Texas Instruments DRV884 EVM Series User manual

User’s Guide
DRV884xEVM User's Guide
ABSTRACT
This document is the user's manual for the DRV8845 and DRV8849 evaluation module (EVM) and the GUI to
control the EVM. The DRV8845EVM allows for control and evaluation of the DRV8845 which is a dual stepper
or four brushed motors driver. The DRV8849EVM allows for the evaluation of DRV8849 which is dual stepper
driver. This manual provides a detailed overview of the hardware features and how to use the included GUI to
control the both DRV8845EVM and DRV8849 EVM.
CAUTION
Hot surfaces on the EVM include the driver device (U5) and the area surrounding it. When operating
the EVM at the maximum device specifications and a high ambient temperature, external cooling
fans may be required to minimize potential fire hazard, personal injury, or both.
Table of Contents
1 Introduction.............................................................................................................................................................................3
1.1 DRV8845 Quad H-bridge motor driver ...........................................................................................................................3
1.2 DRV8849 Dual Stepper driver .........................................................................................................................................3
2 Jumpers Table and Setup...................................................................................................................................................... 4
3 Software Setup........................................................................................................................................................................6
4 Cloud-based GUI.....................................................................................................................................................................7
5 Local Installation.....................................................................................................................................................................8
6 Hardware Setup.......................................................................................................................................................................9
7 Launching the DRV884x-EVM-GUI Application..................................................................................................................10
8 GUI Operations DRV8845.....................................................................................................................................................12
9 GUI Operations DRV8849.....................................................................................................................................................15
10 Updating Firmware............................................................................................................................................................. 17
11 Revision History..................................................................................................................................................................18
List of Figures
Figure 2-1. DRV8845EVM Jumper Population Guide ............................................................................................................. 4
Figure 2-2. DRV8849EVM Jumper Population Guide ............................................................................................................. 4
Figure 3-1. FET Drivers Product Download List ..................................................................................................................... 6
Figure 4-1. TI GUI Composer Results for Launching or Downloading Local Installer ........................................................7
Figure 6-1. DRV8845EVM motor connectors ...........................................................................................................................9
Figure 6-2. VM power connector .............................................................................................................................................. 9
Figure 7-1. DRV884x-EVM GUI Home Screen ........................................................................................................................10
Figure 7-2. Successful EVM Connection ...............................................................................................................................10
Figure 7-3. Serial Port Configuration ..................................................................................................................................... 11
Figure 7-4. DRV884x-EVM GUI Navigation ............................................................................................................................ 11
Figure 8-1. Stepper Control in DRV8845-EVM-GUI ...............................................................................................................12
Figure 8-2. Dual Stepper Control in DRV8845-EVM-GUI ...................................................................................................... 13
Figure 8-3. Parallel Mode Jumpers ........................................................................................................................................ 14
Figure 8-4. Brushed DC Motor Control in DRV8845-EVM-GUI .............................................................................................14
Figure 9-1. Stepper Control in DRV8849-EVM-GUI ...............................................................................................................15
Figure 9-2. Decay Modes in DRV8849-EVM-GUI ................................................................................................................... 16
Figure 10-1. EVM Firmware Update Pop-up .......................................................................................................................... 17
Figure 10-2. Update Firmware ................................................................................................................................................ 17
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List of Tables
Table 2-1. Jumper Identification Table......................................................................................................................................... 4
Table 11-1. Revision History...................................................................................................................................................... 18
Trademarks
All trademarks are the property of their respective owners.
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1 Introduction
1.1 DRV8845 Quad H-bridge motor driver
The DRV8845 is a quad full-bridge driver for a wide variety of industrial applications. The device can be used for
driving up to two stepper motors or up to four brushed-DC motors. Each full-bridge output is rated up to 1.5 A
and 38 V. The DRV8845 includes pulse width modulation (PWM) current regulators, along with 2- bit nonlinear
DACs (digital-to-analog converters) that allow stepper motors to be controlled in full, half, and quarter steps; and
DC motors in forward, reverse, and coast modes.
This driver offers Smart tune decay mode for smooth and quiet operation. Protection features in this driver
include thermal shutdown with hysteresis (OTSD), undervoltage lockout (UVLO) and overcurrent protection
(OCP).
1.2 DRV8849 Dual Stepper driver
The DRV8849 is a dual stepper motor driver for industrial and consumer applications. The device is fully
integrated with four N-channel power MOSFET H-bridge drivers, one microstepping indexer for each stepper,
and integrated current sensing. The DRV8849 is capable of driving up to 1.5-A (limited by board design). The
DRV8849 uses STEP/DIR interface to control the direction and step rate of the stepper motor.
Protection features are provided for supply undervoltage, charge pump faults, overcurrent, short circuits, and
overtemperature.
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2 Jumpers Table and Setup
The jumpers for the DRV8845EVM Figure 2-1 and DRV8849EVM Figure 2-2 are identical except for J5 and J13
and the below figures can be referred to for proper connection.
Figure 2-1. DRV8845EVM Jumper Population Guide
Figure 2-2. DRV8849EVM Jumper Population Guide
Table 2-1. Jumper Identification Table
Jumpers DRV8845EVM/DRV8849EVM
J1-J4 OUT1A, OUT1B – OUT4A, OUT4B
J5 Connect VREF1 with VREF 3 and VREF2 with VREF4 for
DRV8845EVM
Leave unconnected for DRV8849EVM
J6 Push button to reset MCU
J7 MCU to DRV signals
J8 VM
J10 EZ FET communication jumpers
J11 Micro USB connection
J13 Jumpers for parallel drive
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Note that the labels for Jumpers J5 and J7 are separated with a “/” where the left label corresponds to DRV8845
and the right one corresponds to DRV8849.
