Other Parts Discussed in Thread: DRV8242-Q1, DRV8243-Q1
Tool/software:
Hi,
I would like to use the hardware version of the device to control a motor, but without using a microcontroller. I can see one problem with this:
Since the OCP_MODE is fixed to latched shutdown (why is there a "Overcurrent retry time (H/W Device)" of 4 ms spec???) I somehow need to handle this in case the protection gets triggered. I was thinking about using the nFAULT pin somehow trigger a reset through the nSLEEP pin. A direct connection wouldn´t work, because the nFAULT pin is held low on startup until the digital core is ready. I tried to come up with some sort of delay circuit to prevent this, but couldn´t find a solution. It wouldn´t work, but this is what I tried: the 100k resistror reprents the nSLEEP pin and the switch represents the nFAULT pin. I have a supply voltage of 28V. The cap is dicharged on powerup, so the DRV will never turn on.
I am also not sure if the nFAULT pin gets released in sleep mode, but I think yes. The datasheet says "In sleep mode, all the internal MOSFETs are disabled" and in the block diagram the nFAULT pin is driven by a mosfet. Any help would be appreciated.
