Introduction - If you have any usage issues, please Google them yourself
I2C communication module scl- I2C clock signal-* sda is- I2C data signal-* ok- I2C read/write is complete- the ack- the input write data to the module, this module confirmation-* ntf- Upon completion of the read operation, to inform the external data has been good-* dat_o- read operation after the end of the output data