Texas Instruments DRV8811 User manual

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User's Guide
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This document is provided as a supplement to the DRV8811 datasheet. It details the hardware
implementation of the DRV8811 customer evaluation module (EVM).
Contents
1 Introduction ................................................................................................................... 3
1.1 Block Diagram....................................................................................................... 3
1.2 Power Connectors.................................................................................................. 3
1.3 Test Stakes.......................................................................................................... 3
1.4 Jumpers.............................................................................................................. 4
1.5 Motor Outputs ....................................................................................................... 4
2 Installing Drivers And Software ............................................................................................ 4
2.1 Installing the FTDI USB Driver.................................................................................... 4
2.2 GUI Software Installation .......................................................................................... 4
2.3 Running the Windows Application Software................................................................... 15
3 Windows Application....................................................................................................... 15
3.1 Menu................................................................................................................ 17
3.2 DRV8811 GPIO Control Signals ................................................................................ 18
3.3 Updating DAC Output for Current Control (VREF/DECAY) ................................................. 19
3.4 Updating DAC Output for Decay Control (DECAY)........................................................... 19
3.5 Operating the Stepper Motor .................................................................................... 20
List of Figures
1 VREF SELECT Jumper..................................................................................................... 4
2 DECAY SELECT Jumper................................................................................................... 4
3 Setup_DRV8811_EVM.exe................................................................................................. 5
4 Installation Initialization ..................................................................................................... 6
5 License Agreement.......................................................................................................... 6
6 NI License Agreement ...................................................................................................... 7
7 Installation Directory Screen ............................................................................................... 7
8 Component Selection ....................................................................................................... 8
9 Configure Proxy.............................................................................................................. 8
10 Ready to Install .............................................................................................................. 9
11 Downloading RTE ........................................................................................................... 9
12 LabVIEW RTE Self Extraction............................................................................................ 10
13 LabVIEW RTE Installation Initialization ................................................................................. 10
14 Installation of LabVIEW RTE in Progress............................................................................... 11
15 FTDI Installation Initialization ............................................................................................. 12
16 Driver Installation Wizard.................................................................................................. 12
17 License Agreement for FTDI Driver...................................................................................... 13
18 Driver Installation Completion ............................................................................................ 14
19 Installation Complete ...................................................................................................... 14
20 Readme Window........................................................................................................... 15
21 DRV8811EVM-001_R1p0.exe Main Screen............................................................................ 16

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22 File Menu.................................................................................................................... 17
23 Debug Menu ................................................................................................................ 17
24 Schematic ................................................................................................................... 17
25 Help Menu .................................................................................................................. 18
26 About Page ................................................................................................................. 18
27 Signals Frame .............................................................................................................. 19
28 Curent Control Frame ..................................................................................................... 19
29 Current Control Frame..................................................................................................... 20
30 Step Rate ................................................................................................................... 20
31 Speed Control Frame...................................................................................................... 21
32 Step Control Frame ........................................................................................................ 21
Trademarks
All trademarks are the property of their respective owners.

VM Power
Test Stakes
DRV8811
Motor Outputs
MSP430F1612USB
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1 Introduction
The DRV8811EVM-001 customer EVM is the complete solution to evaluating the DRV8811 microstepping
bipolar stepper driver. It houses a USB link to provide easy control from a PC computer, an MSP430
microcontroller that interprets serial commands from the PC and generates control signals to the driver
device, and the DRV8811 device with access to all signals for a complete evaluation.
1.1 Block Diagram
1.2 Power Connectors
The DRV8811 customer EVM uses a combination of terminal blocks and test clips for the
application/monitoring of power. The only power rail the user must supply is VM for the device’s power
stage. VDD for logic levels is internally generated from the USB connection.
The user must apply VM according to datasheet recommended parameters.
1.3 Test Stakes
Every pin on the device has been brought out to a test stake. A label on the silkscreen identifies each
signal.

