3Pcs DS3231 RTC I2C Real Time Clock Module Provides Dual Calendar Alarm Clocks Programmable Square Wave Output I2C Interface AT24C32 Connected for Raspberry Pi, AVR, ARM
3Pcs DS3231 RTC I2C Real Time Clock Module Provides Dual Calendar Alarm Clocks Programmable Square Wave Output I2C Interface AT24C32 Connected for Raspberry Pi, AVR, ARM
Key features
- The operating voltage (VCC) and backup battery voltage (VBAT) of DS3231 are both 2.3V ~ 5.5V, compatible with 3.3V and 5V systems, and the maximum timing current is 130μA ~ 200μA
- DS3231 supports 24-hour or 12-hour time format (HH:MM:SS) with AM/PM indication and YY-MM-DD-dd date format. It adopts I2C (2-wire serial port) interface, with a maximum rate of 400kHz. It provides two calendar alarm clocks and programmable square wave output (supports 1Hz, 1.024kHz, 4.096kHz, 8.192kHz, etc.)
- DS3231 RTC module DS3231 IC and AT24C32 EEPROM IC for storing time and date data. Other components include the power on LED, some resistors, capacitors, battery holder and pins for connecting to the microcontroller.
- I2C communication address: device address is 0xD0 (write)/0xD1 (read), supports 100kHz standard mode and 400kHz fast mode
- The register addresses of DS3231 are 00h~12h, which are used to store seconds, minutes, hours, days of the week, dates and alarm clock setting information.
The DS3231 is an I2C real-time clock (RTC) with a built-in temperature-compensated crystal oscillator (TCXO) and a low-cost, exceptionally accurate crystal. The device's long-term accuracy is enhanced by the inclusion of a crystal oscillator. RTC tracks seconds, minutes, hours, days, dates, months and years. For months with fewer than 31 days, the month-end date is automatically modified to include leap year corrections. The clock has AM/PM indication and operates in 24-hour or 12-hour mode. Includes two programmable time alarms, and a programmable square wave output. I2C bidirectional bus for serial transfer of address and data The DS3231 module has 6 pins that are used to get data from the module and provide power to the board. The pinout of DS3231 is as follows: VCC (Pin 2): Main power input, requires a 0.1µF~1µF capacitor for filtering. GND (Pin 13): Power supply ground. VBAT (Pin 14): Backup battery input to maintain timing during power outage. SDA (Pin 15): I2C data line, requires an external pull-up resistor. SCL (Pin 16): I2C clock line, requires an external pull-up resistor. INT/SQW (Pin 3): Interrupt or square wave output, open drain needs to be pulled up.
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