Texas Instruments DRV3946-Q1EVM User manual

User's Guide
DRV3946-Q1EVM User's Guide
ABSTRACT
This document is the user's manual for the DRV3946-Q1 evaluation module (EVM) and the GUI to control the
EVM. The DRV3946-Q1 allows for easy control and evaluation of the DRV3946-Q1 which is a dual-channel
and fully integrated solenoid and contactor driver. This manual provides a detailed overview of the DRV3946-Q1
hardware features and instructions for using the included GUI to control the DRV3946-Q1EVM.
Table of Contents
1 Introduction.............................................................................................................................................................................2
2 Hardware Overview................................................................................................................................................................ 3
2.1 Connectors and Configuration Headers.............................................................................................................................4
2.2 Signal Test Points...............................................................................................................................................................5
2.3 LED Indicators....................................................................................................................................................................6
3 EVM GUI Control Application................................................................................................................................................ 8
3.1 MSP430 FET Drivers......................................................................................................................................................... 8
3.2 Cloud-based GUI............................................................................................................................................................... 8
3.3 Local Installation................................................................................................................................................................ 9
4 EVM GUI Operation...............................................................................................................................................................10
4.1 Hardware Setup............................................................................................................................................................... 10
4.2 Launching the DRV3946-Q1EVM GUI Application.......................................................................................................... 10
5 GUI Overview........................................................................................................................................................................ 13
5.1 Programming the EVM.....................................................................................................................................................15
5.2 Saving and Loading Register Configurations...................................................................................................................16
6 Contactor Driver SPI Modes................................................................................................................................................ 17
6.1 Standalone SPI................................................................................................................................................................ 17
6.2 Addressable SPI.............................................................................................................................................................. 17
7 Revision History................................................................................................................................................................... 19
Trademarks
Mac® is a registered trademark of Apple Inc.
Linux® is a registered trademark of Linus Torvalds.
Windows® is a registered trademark of Microsoft Corporation.
All trademarks are the property of their respective owners.
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1 Introduction
WARNING
The evaluation module (EVM) has a fuse that is rated for 20 A. To prevent the fuse from activating,
verify that the maximum current draw of the battery voltage supply is always less than 20 A.
The DRV3946-Q1EVM includes two DRV3946-Q1 ICs, each able to drive two contactors in a low-side
configuration. The DRV3946-Q1 is able to drive up to 9 A per channel for a total of 18 A if both output channels
are driving at maximum capacity. The EVM comes with a 20-A fuse which disconnects the power supply from the
rest of the board in the case of large current increase. The fuse protects all of the components on the board. The
DRV3946-Q1 has many multiple-protection features such as overcurrent protection, overtemperature shutdown,
undervoltage, and more that protect the device and contactor but do not provide system-level protection.
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2 Hardware Overview
The following sections provide information on the main components of the EVM. A detailed explanation of each
of the main components, such as connectors, configuration headers, and signal-test points, is given. Other
information, such as voltage and current ratings, is described so that the user is aware of the limitation of the
hardware to prevent potential damage to the board and its components. Figure 2-1 shows the main components
of the DRV3946-Q1EVM. Table 2-1 gives a detailed description of each of the marked components. Both Figure
2-1 and Table 2-1 are referenced in the following sections.
Figure 2-1. DRV3946-Q1EVM Hardware Components
Table 2-1. DRV3946-Q1EVM Detailed Description of Components
Component Description
AJ16: NAD_nFAULT resitor for Driver A
J17: NAD_nFAULT resitor for Driver B
B
J11: IPROPI1 resistor for Driver A
J12: IPROPI2 resistor for Driver A
J15: IPROPI1 resistor for Driver B
J20: IPROPI2 resistor for Driver B
C
J1: S1 button function selection header; default position set to RST.
PUSH function is not supported by firmware. Firmware can be
modified to perform any desired task when the button is pressed
and the shunt is placed in PUSH position.
S1: MCU Reset/Push function button. Only the MCU Reset function
is supported. Press the button to reset the MCU when J1 is in RST
position.
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Table 2-1. DRV3946-Q1EVM Detailed Description of Components (continued)
Component Description
D
J7: Header for serial communication signals (RX, TX) and
TDIO/TCK for programming main MCU (U3). Shunts are required
for communication between the main MCU (U3) and the ezFET-LITE
debugger.
J5: EZFET-LITE flashing connector. Leave the header disconnected.
