Texas Instruments DRV8334 User manual

EVM User's Guide: DRV8334EVM
DRV8334 Evaluation Module
Description
The DRV8334EVM is a 30 A, 3-phase brushless DC
drive stage based on the DRV8334 gate driver for
BLDC motors.
The EVM allows quick evaluation of the DRV8334
device which spins a BLDC motor with trapezoidal
commutation and control.
Status LEDs for all power supplies as well as a
Fault LED are included for user feedback. The C2000
launchpad (LAUNCHXL-F280049C) is required for
this kit and is used to control the DRV8334 as well
as monitor and report faults.
Features
• 4.5V to 60 V operation with support for 12 V/24 V
applications
• 100% duty cycle PWM control, with 1 A/2 A peak
gate drive
• 40+ configurable IDRIVE steps for fine slew rate
tuning
• 3x integrated CSAs with low input offset drift
Applications
•Appliances, cordless garden and power tools,
lawnmowers
•Brushless-DC (BLDC) motor modules and PMSM
•Fans, pumps, and servo drives
• E-bikes, e-scooters, and e-mobility
•Cordless vacuum cleaners
•Drones, industrial and logistics robots, and RC
toys
DRV8334EVM
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1 Evaluation Module Overview
1.1 Introduction
This document is provided with the DRV8334 customer evaluation module (EVM) as a supplement to the
DRV8334 data sheet. The user's guide details the hardware implementation of the EVM.
This document is designed to be used as a startup guide to the DRV8334EVM and LAUNCHXL-F280049C
device. This document is intended for the engineers involved in the design, implementation, and validation of
DRV8334 + TMS320F280049C reference software.
The scope of this document is to provide the user with a guide to evaluate the DRV8334 device with a
TMS320F280049C board. This document covers the hardware connections required between boards and
external motor/supplies. When the hardware connections are complete, the user can access the necessary
tools and software to spin a motor using the online GUI.
The reference software is composed of GuiComposer software with sensored trapezoidal algorithm for BLDC
motor control.
Figure 1-1. DRV8334EVM
CAUTION
The DRV8334EVM is designed to be evaluated only with the LAUNCHXL-F280049C MCU PCB,
which must be ordered separately.
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WARNING
Voltages exceeding the standard EVM ratings as specified on the data sheet can cause personal
injury, electrical shock hazard, damage the EVM, or a combination.
Additionally, do not leave power connections to the EVM connected while not in operation.
WARNING
Hot surface Contact can cause burns. Do not touch.
WARNING
High Voltage
For safety, use of isolated test equipment with overvoltage and
overcurrent protection is highly recommended.
Electric shock is possible when connecting board to live wire. The
board must be handled with care by a professional.
1.2 Kit Contents
Item Description Quantity
DRV8334EVM PCB 1
Box Cardboard box 1
Label Standard label 1
Foam Antistatic foam 2
Literature EVM disclaimers 1
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1.3 Specification
SOB
INHB GHC
SOA
INLB SHC
GND
INHC BSTC
CPL
INLC BSTB
CPH
SDO SHB
GVDD
SDI GHB
PVDD
SCLK GLB
CPTL
nSCS SLB
CPTH
nSLEEP SLA
VCP
nFAULT GLA
VDRAIN
VREF GHA
BSTA
SOC SHA
Not to scale
13 14 15 16 17 18 19 20 21 22 23 24
DRV8334
48-pin
25
26
27
28
29
30
31
32
33
34
35
36
12
11
10
9
8
7
6
5
4
3
2
1
PWR_PAD (0) - GND
GHA
SHA
GLA
SLA
RSENSE
VMOTOR
CBST
RG
RG
RGS RGS
GHB
SHB
GLB
SLB
RSENSE
CBST
RG
BSTB
RG
RGS RGS
GHC
SHC
GLC
SLC
RSENSE
CBST
RG
RG
RGS RGS
CBULK
VDRAIN
SPC
SNC
SPB
SNB
SPA
SNA
44 43 42 41 40 39 38
37
48 47 46 45
RnFAULT
