There's one more question I want to ask.
It is on your official evalution board, The HPx is connected to the DVDD by pull-up resistor, and the HNx is connected to the DVDD/2 by divider resistor.(single-ended Halls signals)
For me, I connected the HPx to the DVDD by pull-up resistor too, but I connected the HNx directly to GND.
Is there any problem with this connection ?
Is it possible that because of this connection caused the motor can not start with load?