J6: USB connector
E STATUS LEDs. Refer to Section 2.3
F Main signal header. Refer to Section 2.2
G
U1: DRV3946-Q1 Driver A
J2: Driver A OUT1 and PVDD connector
J3: Driver A OUT2 and PVDD connector
H Reverse battery protection, fuse, and EMI filter circuit
I Main power supply (VBAT) connector
J
U8: DRV3946-Q1 Driver B
J8: Driver B OUT1 and PVDD connector
J21: Driver BOUT2 and PVDD connector
2.1 Connectors and Configuration Headers
The main power connector J14 (I) is where the VBAT supply is connected. The maximum current the connector
can withstand before damage or malfunction occurs is 20 A. To prevent potential damage to the board, ensure
that the supply current does not exceed 20 A. If the current does exceed 20 A, the included 20-A fuse should
protect the board. Protection should not soley rely on the fuse. TI recommends limiting the supply current to
below 20 A to further protect the board.
The output connectors J2, J3, J21, and J8 (L) are the same as the J14 (I) main power connector. The DRV3946-
Q1 is able to drive up to 9 A per channel, the maximum current expected for each connector is 9 A.
The IPROPIx_y headers (A) select the IPROPI resistor for each driver output. See the data sheet for the full list
of suitable IPROPI resistor values. To minimize the board area, only select resistor values are included in the
header. If the user desires to use a resistor value that is not listed in the header, the resistor can be soldered to
the DNP footprint. Table 2-2 lists the available IPROPI resistor values in the EVM.
Table 2-2. IPROPI Resistor Selector Headers Values
Header Pins Resistor Value to GND
1-2 4.7 kΩ
3-4 5.6 kΩ
5-6 6.8 kΩ
7-8 8.25 kΩ
9-10 10 kΩ
11-12 12 kΩ
13-14 15 kΩ
15-16 18 kΩ
17-18 20 kΩ
19-20 DNP
The NAD_FAULT_x headers select the NAD_FAULT resistor values. By default, 8.7 kΩ is chosen for driver A
and 22 kΩ is chosen for driver B. See the data sheet for more information about the NAD_FAULT resistors and
their functions. Table 2-3 lists the available NAD_FAULT resistor values for each header.
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Table 2-3. NAD_FAULT Resistor Selector Headers Values
Header Pins Resistor value to GND
1-2 DNP. Placeholder resistor. Do not place shunt.
3-4 5.6 kΩ
5-6 12 kΩ
7-8 27 kΩ
9-10 56 kΩ
2.2 Signal Test Points
Table 2-4 provides descriptions for each MCU signal in header J4. There are two rows of resistors on each side
of the header that are labeled "A" and "B" in Figure 2-2. Removing resistors in row "A" disconnects the signal
from the MCU and allows an external controller to control the drivers. Conversely, removing the resistors on
row "B" disconnects the signals from the driver. Removing the resistors allows for the on-board MCU and GUI
application to control an external DRV3946-Q1 driver.
Figure 2-2. J4 MCU Signal Header
Table 2-4. MCU Signal Header
Signal Description
GND Common board GND
3.3 V 3.3 V output from on-board LDO
IPROPI1_A OUT1 IPROPI output for Diver A
IPROPI2_A OUT2 IPROPI output for Diver A
ENABLE1_A OUT1 enable for Driver A
(EN/EN1 in production IC)
ENABLE2_A OUT2 enable for Driver A (DIS/EN2 in production IC)
SW_EN2_CTL High-side switch 2 control signal
SW_EN1_CTL High-side switch 1 control signal
NAD_nFAULT_A FAULT signal for Driver A
SDO SDO signal
SDI SDI signal
SCLK SCLK signal
nSCS_A nSCS signal for Driver A
nSCS_B nSCS signal for Driver B
IPROPI1_B OUT1 IPROPI output for Diver B
IPROPI2_B OUT2 IPROPI output for Diver B
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Table 2-4. MCU Signal Header (continued)
Signal Description
ENABLE1_B OUT1 enable for Driver B (EN/EN1 in production IC)
ENABLE2_B OUT2 enable for Driver B (DIS/EN2 in production IC)
NAD_nFAULT_B FAULT signal for Driver B
2.3 LED Indicators
There are LEDs on the EVM that are used for various visual indicators. Figure 2-3 highlights all of the LEDs in
the DRV3946-Q1EVM and Table 2-5 provides a brief description of each LED.
