3
Product overview
The Whadda RTC DS3231 module is a real-time clock that enables accurate timekeeping with
minimum fuss. It uses a DS3231 IC, an extremely accurate RTC chip with a built-in 32 kHz crystal
oscillator. The chip also features a basic temperature sensor and alarm clock capability.
The RTC module uses a standard I²C interface and can easily be interfaced with various
developments boards (such as an Arduino® compatible board).
Specifications
Supply voltage: 3,3
–
5 V DC
RTC IC: DS3231
RTC accuracy: ± 2 ppm (from 0 °C to +40 °C)
Temperature sensor accuracy: ± 3 °C
Maximum I²C bus frequency: 400 kHz
Backup battery: CR2032
Dimensions (W x L x H): 43,2 x 22,4 x 14,7 mm
Wiring description
Pin
Name
Arduino
®
connection
GND Ground
GND
VCC Supply voltage (3,3
–
5 V DC)
5V
SDA I²C Data line
I²C SDA (e.g A4 on Arduino®
Uno compatible)
SCL I²C Clock line
I²C SCL (e.g A5 on Arduino®
Uno compatible)
SQW Active-Low Interrupt or
Square-Wave Output
-
32K 32kHz Output
-