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Texas Instruments DRV8847EVM User guides
User's Guide
SLVUBF8 – June 2018
DRV8847x EVM User's Guide
The DRV8847x EVM user's guide is provided with the DRV8847 and DRV8847S customer evaluation
modules (EVM) as a supplement to the DRV8847 Dual H-Bridge Motor Driver data sheet. This document
describes the hardware implementation, operation, and configuration options of the EVM.
CAUTION
Hot surface. Contact may cause burns. Do not Touch.
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2
Contents
Overview ......................................................................................................................
Hardware Overview..........................................................................................................
2.1
Features ..............................................................................................................
2.2
Board Overview .....................................................................................................
2.3
Test Points ...........................................................................................................
2.4
Jumpers ..............................................................................................................
2.5
Motor Outputs .......................................................................................................
2.6
Operation of the EVM ..............................................................................................
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4
5
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List of Figures
1
DRV8847EVM Top 3D Overview .......................................................................................... 2
2
DRV8847EVM Board Overview............................................................................................ 3
3
Test Points and Jumper Configuration .................................................................................... 4
List of Tables
1
J4 Header Connections ..................................................................................................... 4
Trademarks
MSP430 is a trademark of Texas Instruments.
All other trademarks are the property of their respective owners.
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1
Overview
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Overview
The DRV8847 evaluation module (EVM) is an application board design to allow easy evaluation of the
DRV8847 device. The DRV8847 device is an integrated low voltage dual H-bridge driver and highlyconfigurable power stage for industrial brushed DC, stepper motor, and solenoid applications. This device
has been optimized to control one or two brushed DC motors, a stepper motor, or solenoid loads. The
DRV8847 device can also be configured to drive a single brushed DC motor using both output stages in
parallel mode to increase the driving current. Use the DRV8847SEVM to evaluate the I2C device variant,
DRV8847S.
The EVM has an MSP430™ microcontroller and an USB interface chip to communicate with the
application GUI provided with the EVM. The maximum operating voltage for this board is 18 V with a
maximum current of 2 A (if set to parallel mode).
The microcontroller firmware outputs the control signals and PWM signals to move the motor. The
firmware also monitors the nFAULT signal to alert the GUI if a fault has occurred.
Figure 1 shows the top 3D view of the printed circuit board of the DRV8847EVM.
Figure 1. DRV8847EVM Top 3D Overview
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Hardware Overview
2.1
Features
The DRV8847EVM and DRV8747SEVM have these features:
• An operating supply voltage range from 2.7 V to 18 V
• Hardware set up to drive steppers, brushed motors, or up to 4 solenoid loads
• A board rated to drive up to 2-A parallel load current.
2
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Hardware Overview
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2.2
Board Overview
The DRV8847EVM and DRV8847SEVM let the user access the VM (motor voltage) power rail through a
terminal block (J5). A set of test clips in parallel with the terminal block lets the user monitor the input
power rail.
The VM voltage must be applied according to the recommended parameters in the DRV8847 Dual HBridge Motor Driver data sheet.
Figure 2 shows the primary blocks of the hardware on the DRV8847EVM or DRV8847SEVM.
NOTE: The VDD voltage for the microcontroller comes from the microUSB connector.
Figure 2. DRV8847EVM Board Overview
The primary components of the EVM board are:
• The DRV8847 device (U4) which is a 2.8-V to 18-V dual H-bridge motor driver
• The MSP430G2553 MCU (U1) which is an ultra-low power mixed signal microcontroller
• The power connection (J5)
• The motor Connections (J9, J10)
• The test point (J4)
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Hardware Overview
2.3
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Test Points
The DRV8847EVM has multiple test points for easy evaluation of the device. These test points are
connected in series to the microcontroller through 0-Ω resistors and can be depopulated easily in the case
an external microcontroller is used. Table 1 shows the J4 header connections as shown in Figure 3.
Table 1. J4 Header Connections
Header Label
Description
—
Ground
R8
nSLEEP
R9
IN1 input
R10
IN2 input
R11
SDA/MODE
R12
SCL/TRQ
R13
IN3 input
R14
IN4 input
R15
nFault
R16
3P3V
Figure 3. Test Points and Jumper Configuration
4
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Hardware Overview
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2.4
Jumpers
The DRV8847EVM and DRV8847SEVM boards have three jumpers, J6, J7 and J8. The J6 and J7
jumpers set the output current. The parallel resistors provide twice the current for each H-bridge when the
shunt connectors are installed (see Figure 3).
The J8 jumper is used when the device is set in parallel mode. In this mode, the DRV8847EVM or
DRV8847SEVM can drive a brushed motor up to 2 A of current by installing a shunt across the J8 jumper.
The short test points, OUT1-OUT3 and OUT2-OUT4, must be paired together respectively for parallel
mode.
2.5
Motor Outputs
The J3 and J4 connectors are available as shown in Figure 1 to connect the desired output load. The
outputs change depending on the type of load to be driven (either stepper, BDCs, or solenoids).
2.6
Operation of the EVM
Do these steps to operate the EVM:
Step 1. Download and install the drivers and GUI from the tool folder for the DRV8847EVM or
DRV8847SEVM. Refer to the DRV8847EVM and DRV8847SEVM Software User's Guide for
detailed steps.
Step 2. Connect the wires of the load to the AOUT1, AOUT2, BOUT1, and BOUT2 terminals as
required.
Step 3. Connect the VM power supply but do not apply power at this step.
Step 4. Connect the USB cable between the PC and the EVM.
Step 5. Apply 12 V to the VM and GND connections.
Step 6. Open the GUI by from the desktop or from the start menu to start the GUI.
Step 7. Select the device variant to be used in the launch page.
Step 8. Refer DRV8847EVM and DRV8847SEVM Software User's Guide for detailed GUI
configuration of the modes according to the driving load.
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