VCCIO
VCCA
CVREF
RSO
CSO
SOC
SOx
SOB
SOA
BSTA
SNC
SNC
SNB
SPB
SNA
SPA
SLC
GLC
SHC
GHC
BSTB
BSTC
GHB
SHB
SLB
GLB
GLA
SLA
SHA
GHA
RBST
BSTA
RBST
BSTC
RBST
CVDRAIN
RSP
RSN
CSPSN
RSP
RSN
CSPSN
RSP
RSN
CSPSN
CSP
CSN
CSP
CSN
CSP
CSN
INLA
INHA
AGND
DRVOFF
SNC
SPC
SNB
SPB
SNA
SPA
SLC
GLC
CCP_FLY
CGVDD
CPVDD
CCPT_FLY
VBAT
RPVDD
GND
VDRAIN
CVCP
GND
Gate of
external
switches
VCP
Figure 1-2. 3-phase BLDC Driver Simplified Schematic
1.4 Device Information
The DRV8334 enables customers to evaluate their motor performance within their gate driver system. The
DRV8334 implements features such as enhanced Smart Gate Drive and expanded device protection features,
making the device an excellent choice for applications such as power tools, appliances, pumps, and fans. The
device supports both 12 V and 24 V applications while allowing up to 65 V PVDD abs max to support power
supply transients.
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2 Hardware
2.1 Hardware Connections Overview – DRV8334EVM + LAUNCHXL-F280049C
The following section describes the EVM hardware and connections to the external supply, hall sensors, PC via
USB, and motor.
Figure 2-1. EVM Board Overview
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Connect the DRV8334EVM board to the
LAUNCHXL-F280049C Launchpad top
posi

on (J1/J2/J3/J4). The DRV8334EVM
sits on Top of the launchpad.
Figure 2-2. DRV8334EVM Mating to LAUNCHXL-F280049C
The DRV8334EVM must plug into the LAUNCHXL-F280049C Launchpad headers closest to the USB port as
shown above.
Figure 2-3. VMOTOR Input (J10)
WARNING
To minimize the risk of potential shock hazard and personal injury, remove all power connections and
interfaces to the DRV8334EVM when not in use.
The DRV8334EVM is designed for an input supply from 4.5 VDC to 60 VDC and up to 30-A continuous drive
current (in-line fuse limited). The input connects to J10 with the noted polarity. VMOTOR test point connects to
the same node but must not be used for high current input. VMOTOR input is fused with a 30 A fuse and the
input connector is rated for 32 A.
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Figure 2-4. Hall Sensor Input and Power Connections (J11)
Hall sensors are connected to J11 including hall power and GND. The 3.3 VDC supply to the Hall sensors is
supplied from the 3.3 V LDO on the EVM. External hall power can be input through the HALL_EXT test point if a
different supply or voltage level is desired. To use the included 3.3 V LDO to power the halls, connect J12 on the
left side to pins 1:2 as shown. To use HALL_EXT, connect J12 on the right side to pins 2:3. To insert or remove
wires/terminals on J11, use a flat blade screwdriver to push down the respective tab on top of the J11 connector.
Figure 2-5. Motor Phase Connector (J13)
WARNING
Motor Phase connections must match the hall sensor connection sequence. For example, MOTA
must match HALL_A, MOTB must match HALL_B, MOTC must match HALL_C. The phases must
also be in sequential order; A, then B, then C.
If the motor phases do not match the hall sensors or the connections are made out of order, then the
motor does not spin smoothly and current consumption increases.
The three phase inputs of the motor connect to MOTA/MOTB/MOTC through connector J13.
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2.2 Faults, Indicators, and Jumper Settings
The DRV8334 implements Bootstrap Undervoltage, GVDD Undervoltage, and Thermal Shutdown in case of
overtemperature. See the DRV8334 data sheet for more information on DRV8334 fault support.
Status LEDs for the 3.3 V, PVDD, GVDD, and FAULT are included and shown below.
