To use DS3231 high-precision real-time clock chip (IIC interface rate 400KHz)
Set aside AT24Cxx IIC interface EEPROM memory interface， such as the need to own welding
Chip integrated internal precision 32.768KHz TCXO error within the range of 0℃ to 40℃ 2ppm， the annual error of about 1 minute
Chip internal temperature sensor accuracy 3℃， resolution of 0.5℃ to measure the ambient temperature
Welding CR927 non-rechargeable 3V battery
The power supply terminal to join the anti-reverse diode reverse power burn circuit is not energized
Set the power indicator
Leads SQW/INT and 32KHz square wave output interface， can output different frequency square wave output alarm interrupt
Can be cascaded to other the IIC devices， welding 6P bend the pins

Frequently Asked Questions:
Q1. Why are these called "Arduino Compatible"?
A1. The Arduino group demanded us to remove their logos and rename these products so that they do not lead customers to believe they are the same units sold by Arduino
Q2. Are these 100% compatible with the "normal" Arduino's?
A2. Yes， they really are completely compatible with "normal" Arduino's. Build quality looks the same and everything (studio， library， tools， etc) just works