Clock Module DS3231

Low-cost, extremely accurate I2C real-time clock (RTC), with an integrated temperature-compensated crystal oscillator (TCXO) and crystal.


  • Low-cost, extremely accurate I2C real-time clock (RTC), with an integrated temperature-compensated crystal oscillator (TCXO) and crystal.
  • The device incorporates a battery input which maintains accurate timekeeping even without a power supply.
  • Integrated oscillator improve long-term accuracy of the device.
  • DS3231 available in commercial and industrial temperature ranges, using a 16-pin 300mil SO package.
  • RTC maintains seconds, minutes, hours, day, date, month, and year information. For months with less than 31 days, the end date will be automatically adjusted, including corrections for leap year.
  • Clock operates in either the 24 hours or band / AM / PM indication of the 12-hour format. Provides two configurable alarm clock and a calendar can be set to a square wave output.
  • Address and data are transferred serially through an I2C bidirectional bus.
  • A precision temperature-compensated voltage reference and comparator circuit monitors the status of VCC to detect power failures, provide a reset output, and if necessary, automatically switch to the backup power supply.
  • RST pin is monitored as generating μP reset manually.
  • The device integrates a very precise digital temperature sensor, accessible through the I2C interface.
  • Temperature sensor accuracy is ± 3°C. On-chip power supply control circuit can automatically detect and manage the main and standby power (i.e. low-voltage battery) to switch between the power supply.
  • If the main power failure, the device can continue to provide accurate timing and temperature, performance is not affected.
  • When the main power re-powers or voltage value returns to within the allowable range, the on-chip reset function can be used to restart the system microprocessor.


  • Size: 38mm (length) * 22mm (width) * 14mm (height)
  • Operating Voltage: 3.3 - 5.5v
  • Clock Chip: High-precision clock chip DS3231
  • Clock Accuracy: 0-40°C range, the accuracy 2ppm
  • Calendar alarm clock with two programmable square-wave output
  • Real time clock generator with seconds, minutes, hours, day, date, month and year timing which provides valid timing until the year 2100 with leap year compensation
  • Chip temperature sensor comes with an accuracy of ± 3°C
  • Memory Chip: AT24C32 (storage capacity 32K)
  • IIC bus interface, the maximum transmission speed of 400KHz (working voltage of 5V)
  • Can be cascaded with other IIC device, 24C32 addresses can be shorted A0/A1/A2 modify default address is 0x57
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