怀疑是上电后8860输出部分的MOS管直接对地击穿了。
这是电路图
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引脚没有短路,对地对电源都没有,那如果不是短路的话为什么上电之后程序没有做任何驱动但芯片八个引脚都被驱动了呢?而且无法通过程序来控制这个芯片
不是很明白,你是实际板上测到芯片短路还是仿真程序里面看到的?上电后的SPI初始化都做了些什么?
在规格书上有如下描述:
There is no specific sequence for powering-up the DRV8860. It is okay for digital input signals to be present before VM is applied. After VM is applied to the DRV8860, it begins operation based on the status of the control pins.
在VM上电后,如无SPI信号设定输出状态,则输出状态跟随ENABLE信号。请确认在SPI进行状态设置前,ENABLE信号为低,并通过SPI信号进行输出状态控制。