DS3231 AT24C32 High Precision Clock Module IIC Module Memory Module 1. Size: 38mm (length) X22mm (width) X14mm (height) 2. Weight: 8g 3. Working voltage: 3.3--5.5V 4. Clock chip: High-precision clock chip DS3231 5. Clock accuracy: Within 0-40 degree C, accuracy 2ppm, annual error about 1 minute 6. With 2 calendar alarm clocks 7. Programmable square wave output 8. Real-time clock generates seconds, minutes, hours, week, date, month and year time, and provides leap year compensation valid to 2100 years 9. The temperature sensor inside the chip has an accuracy of +- 3 degree C 10. Memory chip: AT24C32 (storage capacity 32K) 11. IIC bus interface, high transmission speed 400KHz (when working voltage is 5V) 12. Can cascade other IIC devices, 24C32 address can be modified by short circuit A0 A1 A2, the default address is 0x57 13. With rechargeable battery LIR2032 to ensure that the clock still runs normally after the system is powered off 14. Packing: Single anti-static packaging 15. Wiring instructions (taking Arduino uno r3 as an example): SCL -- A5 SDA -- A4 VCC -- 5V GND -- GND 16. DS3231 is a low-cost, high-precision I2C real-time clock (RTC) with integrated temperature-compensated crystal oscillator (TCXO) and crystal. The device contains a battery input, which can maintain accurate timing when the main power is disconnected. The integrated crystal oscillator improves the long-term accuracy of the device and reduces the number of components in the production line. The DS3231 offers commercial and industrial temperature ranges and is available in a 16-pin 300mil SO package. 17. RTC saves seconds, minutes, hours, day, date, month and year information. Months less than 31 days will automatically adjust the end of the month, including corrections for leap years. The working format of the clock can be 24 hours or a 12-hour format with AM PM indication. Provide two configurable calendar alarms and a configurable square wave output. The address and data are transfe