Texas Instruments MCT8317 User manual

EVM User's Guide: MCT8317EVM
MCT8317EVM Evaluation Module
ABSTRACT
This document is provided with the MCT8317 customer evaluation module (EVM) as a supplement to the
MCT8317x data sheet (MCT8317 Three-Phase Sensorless-Trapezoidal BLDC Motor Driver). This User's Guide
details the hardware implementation of the EVM and how to setup and power the board.
Table of Contents
1 Cautions and Warnings..........................................................................................................................................................1
2 Introduction.............................................................................................................................................................................2
3 Quick Start Guide....................................................................................................................................................................2
4 Hardware and Software Overview.........................................................................................................................................3
4.1 Hardware Connections Overview – MCT8317EVM........................................................................................................... 3
4.2 Connection Details............................................................................................................................................................. 4
4.3 MSP430FR2355 Microcontroller & User Interface............................................................................................................. 6
4.4 LED Lights..........................................................................................................................................................................7
4.5 User-Configurable Settings................................................................................................................................................ 8
5 Hardware Setup.......................................................................................................................................................................9
6 MCT8317A GUI Application....................................................................................................................................................9
6.1 Running the GUI................................................................................................................................................................ 9
6.2 Offline Installer................................................................................................................................................................. 10
7 MSP430FR2355 Interface Firmware.................................................................................................................................... 10
7.1 Downloading Code Composer Studio and Importing MSP430FR2355 Interface Firmware Code...................................10
7.2 Using the eZ-FET to Program the MSP430FR2355.........................................................................................................11
8 Schematics............................................................................................................................................................................12
8.1 Main Supply and Pi Filter................................................................................................................................................. 12
8.2 Connectors and Interface.................................................................................................................................................13
8.3 USB to UART................................................................................................................................................................... 13
8.4 MCU Programming and Debug........................................................................................................................................14
8.5 MSP430FR2355 MCU..................................................................................................................................................... 14
8.6 MCT8317 3-Phase Sensorless Trapezoidal Integrated Driver.........................................................................................15
8.7 Status LEDs..................................................................................................................................................................... 15
8.8 Switches and Speed Input............................................................................................................................................... 16
9 Revision History................................................................................................................................................................... 16
Trademarks
LaunchPad™ is a trademark of Texas Instruments.
All trademarks are the property of their respective owners.
1 Cautions and Warnings
Observe the following cautions and warnings as printed on the EVM board.
HOT SURFACE:
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Caution Hot Surface! Contact may cause burns. Do not touch. Please take the proper
precautions when operating.
2 Introduction
The MCT8317 is a 4.5-V to 20-V, 5-A peak integrated three-phase gate driver IC with sensorless trapezoidal
for motor drive applications. It provides three accurately trimmed and temperature compensated half-bridge
MOSFETS, gate drivers, charge pump, current sense amplifier, linear regulator for the external load and
adjustable buck regulator. The I2C interface variant (MCT8317) also provides a standard I2C interface for
configuring the various device settings and reading fault diagnostic information through an external controller.
The MCT8317EVM includes an onboard FTDI chip to convert USB communication from the micro-USB
connector into UART and an onboard MSP430FR2355 MCU to interface with the MCT8317. It can also provide
SPI communication for the SPI variant of the MCT8317 device. There are many user-selectable jumpers,
resistors, connectors, and test points to evaluate many features of the device and configure device-specific
settings.
This document serves as a startup guide to supplement the MCT8317EVM. It is intended for engineers to
design, implement, and validate reference hardware for the MCT8317 device.
Figure 2-1. MCT8317EVM Printed Circuit Board (PCB - Top View)
3 Quick Start Guide
The MCT8317EVM requires a power supply source, which has a recommended operating range from a 4.5-V to
20-V. To setup and power the EVM, follow the sequence below:
1. Connect motor phases to A, B, C on connector J8.
2. Do not turn on the power supply yet. Connect motor supply to VBAT/VM and PGND on connector J7.
a. To enable reverse polarity protection and Pi filter, connect to VBAT. Note that when connecting to VBAT,
VM will be VM – 0.7 V less, due to a diode drop in the reverse-polarity protection circuit.
b. To disable reverse-polarity protection and the Pi filter, connect to VM.
