Description:

This ZIO module features a low power, real-time, clock battery based on the DS3231SN IC. This board has a high precision and fast I2C (400kHZ) bus with an integrated temperature compensated 32KHz crystal oscillator (TCXO) and crystal. The TCXO provides a stable and accurate reference clock, and maintains the RTC to within ±2 minutes per year accuracy from -40°C to +85°C.

The real-time clock counts seconds, minutes, hours a day, date, month and year, with leap year compensation. The clock operates either a 4-hour or 12-hour format (which includes AM/PM indicator). It also compensates the month days, and the date is automatically adjusted at the end of the month. Some other cool features in this little board are that it provides two programmable time-of-day alarms and a programmable square-wave output (check the data sheet to set the corresponding registers).

It makes readings pretty simple since all of the communication is via I2C integrating the Qwiic connect system, but as with most of our boards, we included the pinout in case you want to use a breadboard. The TCXO frequency output is available at the 32kHz pinout.

Specifications:

• Supply Voltage: 3.3V
• Current Consumption: 200μA
• Interface: I2C
• Battery Backup
• 32KHz crystal oscillator
• Operating Temperature Range -40°C to +85°C
• Low-Power Consumption
• Real-Time Clock Counts Seconds, Minutes, Hours, Day, Date, Month, and Year with Leap Year Compensation Valid Up to 2100
• Two Time-of-Day Alarms
• Programmable Square-Wave Output
• Dimensions: 30.1 x 36.4mm
• Weight:4.7g

Links:

Eagle File and Schematic

Library Link

DS3231 Datasheet