There was a problem in the design of the product,which was on the chip。When I get on the power, the chip occasionally doesn't output frequency.There are 4 problem products in more than 100 products.
The input frequency is 10MHz，and I used the simulation SPI protocol.
when problem appeared，I checked spi timing normal，and reset pin was high.The chip was in a hot state，and the power consumption of the chip was 2W.
I have the chip replacement for the defective product，and then it was ok so that i cannot Determine the problem.
I think there should be no problem with the chip，so I hope someone can give me some tests mothod or suggests.
The current speculation is welding 、chip diversity、Peripheral circuit parameters。