Figure 2-6. Status LEDs
The FAULT LED lights up if the EVM senses a fault and the same fault is reported in the SPI register. See the
complete data sheet for fault response and corrective actions.
The Faults can be reset in the GUI software using the CLEAR FAULTS button. More details on the GUI can be
found in Section 3.
Figure 2-7. On-Board PVDD Buck and 3.3V LDO
The EVM includes a buck regulator for reducing VMOTOR to 12 V in case PVDD regulation is required. The
buck feeds into the 3.3V LDO, which powers the EVM 3.3V rail.
Jumper J6 connects VMOTOR/PVDD to the PVDD buck. Remove this jumper to power down the buck regulator.
Jumper J7 connects the PVDD buck output (12V) to the 3.3V LDO. Remove this jumper to power down the 3.3V
rail.
GVDD is generated internally to the DRV8334 device and the options are explained in the complete data sheet.
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2.3 EVM Hardware Quick-Start
This section describes the steps to prepare the DRV8334EVM for first motor spin-up. This section assumes the
default jumper positions mentioned above are used.
1. Plug the DRV8334EVM onto the upper position of the LAUNCHXL-F280049C board.
2. Connect motor phase connections to their respective MOTA/MOTB/MOTC inputs on J13, making sure to
match A, B, and C.
3. Connect the Hall sensor connections, Hall power, and ground to J11. Make sure that Hall A, B, and C are in
the correct order.
4. Connect the provided micro-USB cable to the LAUNCHXL-F280049C.
5. Connect VMOTOR and GND to connector J10. A low current limit of 300 mA on the VMOTOR supply is
recommended for first power-up to verify the EVM is connected correctly. If there is no issue upon power-up,
then the current limit can be raised to allow for current based on your motor specifications. VMOTOR range
is 5 V to 60 V.
6. Start the GUI per the instructions below in Section 3.1.
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3 Software
3.1 DRV8334 EVM GUI Software
This section details the features of the EVM GUI Software. The GUI is written in GUI Composer and is available
on the development software gallery at dev.ti.com/gallery.
Figure 3-1. DRV8334EVM GUI Software
The GUI connects and programs the C2000 MCU on the LAUNCHXL-F280049C board when launched,
assuming the board is connected/powered.
Once the hardware is connected, the FAULT Status and Voltage Monitors match the EVM. If these do not match,
then please remove EVM power and recheck the setup.
To spin the motor:
1. Launch the GUI located on dev.ti.com/gallery.
2. Take the DRV8334 out of sleep mode by toggling nSLEEP to WAKE.
3. Enable the PWM using the Output Enable toggle switch.
a. The DRV8334 reports no faults (Fault LED green on GUI, no red nFAULT LED on the EVM) and
VMOTOR/GVDD voltage is reported by the GUI.
4. Set acceleration (update rate) of Duty cycle and increase PWM Duty Cycle using the slider or text input.
5. The motor now spins.
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To Read and Write SPI registers:
1. Enter the Address in Hex (0x00) in the Address (0x00) field.
2. Enter the data (for write transaction) in the Data (0x0000) field. For Read transactions, the data is Don’t
Care and is ignored.
3. Click anywhere on the screen to deselect the text input field.
4. Click SPI WRITE or SPI READ to send the command to the DRV8334. If the text field is not deselected first,
then click the SPI WRITE or SPI READ a second time to execute the transaction.
5. If the complete SPI readback is needed for a Read transaction, then the user can enable the full SPI
readback including the address/data/CRC using the checkbox.
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4 Hardware Design Files
4.1 Schematics
Figure 4-1. Schematic 1
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Figure 4-2. Schematic 2
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Figure 4-3. Schematic 3
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Figure 4-4. Schematic 4
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4.2 PCB Layouts
Figure 4-5. EVM Dimensions
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Figure 4-6. EVM Top Overlay
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Figure 4-7. EVM Top Layer
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Figure 4-8. EVM Signal Layer 1
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Figure 4-9. EVM Signal Layer 2
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