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TMS320F28021: 死机后无法自动恢复

Part Number: TMS320F28021
Other Parts Discussed in Thread: C2000WARE

数字电源PFC中有用到TMS320F28021,在雷击测试后出现了3种结果:

1. DSP仍然正常运行

2. DSP有复位重启的现象

3. DSP死机,也没有重启

前面2种情况属于正常现象,现在有疑惑的是第3种情况。因为软件中开启了看门狗,如果因为外部干扰或电源不稳等因素导致软件跑飞,那看门狗应该会起作用。这个时候DSP会重启才对,为什么会一直处于死机的状态呢?