High Precision Real Time Clock Module

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This is a DS3231 module and is an extremely accurate I2C real-time clock [RTC], with an integrated temperature-compensated crystal oscillator and crystal to improve the long-term accuracy of the module.

The DS3231 maintains seconds, minutes, hours, day, date, month, and year information. When there are less than 31 days of the month, the end date will be automatically adjusted, including corrections for leap year. The clock operates in either the 24 hours or band / AM / PM indication of the 12-hour format and has two configurable alarm clocks and a calendar that can be set to a square wave output.

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. In addition, the RST pin provides a manual reset.

The DS3231 includes a very precise digital temperature sensor which can be accessed through the I2C interface. This temperature sensor accuracy is ± 3 ° C.

There is also an on-chip power supply control circuit that can automatically detect and manage the main and standby power (i.e., low-voltage battery) to switch between the power supply and battary.

It is more accurate than the DS1307.

Features: 

  • Operating voltage: 3.3 - 5.5V
  • Two calendar alarm clock
  • Programmable square-wave output
  • Real time clock generates seconds, minutes, hours, day, date, month and year timing and is valid until 2100 with Leap Year Compensation
  • Onboard temperature sensor
  • 32K of memory (AT24C32)
  • I2C bus interface (can be cascaded), the maximum transmission speed of 400KHz (working voltage of 5V)
  • Default address is 0x68
  • Includes rechargeable battery (LIR2032)
  • Dimensions (mm): 38 x 22 x 14

Mode of connection:

  1. GND
  2. VCC
  3. SDA
  4. SCL

Example:

A great library that works with this module can be found here.

Warranty and Support:

We programme and use all our products in our projects so are able to offer technical support and documentation.

We provide a warranty for any defects in manufacturing.

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