Texas Instruments DRV8834EVM Manuel utilisateur

SLVU701B–March 2012–Revised July 2019

DRV8834 Evaluation Module

User's Guide

SLVU701B–March 2012–Revised July 2019

DRV8834 Evaluation Module

This document is provided as a supplement to the DRV8834 datasheet. It details the hardware

implementation of the DRV8834 customer evaluation module (EVM).

Contents

1 Introduction ................................................................................................................... 2

2 Block Diagram................................................................................................................ 2

2.1 Power Connectors.................................................................................................. 3

2.2 Test Stakes.......................................................................................................... 3

2.3 Jumpers.............................................................................................................. 4

2.4 Switches ............................................................................................................. 4

2.5 Motor Outputs ....................................................................................................... 4

3 GUI Software Installation .................................................................................................. 4

3.1 System Requirements.............................................................................................. 4

3.2 Installation Procedure .............................................................................................. 4

4 The Windows Application ................................................................................................. 15

4.1 Dual H Bridge Mode .............................................................................................. 16

4.2 The CONFIG Control Signal..................................................................................... 18

4.3 Configuring Switches ............................................................................................. 18

4.4 Menu Options ..................................................................................................... 19

4.5 DRV8834 GPIO Control Signals ................................................................................ 20

4.6 Updating DAC Output for Current Control (VREF) ........................................................... 20

4.7 Stepper Control.................................................................................................... 21

4.8 Move Steps Frame................................................................................................ 22

5 Schematics and Bill of Materials ......................................................................................... 24

5.1 Schematics......................................................................................................... 24

5.2 Bill of Materials .................................................................................................... 26

Trademarks

Windows is a registered trademark of Microsoft corporation.

All other trademarks are the property of their respective owners.

VM Power

DRV8834

Motor Outputs

USB

Conn USB Chip

MSP430

BDECAY

Config

Switch

3.3V LDO

Test

Points

ADECAY

Config

Switch

BVREF

Config

Switch

AVREF

Config

Switch

Introduction

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1 Introduction

The DRV8834 customer EVM is a platform revolving around the DRV8834, a low voltage dual H-bridge

driver and highly configurable power stage. This device has been optimized to drive either two brushed

DC motors, a single bipolar stepper with up to 32 degrees of internally generated microstepping, or a

single bipolar stepper with high resolution externally generated microstepping. In this EVM, high resolution

is meant to imply 512 degrees of microstepping, but higher resolution, as given by any given DAC

resource, can be implemented.

The EVM houses an MSP430 microcontroller and an USB interface chip. The USB chip allows for serial

communications from a PC computer where a Windows®application is used to schedule serial

commands. These commands can be used to control each of the device’s signals, or control both devices

at the same time to drive a stepper motor.

The microcontroller firmware operates in one of three modes. Each of the three modes can be selected

through the Windows application by choosing the respective operation TAB. The three modes are:

• Dual H-Bridge with independent current control and PWM control on the ENABLE and PHASE lines.

• Internal indexer microstepping driver capable of supplying up to 32 degrees of microstepping to a

single bipolar stepper motor.

• Dual H-Bridge configured to supply up to 512 degrees of microstepping to a single bipolar stepper

motor.

This user's guide details the operation of the EVM in any of the three modes, as well as the hardware

configurability of the evaluation module.

2 Block Diagram

M0/APHASE

nSLEEP

nFAULT

BDECAY

DIR/BPHASE

STEP/BENBL

CONFIG

GND

AVREF

ADECAY

nENBL /AENBL

BVREF

VDD

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Block Diagram

SLVU701B–March 2012–Revised July 2019

DRV8834 Evaluation Module

2.1 Power Connectors

The DRV8834EVM offers access to VM (motor voltage) power rail via a terminal block (J1). A set of test

clips in parallel with the terminal block allows for the monitoring of the input power rail.

User must apply VM according to datasheet recommended parameters.

NOTE: VDD for logic and microcontroller is derived from a provided 3.3-V regulator stepped down

from the VM input voltage.

2.2 Test Stakes

A 0.100 inch pitch header connector (J3) is used to provide access to every device signal in the event a

different microcontroller is to be employed. To disconnect the internal MSP430 microcontroller, simply

remove power to this resource by removing the shunt from the JP3 jumper.

