Simplified Motor Control Truth Table
Inputs
Outputs
D2 MxPWM MxDIR MxA MxB SF
Mode
H
H
L
H
L
H
forward
H
H
H
L
H
H
reverse
H
L
X
L
L
H
brake
L
X
X
Z
Z
L
coast
L = LOW, H = HIGH, X = HIGH or LOW, Z = high impedance
The above table assumes there are currently no driver faults.
Power Considerations
Dual MC33926 motor driver shield power buses when not used with an
Arduino.
The shield must be supplied with 5 to 28 V through the large VIN and GND pads on the right side of
the board. A high-side reverse-voltage protection MOSFET prevents the shield from being damaged if
shield power is inadvertently connected backwards.
It is important that you use a power source that is capable of delivering the current your motors will
Pololu Dual MC33926 Motor Driver Shield User’s Guide
© 2001–2017 Pololu Corporation
4. Using as a General-Purpose Motor Driver
Page 24 of 30
