DS3231 AT24C32 precision clock module IIC module storage module without battery

DS3231 High Precision Clock Module


DS3231 is a low-cost, high-precision I2C real-time clock (RTC) with an integrated temperature-compensated crystal oscillator (TCXO) and crystal. The device includes a battery input to maintain accurate timing when the main power supply is disconnected. The integrated crystal oscillator increases the longevity of the device and reduces the number of components on the production line. The DS3231 is available in commercial and industrial temperature ranges and is packaged in a 16-pin 300mil SO package.
The RTC stores seconds, minutes, hours, weekdays, date, month, and year information. For months with less than 31 days, the date at the end of the month is automatically adjusted, including corrections for leap years. The clock can operate in either 24-hour or 12-hour format with /AM/PM indication. Two programmable calendar alarms and a programmable square wave output are provided. Addresses and data are transmitted serially via the I2C bidirectional bus.
The temperature-compensated voltage reference and comparator circuits are used to monitor the VCC status, detect power failures, provide a reset output, and automatically switch to the backup power supply when necessary. In addition, the /RST monitor pin can be used as a manual input to generate a μP reset. 
In addition to high timing accuracy, the DS3231 has several other functions that expand the system host's additional functionality and options. The device integrates a very digital temperature sensor that can be accessed (like the time) through the I2C* interface. The temperature sensor has an accuracy of ±3°C. On-chip control circuitry enables automatic power detection and manages power switching between the main power supply and the backup power supply (i.e., low-voltage battery). If the main power supply is lost, the device can continue to provide timing and temperature without affecting performance. When the main power supply is re-energized or the voltage value returns to the allowable range, the on-chip reset function can be used to restart the system microprocessor.


Module parameters:
1. Size: 38mm (length) * 22mm (width) * 14mm (height)
2. Weight: 8g
3. Working voltage: 3.3--5.5V
4. Clock chip: high-precision clock chip DS3231
5. Clock accuracy: 0-40℃ range, accuracy 2ppm, annual error about 1 minute
6. With 2 calendar alarms
7. Programmable square wave output
8. Real-time clock generates seconds, minutes, hours, weeks, dates, months and years, and provides leap year compensation valid until 2100
9. Chip internal Built-in temperature sensor, accuracy is ±3℃
10. Memory chip: AT24C32 (storage capacity 32K)
11. IIC bus interface, high transmission speed 400KHz (when the working voltage is 5V)
12. Can cascade other IIC devices, 24C32 address can be modified by short-circuiting A0/A1/A2, the default address is 0x57
13. With battery CR2032, ensure that the clock still moves normally after the system is powered off
14. Packing method: single anti-static packaging
Wiring instructions (taking Arduino-uno-r3 as an example):
SCL→A5
SDA→A4
VCC→5V
GND→GND
Delivery list:
1. One DS3231 module