For more detailed information download the hardware files and schematics. Once you have verified that all
shunts and jumpers are in the correct location you can move on to hardware setup.
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3 Software Setup
1. Install the TI MSP430 USB driver from MSP430 FET Drivers.
a. Click on the driver download link highlighted in the image below.
b. Please login with your myTI credentials when prompted and provide the requested information. The
approval to access the download is automatic and immediate as long as the U.S. Government export
approval requirements are complied with
Figure 3-1. FET Drivers Product Download List
c. Click on the download button to download the installer to your PC.
d. Double click on the downloaded zip file and run the installer by double clicking on the “.exe” file.
i. Complete the installation.
ii. The required USB drivers to use the EVM are installed in your PC.
iii. Please follow proper safety precautions working with sensitive electronics as well as high voltage
and high current hardware.
iv. Power sequencing: The USB cable must be plugged in first between the EVM and the computer.
Then turn on the power supply to the EVM. Powering the EVM external bench supply before
connecting the USB cable can cause the USB device to not start up properly and result with driver
error.
v. Setup the bench supply to 12 V with current limit set to appropriate requirements of the motor.
vi. The computer then recognizes the USB device is connected and enumerates as serial ports in the
system as shown below. The COMxx numbers can vary according to your system.
vii. Login to https://dev.ti.com/gallery/ using your myTI login credentials. Please note the GUI composer
login looks for a very specific username match including case input at the time of sign up.
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4 Cloud-based GUI
1. Search for “DRV884xEVM-GUI”.
2. When presented with the list of available GUIs, launch the latest version by clicking in the tile anywhere in
the white space of the tile that belongs to the latest version. The version 1.0.0 can be ran using this link
DRV884x-EVM-GUI.
Figure 4-1. TI GUI Composer Results for Launching or Downloading Local Installer
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5 Local Installation
Follow these instructions for downloading and installing the latest version of the EVM GUI application:
1. The EVM GUI application installer can be downloaded from the TI GUI Composer Gallery by clicking on the
download icon indicated by a red arrow in the Figure 4-1 above.
2. From the gallery, click the download icon in the latest version and select the installer for your operating
system (Windows, Linux or Mac).
3. Unzip the downloaded .zip file.
4. From the unzipped folder, run the GUI installer (.exe file with the current version.) If you have not installed
the GUI Composer Runtime, the installer will take care of this for you. The installer contents may look slightly
different for each OS, but should be self-explanatory.
5. You are now ready to run the GUI application on your local machine after completing the hardware setup in
the next section.
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6 Hardware Setup
1. Connect the USB cable to J11 of the EVM and a computer.
2. If using a stepper motor connect A-phase to J1 screw terminal connector and B-phase to J2 connector.
Repeat the connection using a second stepper motor on J1 and J2 if you wish to spin two stepper motors.
(Note: J1, J2 are Stepper 1 outputs and J3, J4 are Stepper 2 outputs).
3. On DRV8845EVM you can spin up to 4 brushed DC motors using connectors J1-J4.
Figure 6-1. DRV8845EVM motor connectors
4. Observing correct polarity connect the VM power supply to the large screw terminal block J8. In J8 the left
side is positive and right side is GND.
Figure 6-2. VM power connector
5. Verify that the EZFET LED D2, 3V3 LED D5 and are illuminated and that the MCU_STATUS LED D6 is
blinking at approximately 1Hz. If the STATUS LED is not blinking perform a firmware reset using the push
button S1 with jumper J6 in 1-2 RST position.
6. The MCU_STATUS LED D6 blinks now if the EVM hardware is functioning normally.
7. The EVM is ready to be used with the GUI application. In certain situations, such as while disconnecting and
reconnecting VM power before the power supply capacitors are fully discharged a proper firmware reset can
fail to happen. A proper reset is indicated by the STATUS LED D6 blinking at a rate of approximately 1 Hz. If
the Status LED is not blinking as expected, press the reset push button once with jumper J6 installed in the
RST position.
8. Do not unplug the USB cable while the VM power is active. If you do, switch off the VM power, wait until the
VM power is fully discharged and proceed to step 2.
9. The latest version of the GUI application is bundled with the latest version of the EVM firmware.
A firmware update is suggested before selecting and connecting to an EVM variant using the GUI application.
The firmware update procedure is described in the updating firmware section of this User's Guide.
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7 Launching the DRV884x-EVM-GUI Application
Whether using the desktop or web version of the GUI, the user experience and steps covered below is the same.
These steps assume the hardware setup steps in the previous section have already been completed.
1. Launch the GUI application using Chrome web browser or from your local desktop installation. Note you’ll
have to log-in to the TI Dev Gallery using your myTI log-in credentials prior to launching the app while
running from a web browser.
a. Hyperlink for running app in Chrome: Web GUI
2. Select the desired EVM type from the screen referenced in the Figure 7-1 below
Figure 7-1. DRV884x-EVM GUI Home Screen
3. After clicking the correct EVM type, the GUI application initiates communications with the EVM. Connection
confirmation is displayed as shown below:
Figure 7-2. Successful EVM Connection
4. If the GUI app connection with the EVM is repeatedly not successful, follow the below listed steps to debug
the issue.
a. Check if the serial communications parameters were properly configured. In the GUI, click on the
“Options” menu, and select “Serial Port”. Verify if the port selected matches the MSP Application UART1
enumerated in the Device Manager, Windows system Control Panel. The baud rate must be set to
9600 (recommended). If no MSP COMxx ports were enumerated and displayed in the Windows Device
Manager, ensure proper power sequencing was followed. If necessary do a power off and on cycle. If
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