We have the first spin of our motor control board, and while things appear.. ok.. we're seeming some weirdness when we run the motor.. specifically it seems to consistently miss one Hall state (making the motor spin rough).
Our hardware guru (new hire) probed the OCTW pin and we're seeing a burst of pulses at regular periods. There's no motor shutdown, but we suspect that it's dropping one PWM cycle during this burst and so we lose that Hall state.
The new hardware guy noticed that DC_CAL is left floating and not tired to ground. We'll fix that next spin, but could that possibly cause what we're seeing? The DRB8301 has an internal pulldown so I wouldn't think this was the issue..
All help, manual references, recommended reading appreciated!
Ed Averill