Texas Instruments DRV8328 EVM Series User manual

User’s Guide
DRV8328xEVM User's Guide
ABSTRACT
This document is provided with the DRV8328 customer evaluation module (EVM) as a supplement to the
DRV8328x data sheet (DRV8328 4.5-V to 60-V Three-Phase Smart Gate Driver). This User's Guide details the
implementation of the EVM and shows how to set up and power the board.
Note
The DRV8328AEVM comes automatically populated with and configured for the DRV8328A. It is also
compatible for the DRV8328B, DRV8328C, and DRV8328D variants (see Section 3.4.1 and Section
3.4.2), but the user will need to modify the board to make it compatible for each variant (see Table 3-3
and Table 3-4).
Table of Contents
1 Introduction.............................................................................................................................................................................2
2 Quick Start Guide....................................................................................................................................................................4
3 Hardware and Software Overview.........................................................................................................................................5
3.1 Hardware Connections Overview – DRV8328AEVM + LAUNCHXL-F280049C................................................................5
3.2 Connection Details............................................................................................................................................................. 5
3.3 LED Lights..........................................................................................................................................................................7
3.4 DRV8328AEVM Configurability and Switch Functions.......................................................................................................9
3.5 Interfacing DRV8328AEVM and LAUNCHXL-F280049C LaunchPad............................................................................. 14
4 Hardware Setup.................................................................................................................................................................... 16
5 Firmware and GUI Application.............................................................................................................................................17
5.1 Connecting to the DRV8328AEVM-GUI...........................................................................................................................17
5.2 DRV8328AEVM-GUI Quick Start Guide...........................................................................................................................18
5.3 Using the DRV8328AEVM-GUI........................................................................................................................................19
6 Schematics............................................................................................................................................................................20
6.1 DRV8328A/B/C/D.............................................................................................................................................................20
6.2 DRV8328C/D variant select............................................................................................................................................. 21
6.3 Status LEDs..................................................................................................................................................................... 21
6.4 LaunchPad Connectors and Connections........................................................................................................................22
6.5 External 3.3V LDO........................................................................................................................................................... 23
6.6 Power Stage and MOSFETs............................................................................................................................................ 23
6.7 Main Supply Input............................................................................................................................................................ 24
6.8 Hall Sensor and Hall Power Selection............................................................................................................................. 25
6.9 Connectors, Selectors, and Analog Control Interface...................................................................................................... 26
6.10 Voltage Sense and Protection........................................................................................................................................27
7 Revision History................................................................................................................................................................... 28
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1 Introduction
The DRV8328 is a 4.5-V to 60-V triple half-bridge gate driver IC for motor drive applications. It provides a
bootstrap architecture to drive 3 high-side and 3 low-side N-channel MOSFETs with up to 1-A peak source and
2-A peak sink current. It can also support up to 100% PWM duty cycle inputs with an integrated trickle charge
pump. All variants are in compact QFN packages with hardware configurations and provide ultra-low sleep mode
current. Additionally, variants offer a variety of optional features including a dead time pin, overcurrent level pin,
driver shutoff pin, and integrated LDO capable of driving 3.3 V and 80 mA. A summary of the variants below can
be seen in Table 1-1.
Table 1-1. DRV8328 device variant names and descriptions (default of EVM in bold)
Device Name LDO Output DT pin and VDSLVL pin PWM Mode
DRV8328A N/A Available 6x PWM
DRV8328B N/A Available 3x PWM
DRV8328C 3.3 V N/A 6x PWM
DRV8328D 3.3 V N/A 3x PWM
The DRV8328AEVM can be interfaced with the TMS320F280049C microcontroller on the LAUNCHXL-
F280049C LaunchPad in correspondence with the reference software to provide the algorithm to the DRV8328
to control the BLDC motor.
