Datasheet

1300 Henley Court

Pullman, WA 99163

509.334.6306

www.digilentinc.com

PmodHB5™ Reference Manual

Revised April 12, 2016

This manual applies to the PmodHB5 rev. E

DOC#: 502-106

Other product and company names mentioned may be trademarks of their respective owners.

Page 1 of 3

Overview

The Digilent PmodHB5 offers a 2A H-bridge circuit to drive small to medium sized DC motors. This module was

specifically designed to work with the Digilent gearbox motor, which incorporates quadrature encoder feedback.

1 Functional Description

The PmodHB5 utilizes a full H-Bridge circuit to allow users to drive DC motors from the system board. Two sensor

feedback pins are incorporated into the motor connection header and are specifically designed to work with

the Digilent motor/gearbox.

2 Interfacing with the Pmod

The PmodHB5 communicates with the host board via the GPIO protocol. Like all H-Bridges, care must be taken to

avoid causing a potential short within the circuitry. In terms of this Pmod, this means that the Direction pin must

not change state while the Enable pin is at a high voltage state. If this does occur, one set of switches that are

driving the motor will be closing while the other set is opening, allowing for the possibility for both sets of switches

to be open at the same time, creating a short.

The PmodHB5.

 2A H-bridge circuit

 Drive a DC motor with operating voltage up

to 12V

 6-pin JST connector for direct connection to

Digilent motor/gearboxes

 Two screw terminals for external motor

power supply

 Small PCB size for flexible designs 1.2 in ×

0.8 in (3.0 cm × 2.0 cm)

 6-pin Pmod port with GPIO interface

 Follows Digilent Pmod Interface

Specification Type 5

 Libraries and example code available

in resource center

Features include:

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300 Henley Court Pullman, WA 99163 509.334.6306 www.digilentinc.com PmodHB5™ Reference Manual Revised April 12, 2016 This manual applies to the PmodHB5 rev. E Overview The Digilent PmodHB5 offers a 2A H-bridge circuit to drive small to medium sized DC motors. This module was specifically designed to work with the Digilent gearbox motor, which incorporates quadrature encoder feedback. Features include:        The PmodHB5.
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PmodHB5™ Reference Manual To drive the motor at a specific speed, users will need to choose a static direction (forwards or backwards corresponding to high or low voltage) on the Direction pin, and then perform pulse width modulation on the Enable pin. The more often that an enable pin is driven high within a set time frame, the faster the DC motor will spin. The way that this works is that when voltage is being applied, the motor is driven by the changing magnetic forces.
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PmodHB5™ Reference Manual Any external power applied to the PmodHB5 must be within 2.7V and 5.25V; however, it is recommended that Pmod is operated at 3.3V. 3 Physical Dimensions The pins on the pin header are spaced 100 mil apart. The PCB is 1.2 inches long on the sides parallel to the pins on the pin header and 0.8 inches long on the sides perpendicular to the pin header. Copyright Digilent, Inc. All rights reserved.