ZHCSI79B March 2016 – May 2018 TAS5751M
PRODUCTION DATA.
The ADR/FAULT is an input pin during power-up and after each toggle of RST, which is used to set the I²C sub-address of the device. The ADR/FAULT can also operate as a fault output after power-up is complete and the address has been latched in.
At power-up, and after each toggle of RST, the pin is read to determine its voltage level. If the pin is left floating, an internal pull-up will set the I²C sub-address to 0x56. This will also be the case if an external resistor is used to pull the pin up to AVDD. To set the sub-address to 0x54, an external resistor (specified in Typical Applications) must be connected to the system ground.
As mentioned, the pin can also be reconfigured as an output driver via I²C for fault monitoring. Use System Control Register 2 (0x05) to set ADR/FAULT pin to be used as a fault output during fault conditions.