Texas Instruments DRV3946-Q1EVM Manual de usuario

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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DRV3946-Q1EVM User's Guide 1

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

J11: IPROPI1 resistor for Driver A

J12: IPROPI2 resistor for Driver A

J15: IPROPI1 resistor for Driver B

J20: IPROPI2 resistor for Driver B

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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DRV3946-Q1EVM User's Guide 3

Table 2-1. DRV3946-Q1EVM Detailed Description of Components (continued)

Component Description

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

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

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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DRV3946-Q1EVM User's Guide 7

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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