This document serves as a startup guide to supplement the DRV8328AEVM + LAUNCHXL-F280049C BLDC
motor control demo kit. It also is intended to help engineers design, implement, and validate reference hardware
and software for the LaunchPad MCU and DRV8328. For step by step details on connecting the LAUNCHXL-
F280049C + DRV8328AEVM, refer to Section 4.
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Figure 1-1. DRV8328AEVM PCB Layout
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2 Quick Start Guide
The DRV8328AEVM requires a power supply with a recommended operating range from 4.5-V to 60-V. To setup
and power the EVM, follow the sequence below:
1. Connect the power supply ground to the GND of the 2-pin power connector J9 and the power supply positive
terminal to the PVDD pin of J9. Ensure jumpers JP1, JP2, and JP3 of the LAUNCHXL-F280049C are not
populated (DNP) to ensure that the LaunchPad is powered by the DRV8328AEVM and the motor supply is
isolated from the USB.
2. Connect the motor phases to OUTA, OUTB, and OUTC in the correct order to connector J12. For sensored
applications, connect the Hall sensors to the appropriate locations on the 5-pin connector J10 as shown in
Figure 3-2. Select AVDD or EXT on jumper J11 to choose the Hall power source voltage.
3. Mate the DRV8328AEVM onto the top half of the LAUNCHXL-F280049C (LaunchPad Headers J1/J3 and
J2/J4) as shown in Figure 3-3. The motor and power connectors should face the same direction as the
Micro-USB connector on the LaunchPad.
4. Remove R26 if toggling nSLEEP from switch on board. Place nSLEEP switch in WAKE position.
5. Power on the DRV8328AEVM.
6. Connect a Micro-USB cable from the computer into the Micro USB connector on the top of the LAUNCHXL-
F280049C as shown in Figure 3-3.
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3 Hardware and Software Overview
3.1 Hardware Connections Overview – DRV8328AEVM + LAUNCHXL-F280049C
Figure 3-1 shows the major hardware blocks of the DRV8328AEVM. The DRV8328AEVM is designed for an
input supply from 4.5-V to 60-V.
N- type Power
MOSFETs
Power supply
connections
Motor output
connections
VDSLVL
pot.
Hall connections Dead time
potentiometer
DRVOFF
switch
nSLEEP
switch
Optional LEDs
External CSA
and Shunt
Resistor
DRV8328A/B/C/D
A/B or C/D
variant
select
Speed pot
Figure 3-1. Major hardware blocks of the DRV8328AEVM
3.2 Connection Details
Figure 3-2 shows the power supply and motor connections made to the DRV8328AEVM in order to spin a
3-phase sensored or sensorless Brushless-DC motor.
A 4.5-V to 60-V power supply or battery is connected to the PVDD and GND terminals. The three phases of the
BLDC motor connect directly to the OUTA, OUTB, and OUTC terminals of the screw terminal J12 provided on
the DRV8328AEVM.
For sensored applications, to connect the Hall sensor outputs to the Hall connectors on the DRV8328AEVM,
push down on the respective terminals to open the sockets and insert the Hall sensor wires into connector J10.
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GND
PVDD
Motor Output A
Motor Output B
Motor Output C
Figure 3-2. Connections from motor to DRV8328AEVM
Figure 3-3 and Figure 3-4 shows where the Micro-USB cable is plugged in to the LAUNCHXL-F280049C to
provide communication between the LaunchPad firmware and GUI as well as the correct installment of the
DRV8328AEVM to the J1/J3 and J2/J4 headers of the LaunchPad.
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Figure 3-3. DRV8328AEVM on headers J1/J3 and J2/J4 of LaunchPad
Figure 3-4. Micro-USB plugged into LaunchPad
3.3 LED Lights
There are LED indicators on both the LAUNCHXL-F280049C and DRV8328AEVM when power is provided and
the micro USB cable is plugged in to the LaunchPad.