Figure 2-3. EVM Indicator LEDs
Table 2-5. Description of LEDs
LED Description
D3 PVDD supply indicator
D5 EZFET-LITE flashing indicator. Will flash when the EVM is being
programmed.
D6 When EVM USB connects successfully to the computer
D7 Blinks ON/OFF at a rate of approximately 1 second when the MCU is
active and indicates that the EVM is programmed
D1 Will blink rapidly ON/OFF when the the EVM has successfully
connected to the GUI
D11 Driver B fault indicator. Will turn ON when a fault is detected.
D9 Driver A fault indicator. Will turn ON when a fault is detected.
D2 Driver A fault indicator. Will turn ON when a fault is detected.
D13 Turn ON when Driver B is active
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Table 2-5. Description of LEDs (continued)
LED Description
D12 Turn ON when Driver A is active
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3 EVM GUI Control Application
The GUI application is written with Texas Instruments’ GUI Composer, and can be run directly from a Chrome-
based web browser, or installed onto your computer. Because GUI Composer apps are written with a NodeJS
back end, the GUI application is cross-platform compatible by design. This document only covers installation on
a PC for sake of brevity, but Mac® and Linux® users can find installers in the GUI Composer Gallery.
3.1 MSP430 FET Drivers
The MSP430 FET Drivers are required for the operating system to properly enumerate the JTAG and UART
ports created by the EZFET_LITE. The latest drivers can be found here: MSP430 FET Drivers
Download the driver package corresponding to your operating system, extract the archive, and run the installer.
In Windows®, two new ports must be enumerated when the EVM is connected Figure 3-1:
Figure 3-1. MSP430 EZFET_LITE Enumerated USB Ports
Successful installation also shows Texas Instruments as the driver publisher (Figure 3-2):
Figure 3-2. MSP Application UART Driver Properties
3.2 Cloud-based GUI
To launch the GUI application from your Chrome-based browser:
1. Navigate to the DRV3946-Q1EVM-GUI.
2. When presented with the list of available GUIs, launch the latest version by clicking on the title. Only click
areas that are not related to the icons for downloading the installer or GUI Composer. Refer to Figure 3-3.
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Figure 3-3. TI GUI Composer Gallery Results for Launching or Downloading Local Installer
The setup and operation of the GUI hardware is the same as the desktop version. The setup is consolidated in
the following EVM GUI Operation section.
3.3 Local Installation
Follow these instructions for downloading and installing the latest version of the EVM GUI application:
1. The EVM GUI application installer can also be downloaded from the TI GUI Composer Gallery, DRV3946-
Q1EVM-GUI.
2. From the gallery, click the icon for the latest version and select the installer for your operating system
(Windows, Linux or Mac). Refer back to the previous section for a visual depiction of the Gallery page.
3. Decompress the .zip file.
4. From the decompressed archive, run the installer DRV3946-Q1EVM-GUI-x.y.z.setup-win.exe, refer to the
GUI Application Archive Contents. The installer will install the GUI Composer Runtime, if it is has not been
previously installed. The installer contents is self-explanitory and will look slightly different for each OS.
Figure 3-4. GUI Application Archive Contents
5. After completing the hardware setup in the next section, the GUI application is prepared to run on your local
machine.
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4 EVM GUI Operation
4.1 Hardware Setup
Follow these steps to setup the EVM before launching the GUI:
1. It is advised to make any jumper configuration changes before powering the EVM. Before powering up the
board, selected the IPROPIx_A, IPROPIx_B, and NAD_nFAULT_x headers.
2. Connect the micro-USB cable to J6 (Figure 2-1). For proper GUI application operation, it is important to
connect the EVM USB cable to a computer before applying +VBAT power to the EVM. For standalone EVM
testing a USB connection is not necessary.
3. With the +VBAT external supply outputs disabled, connect +BAT supply to the screw terminals on the EVM
(J14), while observing polarity (Figure 2-1).
4. Energize the +VBAT supply. PVDD LED D3 and 3.3V_MCU LED D7 will illuminate. If VM LED does not
illuminate, verify polarity and confirm that fuses are installed and maintain continuity.
5. After applying the +VBAT supply, LED D6 will illuminate to indicate that there is a successful USB connection
with the computer. If the LED is not on, disconnect the USB cable from the computer, turn off the power
supply, reconnect the USB to the computer, and turn on the supply.
