Clock chip: high-precision clock chip DS3231SN; The DS3231 is an RTC IC developed by Maxim Integrated. It is a low cost, extremely accurate RTC IC with communication over I2C Interface. An interesting feature of DS3231 RTC IC is that it has integrated crystal oscillator and temperature sensor and hence you don’t have to connect an external crystal. It is a low-cost, extremely accurate I2C real-time clock (RTC), with an integrated temperature-compensated crystal oscillator (TCXO) and crystal. AITRIP 3PCS DS3231 Real Time Clock Module RTC Sensor High Precision AT24C32 IIC Timer Alarm Clock for Arduino Raspberry Pi. Note: （Batteries are not included in the package. Please purchase the battery as shown in the picture locally） The DS3231 is an RTC IC developed by Maxim Integrated. It is a low cost, extremely accurate RTC IC with communication over I2C Interface. An interesting feature of DS3231 RTC IC is that it has integrated crystal oscillator and temperature sensor and hence you don’t have to connect an external crystal. A precision temperature-compensated voltage reference and comparator circuit monitors the status of VCC to detect power failures, provide a reset output. In addition, RST pin is monitored as generating a μP reset. The DS3231 is available in commercial and industrial temperature ranges, using a 16-pin 300mil SO package.

Module Parameters

1. Size: 38mm (L) * 22mm (W) * 14mm (H)

2. Weight: 8g

3. Operating voltage: 3.3-5.5V

4. Clock chip: high-precision clock chip DS3231. (there are 3 different chips for this clock module: DS3231N, DS3231SN and DS3231M, we send it by randomly)

5. Clock Accuracy: 0-40 ℃ range, the accuracy 2ppm, the error was about 1 minute

6. Memory chips: AT24C32 (storage capacity 32K)

7. Real time clock generator seconds, minutes, hours, day, date, month and year. And provide valid until the year 2100 leap year compensation

8. Chip temperature sensor comes with an accuracy of ± 3 ℃

9. IIC bus interface, the maximum transmission speed of 400KHz (working voltage of 5V)

10. Can be cascaded with other IIC device, 24C32 addresses can be shorted A0/A1/A2 modify default address is 0x57

Pin Description:

32KHz：32KHz output

SQW：Active LOW Interrupt or Square wave output

SCL：Serial Clock Input

SDA：Serial Data I/O

VCC：DC Power Pin

GND：Ground

Wiring instructions 

SCL → A5

SDA → A4

VCC → 5V

GND → GND

Package Included:

3 X DS3231 Clock module