The uses I²C compatible interface for flexible charging parameter programming and instantaneous device status reporting. I²C is a bi-directional 2-wire serial interface. Only two bus lines are required: a serial data line (SDA) and a serial clock line (SCL). Devices can be considered as host or target when performing data transfers. A host is the device which initiates a data transfer on the bus and generates the clock signals to permit that transfer. At that time, any device addressed is considered a target.

I2C address is 7 bits 6Bh, for 8 bits I2C commands the last bit is read(1b)/write(0b) bit. Therefore 8bits I2C address command is integrated as 0b1101011_X(D6h for write/D7h for read). The device receive control inputs from the host device like micro controller or a digital signal processor through REG00-REG3F. The I2C interface supports both standard mode (up to 100 kbit/s), fast mode (up to 400 kbit/s) and fast-mode plus (up to 1 Mbit/s). Connecting SCL and SDA to the positive supply voltage via pull-up resistor. The device I²C detection threshold supports a communication reference voltage between 1.2V- 3.3V. When the bus is free, both lines are HIGH. The SDA and SCL pins are open drain.