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The DRV8328AEVM has 4 status LEDs on the board. By default, the PVDD and AVDD LEDs will light up when
the board is powered on. The fault LED will light up when the driver reports a fault, and the MCU LED (tied to
GPIO59) can be used for debugging and validation. Table 3-1 shows the LED descriptions, with the LEDs that
are on during power up indicated in bold. Figure 3-5 shows the LED locations on the EVM. These LEDs all have
removable jumpers to reduce power consumed by the EVM.
Table 3-1. Description of DRV8328AEVM LEDs (on during power up in bold)
Designator Jumper Name Color Description
D1 J1 3V3 Green AVDD is outputting 3.3 V
D2 J2 nFAULT Red Lights up when fault
condition has occurred on
DRV8328
D3 J3 PVDD Green Power is supplied to the
board
D4 J4 MCU_LED Orange MCU debugging
MCU
LED
nFAULT
LED
3.3V LDO (A/B) or
AVDD (C/D) LED
PVDD
LED
Figure 3-5. DRV8328AEVM LEDs
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3.4 DRV8328AEVM Configurability and Switch Functions
The DRV8328AEVM includes a variety of user-selectable jumpers and unpopulated components on the PCB to
choose user settings and evaluate the DRV8328A, DRV8328B, DRV8328C, or DRV8328D device. A summary
of those selectable settings is listed in Table 3-2 (defaults in bold) and can be seen on the board in Figure 3-6.
Section 3.4.1 and Section 3.4.2 describes the changes that need to be made to the board in order to use the
variants of the DRV8328 device.
Table 3-2. Description of user selectable settings on DRV8328AEVM
Id. Setting Name Description Position Function
A nSLEEP switch Places DRV8328 in sleep
mode
S1 = Right Sleep mode
S1 = Left Operating mode
B External CSA output filter RC output filter to
suppress high frequency
transients of CSA output
from current shunt.
R59 = 56 ohms, C31 =
2200 pF
Fc ~1 MHz
C Power stage MOSFETs
and passive components
Optional passive
components for tuning
power stage, for example
series gate resistors,
RC snubbers, PVDD-GND
capacitors, PVDD-LSS
capacitors
R43, R44, R45, R49, R50,
R51 = 10 ohm
Series gate resistors
(GHA, GHB, GHC, GLA,
GLB, GLC)
R40/C10, R41/C11, R42/
C12, R55/C24, R56/C22,
R57/C23
RC snubbers
(HS FET A, HS FET B, HS
FET C, LS FET A, LS FET
B, LS FET C)
C14, C16, C18 = 2.2 uF PVDD-VDRAIN bypass
capacitor
C19, C20, C21 = 0.01 uF PVDD-LSS bypass
capacitors
D LDO jumpers Jumpers to enable the
external LDO and disable
the LDO output. Remove
jumpers if DRV8328C/D is
used.
J8 = Populated LDO is enabled
J8 = DNP LDO is disabled
J16 = Populated LDO outputs 3.3 V
J16 = DNP LDO output removed
E Dead time potentiometer,
jumper, & resistor
Jumper to enable
dead time control
from potentiometer and
potentiometer used to set
the resistance for DT pin
(DRV8328A/B only).
J14 = Populated DT from pot is enabled
J14 = DNP DT from pot is disabled
R99 (CW = more DT,
CCW = less DT)
Sets dead time of gate
outputs
R91 Fixed resistor for DT pin
F HALL_PWR select Use J6 to supply Hall
power from 3.3 V or 5 V.
J11 = AVDD Supplies AVDD to Hall
power
J11 = EXT Supply external hall power
from HALL_PWR_EXT
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Table 3-2. Description of user selectable settings on DRV8328AEVM (continued)
Id. Setting Name Description Position Function
G VDSLVL potentiometer,
select and disable jumpers
Potentiometer to set
VDSLVL between 0.1-2.5
V, VDSLVL_SEL to select
voltage source, disable
jumper to disable VDSLVL
J15 = POT VDSLVL set from
potentiometer
J15 = EXT VDSLVL set from
VDS_EXT
J13 = Populated VDSLVL is disabled (100
kΩ to GVDD)
J13 = DNP VDSLVL is enabled
R92 Sets VDSLVL from 0.1
V-2.5 V
H DRV8328 A/B or C/D
select
0-ohm resistors to
populate depending of
variant of DRV8328 used
on the EVM.
