The main SW configuration is shown as follows:

1. System initialization: The main control MCU powers on and initializes UCC5880, enables SPI communication, sets the chip to configuration mode.
2. Parameter configuration: Configure DESAT detection threshold, ADC sampling parameters, fault blanking time and fault latch enable through SPI.
3. Detection loop startup: UCC5880 turns on DESAT detection loop, applies weak detection voltage, and waits for voltage signal stabilization.
4. Voltage sampling and judgment: The built-in ADC samples DESAT pin voltage and compares it with the preset threshold:
   1. Sampling voltage ＞ failure threshold: IGBT module is normal.
   2. Sampling voltage ≤ failure threshold: IGBT module has short-circuit failure.
5. Fault handling:
   1. If normal, exit configuration mode and the system can start normally;
   2. If failed, latch the fault and upload fault signal.
6. Fault reset: If the fault disappears, the MCU sends a reset command through SPI to clear the fault latch and execute the detection process again.