8.4.14 Black Box First Fault Logging

The first fault in a system failure event is usually critical to diagnose the root cause. An innovative Black Box Fault Logging feature is introduced in UCD90320 to accelerate the debugging process. When UCD90320 detects the first fault, the device records and saves the status of each rail and I/O pin in a special area of the EEPROM reserved for this function. The device does not save the subsequent faults and monitoring statuses into the Black Box Fault Log, but instead records them into the standard fault log. The Black Box Fault Log must be cleared in order to acknowledge the next fault.

Figure 34. Black Box Fault Logging Window (Status ►Blackbox Info tab)