R1-R10 = DNP, R11 – R21
= 0-ohm
DRV8328A is populated
DRV8328B is populated
R1-R10 = 0-ohm, R11 –
R21 = DNP
DRV8328C is populated
DRV8328D is populated
I DRVOFF switch Turns off the gate driver
outputs.
S2 = Down Drivers are on
S2 = Up Drivers are off (DRVOFF
is enabled)
J Phase voltage feedback Resistor divider and
filtering capacitor for
phase voltage feedback to
MCU ADCs.
R67, R70, C45 Phase A voltage feedback
R68, R71, C46 Phase B voltage feedback
R69, R72, C47 Phase C voltage feedback
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(C) Power stage MOSFETs
and passive components
(G) VDSLVL
pot, select,
and disable
jumpers
(F) Hall
Power select
(E) Dead time
potentiometer,
jumper, & resistor
(I) DRVOFF
switch
(A) nSLEEP
switch
(B) External
CSA output
filter
(H) DRV8328
A/B or C/D
select
(D) LDO enable and
LDO output enable
jumpers
(J) Phase
voltage
feedback
(K) Speed
pot
Figure 3-6. User-adjustable jumpers, resistors, and switches on DRV8328AEVM
3.4.1 DRV8328A/B Compatibility
The DRV8328AEVM default is the DRV8328A (Hardware variant), but can also be compatible with the
DRV8328B. The main difference is that DRV8328A operates in 6x PWM mode and DRV8328B operates in 3x
PWM mode. Figure 3-7 shows the default resistors to select the A/B variant when the DRV8328A or DRV8328B
is used. Ensure resistors R1-R10 are removed, C1 is removed, and resistors R11-R21 are populated (except
R16).
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Figure 3-7. Resistors to populate for DRV8328A/B device
Table 3-3 shows the resistors to be only populated as well as their pin and functions.
Table 3-3. DRV8328A/B pinout, function, and populated resistors
DRV8328A/B Pin Function Populated Resistors
18 INHC R11
19 INHB R12
20 INHA R13
21 INLC R14
22 INLB R15
23 INLA R17
24 nFAULT R18
25 nSLEEP R19
26 VDSLVL R20
27 DT R21
3.4.2 DRV8328C/D Compatibility
The DRV8328AEVM is also compatible with the DRV8328C and DRV8328D variants to spin a 3-phase
Brushless-DC motor but requires modifications to the EVM. The main modifications are removing and populating
the correct 0-ohm resistors so pins of the DRV8328C/D variants are properly configured for their functions.
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The DRV8328C and DRV8328D device remove the VDSLVL and dead time pins and are replaced with a
DRVOFF shutdown pin and LDO (AVDD). The main difference between the two devices are that DRV8328C
operates in 6x PWM mode and DRV8328D operates in 3x PWM mode.
Figure 3-8 shows the default components to select the C/D variant when the DRV8328C or DRV8328D is used.
Ensure resistors R11-R21 are removed, resistors R1-R10 are populated, and C1 is populated. You can use the
spare capacitor C45 to populate to C1.
It is also good to remove J8 and J16 to prevent AVDD from back-powering into the external LDO since AVDD
comes from the DRV8328C/D.
Figure 3-8. Resistors to populate for DRV8328C/D device
Table 3-4 shows the resistors to be only populated as well as their pin and functions.
