SLVSFZ4A December 2020 – February 2021 TPS929121-Q1
PRODUCTION DATA
In fail-safe state, the TPS929121-Q1 also detects all failures and reports the status out by ERR or FLAG registers. The summary of the fault detection criteria and the device behavior after fault detected is listed in Table 8-4. Basically the TPS929121-Q1 actively takes the action to turn off the failed output channels, retry on the failed channels, or restart the device to keep device operating without controlled by master. The EEPROM register EEP_OFAF can be used to set the fault behavior for LED short-circuit and LED open-circuit. The one-fails-all-fail behavior is selected when the register EEP_OFAF is burnt to 1; otherwise the one-fails-others-on behavior is chosen. The TPS929121-Q1 turns off all output channels when any one type of LED fault is detected on any one of output channels for one-fails-all-fail behavior. On the other hand, the TPS929121-Q1 only turns off the failed channel and keep all other normal channels on.
In fail-safe state, the fault flag registers of TPS929121-Q1 still can be accessed through FlexWire interface for master controller to identify the fault.