends and leap years until 2100
  • On-board AT24C32 stores 32 K bits via I²C at up to 400 kHz
  • Built-in ±3 °C sensor and programmable square-wave output add system functions
  • Two modules included, each 38 × 22 × 14 mm, running on 3.3–5.5 V

TCXO Real-Time Clock Module

This dual-pack supplies two DS3231SN breakout boards, each combining a temperature-compensated crystal oscillator with an AT24C32 EEPROM. The TCXO delivers 2 ppm accuracy across 0-40 °C, and the integrated sensor reads temperature to ±3 °C. Calendar registers track seconds through to year 2100 with automatic leap-year correction.

Suits embedded timing and data logging

Engineers who need battery-backed timekeeping with I²C access at up to 400 kHz will find the 3.3-5.5 V operating range and cascadable 0x57 EEPROM address convenient. Projects that require a coin cell included in the shipment or a 1 Hz square-wave output fixed by hardware should look elsewhere.

DS3231SN TCXO accuracy decides fit

The defining specification is the 2 ppm drift rating over the stated temperature range, which determines whether long-term logs stay synchronised without network time updates.

Highlights

  • TCXO crystal keeps time within 2 ppm from 0 to 40 °C
  • DS3231SN chip auto-adjusts month ends and leap years until 2100
  • On-board AT24C32 stores 32 K bits via I²C at up to 400 kHz
  • Built-in ±3 °C sensor and programmable square-wave output add system functions
  • Two modules included, each 38 × 22 × 14 mm, running on 3.3–5.5 V

Specifications

CPU TypeOther

Questions about this item

How fast does the I²C bus run on this DS3231SN module?

The I²C interface supports a maximum transmission speed of 400 KHz at 5 V operating voltage.

What are the board dimensions and mounting requirements?

The module measures 38 mm long, 22 mm wide and 14 mm high; it has no mounting holes, so it sits directly on a breadboard or header pins.

How do I wire it to an Arduino Uno R3 and what step is often missed?

Connect SCL to A5, SDA to A4, VCC to 5 V and GND to GND; the module ships without a battery, so you must add one yourself for timekeeping.

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