Digilent 410-259P Manual do Utilizador descarregar pdf

™

Revision: February 4, 2013

Note: This document applies to REV A of the board.

1300 NE Henley Court, Suite 3

Pullman, WA 99163

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Doc: 502-259 page 1 of 3

Overview

The PmodDHB1 uses the Texas Instruments

DRV8833 dual H-Bridge motor driver chip to

drive two DC motors or one stepper motor.

Features include:

• Motor voltage can be driven up to

11.8V, with a recommended 10.8V

maximum

• Two H-Bridge interfaces capable of

1.5A RMS (2A Peak)

• 2-channel quadrature encoder

channels for Hall-effect sensors

• Two JST 6-pin connectors for direct

connection to Digilent motor-gearboxes

• Logic input voltage range of 2.5V to 5V

Functional Description

For a detailed description of the Texas

Instruments DRV8833 please refer to the

device data sheet available at TI.com.

The DHB1 is controlled through the Pmod

connector J1. Logical levels on ENx and DIRx

determine the Motor Direction and speed of the

attached motors. The DHB1 uses a

demultiplexer and pull-down resistors on the

inputs to the DRV8833 H-Bridge pins to ensure

that the H-Bridge works in fast decay mode.

The intended operation of the DHB1 uses the

enable pin as the PWM input and the direction

pin as a logic level selector to set the direction

of the motor rotation. Table 1 lists the motor

responses that result from various input

combinations.

The DRV8833 chip provides overcurrent

protection on the motor drive circuits. Each

internal drive FET is independently monitored

for an overcurrent condition and will be shut

down internally to protect the chip. When an

overcurrent condition is sensed the chip will

shut down the FET with the fault and then set

the NFAULT pin low signaling a fault condition

on the chip. The remaining FETs will continue

to operate as normal. When the fault condition

is over, the chip will self-reset and return the

NFAULT logic level to logic high. (See Table 2

for connector descriptions.)

There are two Schmitt trigger buffered inputs

on connectors J2, J3, J7 and J8 that bring

motor speed feedback signals to the controlling

system board. The Digilent motor and gearbox

have hall-effect sensors arranged in a

quadrature encoder format. These buffers

have 5V tolerant inputs, when operated at

3.3V.

DIR1

Result

0 0 Stop

0 1/PWM

Forward

1 0 Stop

1 1/PWM

Reverse

DIR

Result

0 0 Stop

0 1/PWM

Forward

1 0 Stop

1 1/PWM

Reverse

Table 1: Motor Control

1 2 3

Resumo do Conteúdo

Página 1 - Functional Description

PPmmooddDDHHBB11™™ RReeffeerreennccee MMaannuuaall Revision: February 4, 2013 Note: This document applies to REV A of the board. 1300 NE Henley C

Página 2 - Jumper Settings

PmodDHB1™ Reference Manual ® www.digilentinc.com www.digilentinc.com Copyright Digilent, Inc. page 2 of 3 The quadrature encoder signals are

Página 3 - PmodDHB1™ Reference Manual

PmodDHB1™ Reference Manual ® www.digilentinc.com www.digilentinc.com Copyright Digilent, Inc. page 3 of 3 Figure 1.) Figures 2 and 3 repres

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