I2C Interface

The I²C Interface uses the SDA and SCL pins to indicate various I/O states to the ATECC608A-TNGTLS. This interface is designed to be compatible at the protocol level with the Microchip AT24C16 Serial EEPROM operating at 1 MHz.

Note: There are many differences between the two devices (for example, the ATECC608A-TNGTLS and AT24C16 have different default I²C addresses); therefore, designers should read the respective data sheets carefully.

The SDA pin is normally pulled high with an external pull-up resistor because the ATECC608A-TNGTLS includes only an open-drain driver on its output pin. The bus master may either be open-drain or totem pole. In the latter case, it should be tri-stated when the ATECC608A-TNGTLS is driving results on the bus. The SCL pin is an input and must be driven both high and low at all times by an external device or resistor.