5.5 SMBus Timeout
The ECC608-TNGHNT supports the SMBus Timeout feature in which the ECC608-TNGHNT will reset its serial interface and release the SMBus (i.e., stop driving the bus and let SDA float high) if the SCL pin is held low for more than the minimum tTIMEOUT specification.
When t TIMEOUT is reached, the device will go into sleep mode. The ECC608-TNGHNT will be ready to accept a new wake sequence followed by a Start condition once the tTIMEOUT maximum has elapsed.