Texas Instruments DRV8834EVM Bedienungsanleitung
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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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DRV8834 Evaluation Module
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
M1
GND
AVREF
J3
ADECAY
nENBL /AENBL
BVREF
VDD
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Block Diagram
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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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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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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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GUI Software Installation
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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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