Table 3-4. DRV8328C/D pinout, functions, and populated resistors
DRV8328C/D Pin Function Populated Components
18 DRVOFF R6
19 AVDD R4/C1
20 INHC R2
21 INHB R7
22 INHA R5
23 INLC R3
24 INLB R8
25 INLA R1
26 nSLEEP R10
27 nFAULT R9
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3.5 Interfacing DRV8328AEVM and LAUNCHXL-F280049C LaunchPad
The DRV8328AEVM has 40 pins with different functions. These pins are interfaced with the LAUNCHXL-
F280049C LaunchPad development kit and are mapped appropriately to receive the functionalities of the
DRV8328 device. These 40 pins are grouped into 4 ports in respect to the LAUNCHXL-F280049C (J1 to J4).
Table 3-5 and Table 3-6 list the interfacing of these ports of the DRV8328AEVM headers J3 and J4.
Table 3-5. Connections for Header J3 on DRV8328AEVM (DNP in bold)
J3 Pin Number DRV8328AEVM Function LAUNCHXL-F280049C Function Description
1AVDD (DNP) +3.3 V 3.3 V LaunchPad Supply
2 +5 V +5 V 5 V LaunchPad Supply
3 POT_MCU/NC_49C PGA1/3/5_GND Not used
4 GND GND GND connection
5 Not used GPIO13/SCIBRX Not used
6 VSENA ADCINA5 Phase A Voltage Sense
7 Not used GPIO40/SCIBTX Not used
8 VSENB ADCINB0 Phase B Voltage Sense
9nSLEEP_DFLT NC nSLEEP for internal use only.
10 VSENC ADCINC2 Phase C Voltage Sense
11 CTAP ADCINB3/VDAC Center tap voltage sense.
12 VSENPVDD ADCINB1 PVDD Bus Voltage Sense
13 Not used SPIACLK Not used
14 NC_MCU/POT_49C ADCINB2 General Purpose pot for MCU
(R90)
15 nFAULT_DFLT ADCINC4 nFAULT for internal use only.
16 ISENA ADCINC0 LSS current sense
17 Not used GPIO37 Not used
18 Not used ADCINA9 Not used
19 Not used GPIO35 Not used
20 VDSLVL/C_TAP ADCINA1/DACB_OUT VDSLVL from DAC. C_TAP for
internal use only.
Table 3-6. Connections for Header J4 on DRV8328AEVM
J4 Pin Number DRV8328AEVM Function LAUNCHXL-F280049C Function Description
1 INHA GPIO10/PWM6A PWM used to switch Phase A
High-side FET
2 GND GND GND connection
3 INLA GPIO11/PWM6B PWM used to switch Phase A
Low-side FET
4 MCU_LED SPIASTE Visual feedback for LaunchPad
connection.
5 INHB GPIO8/PWM5A PWM used to switch Phase B
High-side FET
6nFAULT_DFLT NC nFAULT for internal use only.
7 INLB GPIO9/PWM5B PWM used to switch Phase B
Low-side FET
8 Not used NC Not used
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Table 3-6. Connections for Header J4 on DRV8328AEVM (continued)
J4 Pin Number DRV8328AEVM Function LAUNCHXL-F280049C Function Description
9 INHC GPIO4/PWM3A PWM used to switch Phase C
High-side FET
10 Not used XRSn Not used
11 INLC GPIO5/PWM3B PWM used to switch Phase C
Low-side FET
12 Not used SPIASIMO Not used
13 HALLA GPIO58 Hall sensor A from motor
14 Not used SPIASOMI Not used
15 nSLEEP_49C GPIO30 nSLEEP signal (active low)
16 DRVOFF GPIO39 Active-high output to disable gate
drivers
17 Not used GPIO18*/XCLKOUT Not used
18 HALLB GPIO23/LED4 Hall sensor B from motor
19 nFAULT_49C/CSAREF GPIO25 nFAULT signal (active low)
20 HALLC GPIO59 Hall sensor C from motor
Note
There are many resistors that are not populated for internal use only. Ensure the correct resistors are
populated so every has signal has only signal path. If multiple signal paths are present, or no signal
path is present, the device may not work as intended.
