DFRobot: DS3231 Real Time Clock (RTC) Clock Timing Fermion Platform Evaluation Expansion Board

This real-time clock module (RTC) uses the DS3231 chip that integrates a crystal resonator and a temperature compensator, which improves the long-term accuracy of the module. In the range of -40°C to 85°C, the accuracy of DS3231 remains at ±3.5ppm (±0.03024 seconds/day).

The device incorporates a battery input, and maintains high precision timing when main power to the device is interrupted. The RTC provides information of seconds, minutes, hours, week, day, month and year, and it can automatically adjust the date at the end of the month, including corrections for leap year. The clock operates in either the 24-hour or 12-hour format with AM/PM indicator. Two programmable time-of-day alarms and a programmable square-wave output are provided. In addition, the RST pin can be used as a push-button input for microprocessor reset.

NOTE: Due to the latest air cargo regulations, the transport audit of special items such as batteries, magnets and liquids will become very strict, so this RTC module does not come with batteries anymore, please buy them locally. The button cell battery model that goes with the module is CR1220.

Module Specification:

Supply Voltage: 3.3V to 5.5V
I2C Address: 0x68
Timing Range: from 1970 to 2100
Operating Environment Temperature: from -40°C to 85°C
Timing Accuracy: ±3.5ppm (0.3024 seconds/day)
Product Size: 22.5 x 21mm

Package:
1x Fermion: DS3231 Precise RTC (Breakout) Board
1x 2.54-7P Single Row Connector