(a) (b)
POT INT POT INT
(a) (b)
POT INT POT INT
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1.4 Jumpers
Three pin jumpers can be configured independently from the other two or three pin jumpers. However, two
pin jumpers must either be closed or open. Two pin jumpers (JP2 to JP5) connect the diodes to the motor
outputs and are used under asynchronous rectification (SR = LO).
1.4.1 VREF SELECT (JP1) Jumper
Figure 1. VREF SELECT Jumper
To configure the VREF SELECT jumper: Figure 1 (a) selects an analog voltage derived from VDD through
a voltage divider implemented as a potentiometer R4. Figure 1 (b) selects an analog voltage derived from
the MSP430’s digital to analog converter channel 0 (DAC0).
1.4.2 DECAY SELECT (JP6) Jumper
Figure 2. DECAY SELECT Jumper
To configure the DECAY SELECT jumper: Figure 2 (a) selects an analog voltage derived from VDD
through a voltage divider implemented as a potentiometer R6. Figure 2 (b) selects an analog voltage
derived from the MSP430’s digital to analog converter channel 1 (DAC1).
1.5 Motor Outputs
There are three ways of connecting the bipolar stepper motor into the DRV8811 EVM: four pin header
(J2), four position terminal block (J3) or test clips. Each connection style offers identical connectivity to the
device’s output terminals. It is recommended, however, to use the header or terminal block, as the test
stakes traces are of low current handling capability.
2 Installing Drivers And Software
2.1 Installing the FTDI USB Driver
Instructions on how to install the FTDI USB driver on a Windows based computer are detailed in the
“USB_Drivers_Install_Readme.pdf” file supplied with the CD inside the USB_Driver folder.
2.2 GUI Software Installation
The following section explains the location of files and the procedure for installing the software correctly.

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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.
2.2.1 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
2.2.2 Installation Procedure
The following procedure helps you install the DRV8811 GUI
1. Double click on the Setup_DRV8811_EVM.exe as shown in Figure 3.
Figure 3. Setup_DRV8811_EVM.exe
2. The screen shown in Figure 4 appears, indicating installer initialization. Click the Next button.

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Figure 4. 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.
Figure 5. License Agreement
4. A screen as shown in Figure 6 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.

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Figure 6. NI License Agreement
5. Set the default directory for the GUI Installation and click Next.
Figure 7. 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 8 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.

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Figure 8. Component Selection
7. If LabVIEW RTE is selected as a component to install, a screen appears as shown in Figure 9.
Configure the proxy settings as required. This screen is to download the LabVIEW RTE 2014 from
ni.com, Click Next to continue the installation.
Figure 9. Configure Proxy
8. A screen as shown in Figure 10 appears. Click Next to begin the installation.

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Figure 10. 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.
Figure 11. Downloading RTE
10. Once the download completes, LabVIEW begins with the self-extraction as shown in Figure 12.

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Figure 12. LabVIEW RTE Self Extraction
11. A Screen appears as shown in Figure 13. It initializes the LabVIEW RTE Installation.
Figure 13. LabVIEW RTE Installation Initialization
12. A display as shown in Figure 14 appears which indicates the progress of LabVIEW RTE installation.

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Figure 14. Installation of LabVIEW RTE in Progress
13. Once the LabVIEW RTE 2014 is installed, DRV 8811 EVM GUI component installs.
14. After DRV8811 Installation, FTDI Installation begins. A screen as shown in Figure 15 appears, click
Extract to proceed.

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Figure 15. FTDI Installation Initialization
15. A screen as shown in Figure 16 appears, click Next to proceed.
Figure 16. Driver Installation Wizard

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16. The License Agreement appears on screen as shown in Figure 17.
17. Read through the License Agreement carefully and enable the “I Accept this Agreement” radio button
and Click on Next.
Figure 17. License Agreement for FTDI Driver
18. Click Finish to complete the Driver Installation.

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Figure 18. Driver Installation Completion
19. Figure 19 appears denoting the completion of DRV8811 EVM GUI Installation. Click Finish.
Figure 19. Installation Complete
20. A Readme window as shown in Figure 20 appears displaying the link for LV 2014 RTE.

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Figure 20. Readme Window
WARNING
The DRV8811 EVM GUI requires the LabVIEW Run-Time Engine
2014 to be installed before the GUI executes. Please note the
application is not compatible with other versions of LabVIEW
Runtime Engine.
You can download National Instruments LabVIEW Run-Time Engine 2014
from the below link:
LabVIEW Run-Time Engine 2014
NOTE: DRV8811 EVM GUI executable has been built in LabVIEW 2014 (32-bit) version, and it
expects the LabVIEW Run-Time Engine version to be LabVIEW Run-Time Engine (32-bit
version).
2.3 Running the Windows Application Software
To run the application, search for the desktop shortcut of the application or search for the DRV8811EVM
GUI in your Programs or its installation directory.
3 Windows Application
The DRV8811 Windows Application is the software counterpart for the DRV8811 EVM. It is in charge of
connecting to the MSP430 microcontroller via a USB connection which in turn selects the proper logic
state for the DRV8811 control signals.
The graphical user interface (GUI) has been designed to allow for all of the DRV8811 device’s
functionality to be tested without having to intervene with the hardware, except for the proper configuration
of jumpers when needed.