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4 Hardware Setup
The hardware required to run the motor control is the LAUNCHXL-F280049C LaunchPad development kit, the
DRV8328AEVM, a Micro-USB cable, and a power supply with a DC output from 4.5-V to 60-V. Follow these
steps to set up the evaluation module:
1. Ensure all resistors, jumpers, and switches are set up accordingly according to the device variant used. The
DRV8328AEVM by default is populated with and configured for the DRV8328A. If using the DRV8328C or
DRV8328D, please follow Section 3.4.2 to configure the board for the DRV8328x device variant populated
for U1.
2. Mate the DRV8328AEVM board to the top half of the LAUNCHXL-F280049C LaunchPad development
kit (mates to J1/J3 and J2/J4 of LaunchPad, as in Figure 3-3). Observe the correct orientation when
placing DRV8328AEVM to the LAUNCHXL-F280049C. The motor and power connectors should face to the
LaunchPad’s Micro-USB connector.
3. Connect the three phases from the brushless-DC motor to the 3-pin connector J12 on DRV8328AEVM.
Phases OUTA, OUTB, and OUTC are labeled in white silkscreen on the PCB top layer. If using a sensored
algorithm on the LaunchPad development kit, connect Hall sensors to the 5-pin connector J10.
4. Connect the DC power supply to header J9. Observe the correct polarity PVDD and GND connections on
the DRV8328AEVM connector J9.
5. Connect a Micro-USB cable to the LaunchPad development kit and computer.
6. Turn on the power supply and power up the PCB.
If using the DRV8328AEVM with an external microcontroller, make the connections needed on the male headers
on the top of the board or female connectors on the bottom side of the board.
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5 Firmware and GUI Application
The DRV8328AEVM can implement sensored, sensorless, or Field-oriented control for commutating a 3-phase
Brushless-DC motor. The GUI for the DRV8328AEVM supports sensored trapezoidal commutation using Hall
sensor feedback and allows for basic trapezoidal motor control functions such as acceleration, duty cycle
control, PWM switching frequency, MCU dead time insertion, braking, and direction changes. The bus and phase
voltage feedback circuits as well as the external CSA provide voltage and current feedback from the motor for
over-current and motor voltage protection.
There are two versions of the GUI. The DRV8328A-DRV8328C-EVM-GUI only supports the “A” and "C" versions
of the DRV8328, and the DRV8328B-DRV8328D-EVM-GUI only supports the "B" and "D" versions of the
DRV8328.
Variant GUI
DRV8328A DRV8328AEVM GUI
DRV8328B DRV8328BEVM GUI
DRV8328C DRV8328CEVM GUI
DRV8328D DRV8328DEVM GUI
To access the GUI, please visit https://dev.ti.com/gallery/search/drv8328 . You must register a TI account in order
to access the Gallery.
5.1 Connecting to the DRV8328AEVM-GUI
Follow the instructions in Section 5 and ensure the LAUNCHXL-F280049C is connected to the PC. Turned on
the supply to power the DRV8328AEVM and LAUNCHXL-F280049C.
Access the GUI Composer Gallery and search for "DRV8328AEVM-GUI" as shown in Figure 5-1. Click on the
GUI.
Figure 5-1. DRV8328AEVM-GUI tile in the Gallery
Accept the readme that appears. The GUI will detect the LAUNCHXL-F280049C and automatically download the
program into the MCU. Once complete, the “Hardware Connected” message appears at the bottom left hand
corner as shown in Figure 5-2.
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Figure 5-2. Hardware Connected message in the bottom-left hand corner
As shown in Figure 5-3, the following defaults should appear when the GUI is connected:
•Direction – Enabled
•PWM Frequency (Hz) – 20000
•MCU Dead Time (ns) – 0
•Acceleration Delay (ms/1% duty cycle) – 21
Figure 5-3. DRV8328AEVM-GUI loaded with default settings
5.2 DRV8328AEVM-GUI Quick Start Guide
1. Enter the PWM frequency in Hz using the “PWM Frequency (Hz)” text box. Press Enter.
2. Adjust the MCU dead time and Acceleration Delay values. For DRV8328A/B, it is recommended to use the
DT potentiometer and set MCU dead time to 0 ns.
