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User's Guide
SLVUBR7 – October 2019
DRV8899-Q1 Evaluation Module User's Guide
This document is provided with the DRV8899-Q1 customer evaluation module (EVM) as a supplement to
the DRV8899-Q1 Automotive Stepper Motor Driver datasheet. This user's guide details the hardware
implementation of the EVM. Details on using the graphical user interface (GUI) software with this EVM can
be found in the DRV8899-Q1EVM GUI User's Guide.
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2
Contents
Board Overview ..............................................................................................................
Introduction ...................................................................................................................
2.1
Connectors ..........................................................................................................
2.2
Test Points ...........................................................................................................
2.3
Jumpers ..............................................................................................................
2.4
Motor Outputs .......................................................................................................
2.5
Reverse-Battery Protection ........................................................................................
2.6
EVM Operation ......................................................................................................
2.7
EVM documentation ................................................................................................
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4
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4
5
5
List of Figures
1
2
3
...................................................
Connections ..................................................................................................................
E3 EVM reverse-battery circuit.............................................................................................
Top view of typical board configuration (EVM provided may vary)
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3
5
List of Tables
1
Connections to DRV8899-Q1 Using External Microcontroller ......................................................... 4
Trademarks
MSP430 is a trademark of Texas Instruments.
Windows is a registered trademark of Microsoft Corporation.
All other trademarks are the property of their respective owners.
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Board Overview
1
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Board Overview
WARNING
DRV8899-Q1 EVM is rated for power supply voltages between 4.5
VDC and 45 VDC max. The components can support peak output
currents up to a maximum of 2.5 ADC. To minimize risk or personal
injury, fire and/or property damage, always maintain component
temperatures below the 130°C rating of the printed circuit board
material. TI requires that the continuous current into or out of
each xOUTx channel be limited to 910 mADC when operating for
extended periods of time with a maximum supply voltage of 13.5
VDC and minimum slew rate of 105 V/us. Under these driving
conditions, an ambient temperature of 25°C should never be
exceeded. Higher voltages and slower slew rates will increase
switching losses in the DRV8899-Q1, so output current may need
to be derated in these cases to keep board temperature below
130°C.
Figure 1 shows the top view of the printed circuit board (PCB).
Figure 1. Top view of typical board configuration (EVM provided may vary)
2
DRV8899-Q1 Evaluation Module User's Guide
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Introduction
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2
Introduction
The DRV8899-Q1 customer EVM is a platform to support prototyping and evaluation for the DRV8899-Q1,
a medium-voltage dual H-bridge driver for stepper driving applications. The DRV8899-Q1 drives a single
bipolar stepper with microstepping resolutions down to 1/256. It provides a variety of programmable decay
settings.
The EVM uses an MSP430™ microcontroller and a USB interface chip to manage communication from
the GUI software application installed on a PC computer with Windows®. The GUI sends serial commands
to the MSP430 to control the device signals, monitor faults, read and write SPI registers, and drive a
stepper motor by issuing the step commands at the desired rate.
This user's guide details the hardware configurability of the evaluation module.
2.1
Connectors
The DRV8899-Q1 EVM supplies the VM (motor voltage) power rail through a reverse-battery protection
circuit through terminal block (J1). A set of test clips in parallel with the terminal block provide connections
to monitor the input power rail.
The user must apply the VM voltage according to recommended parameters listed in the data sheet (4.5 V
to 45 V).
Figure 2. Connections
2.2
Test Points
A header connector with 0.100-inch pitch (J3) provides access to the DRV8899-Q1 signals. This can be
used for measurement or as a connector to control the DRV8899-Q1 from an external microcontroller for
prototype purposes. To disconnect the on-board MSP430 microcontroller, remove the resistors between
the MSP430 and the J3 header (R3, R4, R6, R7, R9, R11, R12, R14, R15, R16, and R17). Table 1
describes the connections available on the J3 header. Each header pin is labeled on the evaluation
module, and connects to a similarly named pin of the DRV8899-Q1.
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Introduction
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Table 1. Connections to DRV8899-Q1 Using External
Microcontroller
Header Label
Description
MCU 3.3 V
3.3 V rail for the on-board MSP430
and nFAULT LED
DVDD
Internal supply voltage regulator
for device logic. DVDD may not be
located on the header for some
prototype EVMs
nFAULT
Fault output
VREF
Voltage reference for full-scale
current
nSCS
Active-low chip select for SPI
communication
VSDO
Supply pin for SDO output.
Connect to 5-V or 3.3-V depending
on the desired logic level.
SDO
Serial data output. Data is shifted
out on the rising edge of the SCLK
pin.
SDI
Serial data input. Data is captured
on the falling edge of the SCLK pin
SCLK
Serial clock input. Serial data is
shifted out and captured on the
corresponding rising and falling
edge on this pin.
STEP
STEP, Step input
DIR
DIR, Direction input
DRVOFF
DRVOFF, Disable motor-driving
outputs
nSLEEP
nSLEEP, Sleep mode input
GND
Ground
A test point pad is available near the DRV8899-Q1 IC for probing DVDD.
2.3
Jumpers
The DRV8899-Q1 EVM has no jumpers.
2.4
Motor Outputs
Two motor connectors are provided (J6 and J7).
2.5
Reverse-Battery Protection
The DRV8899-Q1EVM board contains a reverse-battery protection circuit. If the voltage on GND is higher
than VBAT, then the circuit in Figure 3 should protect the DRV8899-Q1 and the MSP430 as long as the
USB in not plugged into a computer. If a USB cord is connected to the board while evaluating a reversebattery condition, the board, USB cable, or the USB port on the computer may be damaged.
4
DRV8899-Q1 Evaluation Module User's Guide
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Introduction
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Figure 3. E3 EVM reverse-battery circuit
2.6
EVM Operation
Use the following steps to operate the EVM:
Step 1. Install the drivers and GUI. For instructions see DRV8899-Q1EVM GUI User's Guide.
Step 2. Connect the wires of the stepper motor to the AOUT1, AOUT2, BOUT1, and BOUT2
terminals.
Step 3. Connect the VM power supply to VM or VBAT connections, but do not apply power at this
step.
Step 4. Connect the USB cable between the PC and the EVM. When the USB is connected to the
EVM, the status LED will begin to blink.
Step 5. Open the GUI. The GUI can be found in the start menu at Texas Instruments → GUI
Composer → DRV8899-Q1 → DRV8899-Q1 X.Y.Z, where X, Y, and Z are the revision
numbers (to be verified) or by typing "DRV8889" into the search bar of the start menu. If a
shortcut was created, double-click on the shortcut to open the GUI. The GUI can take up to
30 seconds to establish a connection. If connection is not established, select the COM port
under the Options menu. The baud rate is 9600.
Step 6. Apply the desired voltage (4.5 to 40 V) to the VM/VBAT and GND connections.
Step 7. For more instructions on how to control the DRV8899-Q1 EVM from the GUI, see the
DRV8899-Q1EVM GUI User's Guide.
2.7
EVM documentation
The EVM schematics, layout, and BOM are provided in the DRV8899-Q1EVM hardware files. The GUI,
USB drivers, and MSP430F2617 source code are provided in the DRV8899-Q1EVM firmware and GUI
software files.
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