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Figure 21 shows the GUI main screen. It contains menu items to configure and enable/disable the serial
port, frames with GPIO control for the DRV8811 control signals, stepper motor control for start/stop and
speed, and current/decay control through the MSP430 DACs.
Figure 21. DRV8811EVM-001_R1p0.exe Main Screen

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3.1 Menu
• File - The File menu contains the option Exit as shown in Figure 22 below.
Figure 22. File Menu
• Debug - The Debug option can be used for the following operations.
Figure 23. Debug Menu
•– Demo - By selecting the Demo in the submenu, the GUI runs in simulation mode, and by
unselecting it, the GUI runs in connected mode.
– Log to File - The log to file submenu is used to log the GUI activities to a log file that is specified.
– Debug log - The Debug log option enables to log all the activities of the user. If that is not selected,
only the high-level operations log.
• View - Select View-> Schematics->DRV8811 to view the GUIs schematics
Figure 24. Schematic

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• Help
– Clicking the About in the Help Menu
Figure 25. Help Menu
– The About Page provides the details like the Name of the GUI, GUI version, Supported OS and
Copyright Information.
Figure 26. About Page
3.2 DRV8811 GPIO Control Signals
Once the application is communicating with the interface board, the control signals can be actuated by
checking or un-checking check boxes on the Signals frame.

VREF = DAC_VALUE ·
2.5 V
¾
4095
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Figure 27. Signals Frame
A checked checkbox translates to a HI level on the respective control signal. A un-checked checkbox
translates to a LO level on the respective control signal.
3.3 Updating DAC Output for Current Control (VREF/DECAY)
If the DRV8811 EVM has been configured to accept VREF analog voltages through the MSP430
microcontroller interface (JP1 is set to INT), then the slider bar on the Current Control frame can be used
to set the VREF voltage.
Figure 28. Curent Control Frame
The MSP430F1612 12-bit DAC channel 0 is connected to the DRV8811 VREF analog input. Changing the
DAC digital value from 0 to 4095, changes the analog voltage at the VREF/DECAY pin from 0 V to 2.5 V
respectively. See Equation 1.
(1)
Where VREF is the output voltage and DAC_VALUE is a number from 0 to 4095.
3.4 Updating DAC Output for Decay Control (DECAY)
If the DRV8811 EVM has been configured to accept DECAY analog voltages through the MSP430
microcontroller interface (JP6 is set to INT), then the slider bar on the Current Control frame can be used
to set the DECAY voltage.

Time
Base
Accel Rate
Pulses Per Second
DECAY = DAC_VALUE ·
2.5 V
¾
4095
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Figure 29. Current Control Frame
The MSP430F1612 12 bit DAC channel 1 is connected to the DRV8811 DECAY analog input. Changing
the DAC digital value from 0 to 4095, changes the analog voltage at the DECAY pin from 0 V to 2.5 V
respectively. See Equation 2.
(2)
Where DECAY is the output voltage and DAC_VALUE is a number from 0 to 4095.
3.5 Operating the Stepper Motor
3.5.1 Turning the Stepper Motor
The Windows Application, in conjunction with the MSP430F1612 microcontroller, utilizes a series of timers
to coordinate the rate of steps sent to the device. Once all the control signals are configured accordingly
(ENABLEn = LO, SLEEPn = HI, RESETn = HI; DIR, USM0 and USM1 can be HI or LO depending on
preferred mode of operation; SRn must be L, if external diodes are not populated), the motor is ready to
be turned.
The DRV8811EVM-001 customer EVM allows for the possibility of coordinating step rates such that
accelerating and decelerating profiles are achieved. Both acceleration and deceleration are controlled by
the same parameters, acceleration rate and time base.
When the motor starts, it always starts at the slowed pulses per second (PPS) speed (62 pulses per
second). The controller will accelerate the motor in order to reach the PPS speed. Acceleration rate is an
8-bit number (0 to 255) that gets added to the current PPS speed and time base is an 8-bit number (0 to
255) that specifies how many milliseconds will elapse from one speed increase to the next. Once the
specified PPS speed has been achieved, the acceleration stops.
Figure 30. Step Rate