6. The EVM is ready for use with the GUI application (Section 4.2). In certain situations, a proper firmware
restart may not happen. One example of an instace where a proper firmware restart does not occur is when
disconnecting and reconnecting VM power before the power supply capacitors are fully discharged. If the
Status LED (D1) is not blinking as expected, install the jumper J1 in the RST position and press the reset
push button once. Do not unplug the USB cable while the VM power is active. If the USB cable is unplugged
while the VM power is active, switch off the VM power, wait until it is fully discharged and proceed to step 2.
7. The latest version of the GUI application is bundled with the latest version of the EVM firmware. When using
the GUI application, it is recommended to do a firmware update before selecting and connecting to an EVM
variant. The firmware update procedure is described in the Section 5.1 section of this user's guide.
4.2 Launching the DRV3946-Q1EVM GUI Application
The user experience and steps described below are the same regardless of using the desktop or web version of
the GUI. In order to complete the next steps, it is assumed that the hardware setup steps in the previous section
have already been completed.
1. Launch the GUI application.
2. From the screen referenced in Figure 4-1, click on the icon to the right labeled "DRV3946-Q1EVM."
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Figure 4-1. DRV3946-Q1EVM GUI Main Start-up Page
3. After clicking the icon, the GUI application initiates communications with the EVM. Connection confirmation
is displayed as shown below in Figure 4-2. The EVM should now be connected. The GUI_STATUS LED
(D11) blinks to confirm that there is a successfull GUI connection. Do not proceed to use the GUI app if the
D11 is not blinking.
Note
If the EVM GUI does not register a successful connection after multiple attempts, update the
firmware and use the GUI application to select a connecting EVM variant.
Figure 4-2. Successful EVM Connection
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4. Set up the EVM for device evaluation. These are the pages for set up:
• Register Map page for reading and writeing access of the register bit fields
• Contactor control page with configuration and diagnostic options
• GUI Home page
Figure 4-3. DRV3946-Q1EVM GUI Contactor Control Page
Figure 4-4. DRV3946-Q1EVM GUI Register Map Page
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5 GUI Overview
Figure 5-1 shows the motor control page of the GUI application. The main sections of the control page are
labeled A through S. Table 5-1 describes each labeled section. Before trying to use the GUI, read the data sheet
to learn more about the register map and the different configuration parameters for this driver.
Note
The "FAULT DRIVER A" and "FAULT DRIVER B" fault indicators and the corresponding fault LEDs in
the EVM are red during the initial power up and GUI connection. The red fault LEDs are due to the
DRV3946-Q1 detecting an open load warning (OLD) which is enabled by default. To clear the fault,
write 4'b0000 to nFAULT_CONFIG bit field in the register CONFIG_A5 (address 0x15). Read the data
sheet to learn about fault reporting the DRV3946-Q1.
Figure 5-1. GUI Contactor Control Page Overview
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Figure 5-2. GUI Contactor Control Page Overview
Table 5-1. DRV3946-Q1EVM GUI Description
Section Description
A Main GUI start-up page.
B
Register map page. Device registers can be read/written to configure
device. All of the configurations can be done in the register map if
desired.
C
Contactor/solenoid control page. Most of the basic configurations
can be done in this page. Use the register map for more advanced
configurations.
D Home page.
E
Select between individual driver control or simultaneous control of
both drivers with NAD (Non-addressable) SPI. Jumper setting must
be modified in the hardware to support Addressable SPI. Refer to
Section 6.
F
Select between controlling driver A or B. In Standalone SPI, only the
selected driver is active. In Addressable SPI, both drivers are active
and only the selected driver can be configured. Refer to Section 6.
GEnable 1 and Enable 2 (EN/EN1 and DIS/EN2 for production IC)
control widgets.
H
NAD resistor settings. Click the NAD Setting button to switch
between Driver A and Driver B and select the NAD resistor from the
nFAULT/NAD resistor drop-down menu. The resistor for each Driver
must match the selected resistor in J16 and J17 (Figure 2-1).
I PWM settings.
J
Control configurations. The RIPROPI 1 and RIPROPI 2 must match
the selected IPROPI resistor in J11 and J12 or J15 and J20
depending on the driver selected (Figure 2-1).
KDriver A peak current, hold current, and peak time settings.
LDriver B peak current, hold current, and peak time settings.
M Connected device name and Firmware version.
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Table 5-1. DRV3946-Q1EVM GUI Description (continued)
Section Description
N
Fault summary table. FAULT DRIVER A and FAULT DRIVER B
mirror the NAD/nFAULT pins of each driver respectively. When NAD/
nFAULT is LOW, indicating a fault, the corresponding status indicator
turns RED. The remaining fault indicators are for common warnings.