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3. Click on the “Output Enable” switch.
4. To control the motor speed using the potentiometer R91, turn the potentiometer all the way counterclockwise
to set to 0% speed. Click on the “Potentiometer Enable” switch to use the potentiometer to control the speed
of the motor. If you do not wish to use the potentiometer, skip this step.
5. Turn the potentiometer clockwise or adjust the “Duty Cycle” slider to control the speed of the motor from 0%
to 100%.
6. Use the “Direction” switch to switch the direction of the motor.
7. Use the drop-down menu in “Motor Braking” to determine the motor braking type. Click on “Stop Motor” to
stop the method with the selected braking type.
5.3 Using the DRV8328AEVM-GUI
The GUI offers the following features:
MOTOR CONTROL SETTINGS
Output Enable – Global enable flag to run the motor at the selected duty cycle.
Potentiometer Enable – Enables potentiometer R90 to control the duty cycle of the motor. Duty cycle is
updated in the Duty Cycle slider in real time. Turn all the way clockwise for 0% duty cycle, all the way
counterclockwise for 100% duty cycle.
Direction – Sets direction of the motor. When enabled, motor spins counterclockwise. When disabled, motor
spins clockwise. When the direction is changed, the motor will coast to a stop, wait 1 second, then accelerate to
the duty cycle in the opposite direction.
nSLEEP – Places the DRV8328 in a low-power sleep mode. nSLEEP toggle switch only works when resistor
R26 is populated and resistor R75 is DNP.
DRVOFF (DRV8328C/D only) – Disables all gate drivers in Hi-Z state.
PWM Frequency – Sets the PWM switching frequency of the motor in Hz.
MCU Dead Time – Sets the MCU dead time to the PWM inputs in ns. Recommended to set DT to the minimum
on the DRV8328A/B by setting placing 0-ohm resistor for R91.
Duty Cycle – Sets the duty cycle of the motor when potentiometer is disabled.
Acceleration Delay – Sets the acceleration and deceleration ramp rate in ms per 1% duty cycle.
MOTOR BRAKING SETTINGS
Stop Motor – Stops the motor when toggled according to the braking method in the drop-down menu. The two
methods are brake (turn on all low-side MOSFETs) and coast (float all MOSFETs).
EXTERNAL CSA SETTINGS
Over-current Limit – Sets the overcurrent limit in amps. If ISEN is measured to be over the overcurrent limit,
Over-Current fault is triggered.
Current Sense Resistor – Sets the resistor value in ohms for the shunt resistor onboard the EVM. Default
resistor populated is 0.001 ohm.
CSA Gain – Gain of the external CSA on the EVM. Fixed at 20 V/V.
FAULT STATUS BITS
Fault Status – Logical “or” of all faults. When a fault occurs, output enable is set to 0 and duty cycle is set to 0
and Fault Status bit is set.
PVDD Overvoltage Fault – PVDD is over 60 V.
PVDD Undervoltage Fault – PVDD is under 4.5 V.
Over-Current – Measured LSS current is over the Over-Current threshold.
DRV8328 Fault – Fault indicated by the DRV8328. See DRV8328 datasheet.
www.ti.com Firmware and GUI Application
SLVUCD3 – NOVEMBER 2021
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DRV8328xEVM User's Guide 19
Copyright © 2021 Texas Instruments Incorporated

6 Schematics
6.1 DRV8328A/B/C/D
Figure 6-1. DRV8328A/B/C/D Schematic
Schematics www.ti.com
20 DRV8328xEVM User's Guide SLVUCD3 – NOVEMBER 2021
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Copyright © 2021 Texas Instruments Incorporated