Other Parts Discussed in Thread: DRV8873, L293, L293D
We bought the evaluation module. Our software engineer used it in my absence and said it worked only once.
I bought another one and together we wired it up carefully. We are driving a linear motor (24 V, 20 W). We used the TI software to control it.
The linear motor moved in one direction. It got to the end point of its travel and stopped by a switch internal to the linear motor that disconnects the power. At that point the fault light on the evaluation board went red and the SPI indicates all ones. The chip is now dead.
This is what happened to the first evaluation board. Now I am convinced our software engineer did nothing wrong and we are two out of two failures with this chip.
Why?
(And can I get a refund?)