I purchased a DRV8711 EVM to so if the DRV8711 is a possible replacement for the A4988. I had some trouble with the first board like the FAULTn LED not being lit as mentioned in another thread. Apart from that, I can not even activate the output stage. I did some measurements and found V5 not beeing present. According to the datasheet this is the 5V output from the DRV8711, so this voltage should be present even when the device is in sleep mode?!
The only function I see is the blinking status LED. I'm also not sure if communication between PC, microcontroller and DRV8711 is working as expected. Is there any way to check that? E.g. a simple SPI read to a certain register? Should the blink frequency of the status LED change during a transfer?
I already returned one board with V5 not beeing present and purchased a new one, but the problems still exist with the new board. J1 was missing on both boards, but adding a jumper to "JTAG" position doesn't make a difference.
Power supply is 24V= from a smal lab supply. Operation system is Win7 (32bit!).
With kind regards,
Thorsten Ostermann