Information

Digilent Pmod™ Interface Specification
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N/S - not-specified, depending on the module, these pins may be unconnected or additional
module specific inputs or outputs.
Pmod Interface Type 5 (H-Bridge)
This interface provides for controlling a single H-Bridge with motor speed sensing feedback. The
DIR pin sets the rotational direction of the motor. The EN signal is pulse width modulated to
control the effective voltage applied to the motor. EN is an active high signal, i.e. a high logic level
enable current flow through the bridge. The SA and SB signals are quadrature encoder feedback
signals used to sense the motor speed. These are square wave signals, whose frequency is
proportional to motor rotational speed and that are in quadrature. (i.e. 90° out of phase).
Pin Signal Direction
1 DIR Out
2 EN Out
3 SA In
4 SB In
5 GND
6 VCC
DIR - Motor direction
EN - Motor enable, active high
SA - feedback sense A
SB - feedback sense B
Pmod Interface Type 6 (dual H-Bridge)
This interface provides for controlling two independent H-Bridges. This can be used to control two
brushed DC motors, or the two phases of a bi-polar stepper motor.
Pin Signal Direction
1 DIR1 Out
2 EN1 Out
3 DIR2 Out
4 EN2 Out
5 GND
6 VCC
DIR1 - Motor/Phase 1 direction
EN1 - Motor/Phase 1 enable, active high
DIR2 - Motor/Phase 2 direction
EN2 - Motor/Phase 2 enable, active high