H-Bridge pins - use two or three?

Other Hardware Motors, Mechanics, Power and CNC
1

Hello,

I have a simple little bot, and am using two H-Bridges (on a [SN754410) to control the wheels.

Therefore, I am currently using three pins to control each wheel, "EN" for pwm, and then "A" and "B" for direction.

The thing is, I'm not doing anything fancy with the wheels, so can I just use EN and A, and then an inverter to invert A into B?](http://focus.ti.com/lit/ds/symlink/sn754410.pdf)

2

Yes but you only get free wheeling breaking when you stop the motor. When you put both A & B to the same logic level you get flywheel breaking which means the motor stops a lot quicker.

3

I see. I may keep them then, I have enough pins (at the moment).