Sa and Sb could be used for current or voltage feedback but if you're looking for the simplest implementation you'd just tie them to GND.
Setting InA or InB high gives you forward or reverse, setting both high gives you coast, setting both low gives you brake. Using PWM should give you varying levels of each.
VDD is your motor power but it also provides power for the chip logic.
Thanks. I'm not familiar with those feedback pins. I won't need them, so with tie them to ground.
So, Vdd will be 12 volts, as my motor is 12 volts, but I won't need any logic level shifting to run the signal IN pins from a pro mini 5 volt?
The data sheet says,
Input Voltage High (VINH) minimum is 2 volt, so I guess I could even use this with the 3.3V pro mini?