Just confirmed the pinout:
1. V_a (bigger pad)
2. V_b (bigger pad)
3. V_c (bigger pad)
4. GND (conveniently provides a little noise isolation)
5. V_hall_1
5. V_hall_2
6. V_hall_3
7. PWR (e.g. 5V)
The hall sensor is from TI on this motor, not Allegro. The markings read +NLAG...