Click the "CLEAR" button to clear a fault.
Refer to the register map to view all the faults and warnings in the
STATUS registers.
O
Device Selector widget. Same as widget F. Register values shown in
the register map correspond to the selected driver. Please note that
if the drivers are reset from a power cycle, the register values returns
to their default values.
P Register value column. Write desired value to write to the registers.
Q
Frequency at which GUI reads all of the registers and display
updated values in the register map. Default value is 1 second.
If Auto Read function is not desired, the function can be set to
"NONE". Doing so activates the "READ REGISTER" and "READ ALL
REGISTER" buttons. "READ REGISTER" will only read the selected
register. "READ ALL REGISTERS" will read all registers.
R
"Immediate Write" writes to the register as soon as the value is
entered. "Deferred Write" only writes the to register after value has
been entered and the "WRITE REGSITER" button is clicked.
S Bit field view of selected register.
5.1 Programming the EVM
Complete a firmware update if the EVM is not connecting to the GUI app after multiple attempts. A pop-up
message appears when the hardware firmware is out of date. The following steps describe how to update the
firmware of the EVM using the GUI:
1. Connect the EVM to the GUI following the instructions in Section 4.1.
2. Open the GUI and click on the "DRV3946-Q1EVM" icon on the right side of the main start-up page. There is
a chance for failure when the GUI attempts to connect to the EVM. Wait until the GUI says the EVM is either
successfully or unsuccessfully connected.
3. Click on File -> Program Device to program the EVM (see Figure 5-3). A small pop-up small window shows
the firmware flashing progress. A message is displayed if errors occur. If there are no errors, the display will
indicate that the flashing was successful.
4. The GUI will attemp to connect to the EVM. After successfully connecting, the page resembles Figure 4-2. If
connection is not successful, follow instructions in Section 4.1 and Section 4.2.
Figure 5-3. GUI Program Device Tab
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5.2 Saving and Loading Register Configurations
The DRV3946-Q1EVM GUI has a built-in feature to save the current register configurations as a .json file which
loads to the GUI. The following steps outline the procedure for saving and loading register configurations.
1. After writing the desired register values, click on the "File" tab and click "Save Registers."A save file pop-up
window will appear to name and save the .json file.
2. To recall the register configurations, click on the "File" tab and then the click "Load Registers." Select the
saved .json file to load the register values.
Figure 5-4. Save and Load Registers Menu
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6 Contactor Driver SPI Modes
The EVM and GUI support standalone and addressable SPI which are selectable from the driver configuration
widget. Refer to the Figure 5-1 for the widget location. In the standalone SPI, only the selected driver is active
and each device has a dedicated nSCS signal. In the addressable SPI, the SPI bus is shared between both of
the drivers which allows for both drivers to have simultaenous SPI communication.
6.1 Standalone SPI
Standalone SPI is the default serial communication mode. The Standalone SPI mode is selected when only one
driver is controlled while the other driver is inactive. In the standalone SPI mode, each driver has its own nSCS
signal and only the nSCS of selected driver functions. Therefore, SPI communication is only possible with a
selected driver. The Figure 6-1 shows the SPI connections for a standalone SPI.
Figure 6-1. Standalone SPI Diagram
6.2 Addressable SPI
Addressable SPI allows for SPI communication with both drivers to occur simultaneously. In this mode, one
nSCS signal is connected to both drivers. Figure 6-2 shows the SPI connections for an addressable SPI. The
register map displays the register values of the selected driver. To write to a specific driver, select the specific
driver in the GUI.
Figure 6-2. Addressable SPI Diagram
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For both drivers to have successful communication, do the following:
• Verify that the NAD/nFAULT resistor of each driver is different. The NAD resistors for each driver are selected
in headers J16 and J17 (Figure 2-1). The resistor value must match the resistor selected in the GUI (Figure
2-1 or communication fails.
Note
While powering-up the DRV3946-Q1, the NAD/nFAULT resistors are latched. Before powering-up the
board, verify that the desired resistors for each driver are selected in the EVM.
• The nSCS_A and nSCS_B signals must be shorted in the EVM. Place a shunt across the nSCS_A and
nSCS_B test points in J4 as shown in Figure 6-3.
Figure 6-3. Shunt Placement Location for Addressable SPI
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7 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
DATE REVISION NOTES
October 2021 * Initial Release
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