Pololu Dual MC33926 - Manual (Page 18)

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 require. For
example, alkaline cells are typically poor choices for high-current applications, and you should almost never use
a 9V battery (the rectangular type with both terminals on the same side) as your motor power supply.
Logic power at the same level as your controlling device should be supplied to the VDD pin. This will typically
be between 2.5 and 5 V.
Please see the MC33926 datasheet and Section 3.c for more power considerations and for information about
shield power dissipation.
Pololu Dual MC33926 Motor Driver Shield User's Guide © 2001–2013 Pololu Corporation
4. Using as a General-Purpose Motor Driver Page 18 of 24