Figure 1. J3 Connector

Block Diagram

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2.3 Jumpers

The DRV8834EVM module contains three 2-pin jumpers which the user can remove in order modify

certain aspects of configuration.

• JP1: Place a shunt to enable the D1 LED signaling of any fault occurrence.

• JP3: Place a shunt to allow 3.3-V supply to the microcontroller. Remove the shunt to disable MSP430

microcontroller and use external microcontroller of choice.

• JP4: Place a shunt to provide VM power to the LDO. Remove to disconnect all VM loading except

DRV8834 device.

2.4 Switches

A series of switches allow the proper selection of analog input to configure the reference voltage and

decay set points.

Table 1. Switches

SWITCH NAME DESCRIPTION

BDECAY SEL Selects Decay B source to be MSP430 GPIO (only HI or LO), externally

supplied or derived from the R1 potentiometer.

ADECAY SEL Selects Decay A source to be MSP430 GPIO (only HI or LO), externally

supplied or derived from the R2 potentiometer.

BVREF SEL Selects Reference Voltage B source to be same as VREFA (used on internal

indexer mode), MSP430 DAC, externally supplied or derived from the R7

potentiometer.

AVREF SEL Selects Reference Voltage A source to be MSP430 DAC, externally supplied or

derived from the R6 potentiometer.

Each switch position is properly documented on the board’s top layer overlay silk screen.

2.5 Motor Outputs

There are two ways of connecting the dual brushed DC motor or the single bipolar stepper motor into the

DRV8834 evaluation module: four pin header (J2) or four position terminal block (J4).

3 GUI Software Installation

The following section explains the location of files and the procedure for installing the software correctly.

NOTE: Ensure that no USB connections are made to the EVM until the installation is completed.

The installer will also install LabVIEW RTE 2014 and FTDI Driver, along with the GUI.

3.1 System Requirements

• Supported OS – Windows 7 (32 Bit, 64 Bit). The window text size should be Smaller-100% (Default)

• Recommended RAM - 4 GB or higher

• Recommended CPU Operating Speed – 3.3 GHz or higher

3.2 Installation Procedure

The following procedure helps you install the DRV8834 GUI

1. Double click on the Setup_DRV8834_EVM.exe as shown in Figure 2.

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GUI Software Installation

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DRV8834 Evaluation Module

Figure 2. Setup_DRV8834_EVM.exe

2. The screen shown in Figure 3 appears, indicating installer initialization. Click the Next button.

Figure 3. Installation Initialization

3. In the newly open installation pop-up window, click Next. The license agreement will be displayed.

Please, read through it carefully and enable the "I Accept the Agreement" radio button and press Next.

GUI Software Installation

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Figure 4. License Agreement

4. A screen as shown in Figure 5 appears, displaying the license agreement of National Instruments.

Please read through the agreement carefully and enable the “I Accept the License Agreement” radio

button and press the Next button.

Figure 5. NI License Agreement

5. Set the default directory for the GUI Installation and click Next.

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GUI Software Installation

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DRV8834 Evaluation Module

Figure 6. Installation Directory Screen

NOTE: It is highly recommended to keep the default values as provided in the installer.

6. A screen as shown in Figure 7 appears. This screen is to select the components to install. Select the

Components to Install and Click Next to continue installation. The LabVIEW RTE component checks

out if the LabVIEW RTE 2014 is already installed on the PC.

Figure 7. Component Selection

7. If LabVIEW RTE is selected as a component to install, a screen appears as shown in Figure 8.

Configure the proxy settings as required. This screen is to download the LabVIEW RTE 2014 from

ni.com, Click Next to continue the installation.

GUI Software Installation

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Figure 8. Configure Proxy

8. A screen as shown in Figure 9appears. Click Next to begin the installation.

Figure 9. Ready to Install

9. If the LabVIEW RTE 2014 is selected as a component to install, LabVIEW RTE downloads and

performs a silent mode installation.

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DRV8834 Evaluation Module

Figure 10. Downloading RTE

10. Once the download completes, LabVIEW begins with the self-extraction as shown in Figure 11.

Figure 11. LabVIEW RTE Self Extraction

11. A screen appears as shown in Figure 12. It initializes the LabVIEW RTE Installation.

GUI Software Installation

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Figure 12. LabVIEW RTE Installation Initialization

12. A display as shown in Figure 13 appears which indicates the progress of LabVIEW RTE installation.

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