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3. Select J3 to 5V_USB and J5 to 3V3COM to power MSP430 from USB power supply.
4. Connect the micro-USB cable into the computer.
5. Turn the potentiometer fully clockwise to set the motor to zero speed upon powerup.
6. Flip the switch S1 to the right to configure BRAKE = RUN and switch S2 to the left to configure DIR = ABC.
7. Turn on the motor power supply.
8. Use the potentiometer R4 to control the speed of the motor and the switches to disable the motor driver,
change the direction, or apply a brake to the motor. Optionally, use the GUI (as shown in Section 6) to
monitor real-time speed of the motor, put the MCT8317 into a low-power sleep mode, and read status of the
LEDs.
Figure 3-1. Reference for Quick Start Guide
4 Hardware and Software Overview
4.1 Hardware Connections Overview – MCT8317EVM
Figure 4-1 shows the major blocks of MCT8317EVM evaluation module. The MCT8317EVM is designed for
an input supply from 4.5-V to 20-V. The MCT8317 includes three integrated half-bridges and implements a
sensorless Trapezoidal algorithm to spin a motor with up to 5-A peak current.
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Figure 4-1. MCT8317EVM Major Hardware Blocks
4.2 Connection Details
Figure 4-2 shows the connections made to the MCT8317EVM in order to spin a 3-phase sensorless Brushless-
DC motor.
An 4.5-V to 20-V power supply or battery is connected to the VBAT or VM and PGND terminals on connector
J7. There is a reverse polarity protection and Pi filter implemented on the VBAT and PGND terminals. To bypass
the reverse polarity protection and Pi filter, connect the power supply to the VM terminal or VM test point on the
board and PGND.
The three phases of the BLDC motor connect directly to the A, B, and C terminals of the screw terminal
connector J8 provided on the MCT8317EVM.
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Figure 4-2. Connections from Motor to MCT8317EVM
Figure 4-3 MSP430FR2355 Microcontrollershows where the micro-USB cable is plugged into the MCT8317EVM
to provide communication between evaluation module and GUI. The USB data and 5 V power from the USB is
converted into UART data and 3.3 V power to power the MSP430FR2355 microcontroller. The 5 V from the USB
power is limited to 500 mA and the 3.3 V from the FTDI chip is limit to 30 mA. If the user wishes to supply more
current to these rails, they may use the 5V_SEL jumper J3 and 3V3_SEL jumper J5 to connect external power
rails.
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Figure 4-3. Micro-USB Connector and UART for MCT8317EVM
4.3 MSP430FR2355 Microcontroller & User Interface
The MCT8317EVM includes the MSP430FR2355 low-power MCU (as shown in Figure 4-4) to communicates via
I2C with the MCT8317.
In order to program the MSP430FR2355, an external MSP430 FET programmer must be connected to the Spy-
Bi-Wire (SBW) interface connector J4. Many MSP430 LaunchPad™ provide an onboard eZ-FET Debug Probe
that can be jumper-wired to the MCT8317EVM to flash the firmware into the MSP430FR2355 microcontroller.
The user can use the Reset (RST) button at any time to reset and restart the MCU program. Two active-low
LEDs, D6 and D7, can be used for debug purposes as well.
Finally, a shunt jumper bridge on the 32-pin connector J6 ties all signals between the microcontroller and
MCT8317. These jumpers can be inserted or removed as needed in order to isolate the microcontroller from the
gate driver. This allows for microcontroller signal debugging or using the MCT8317EVM as a standalone gate
driver with an external microcontroller.
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Figure 4-4. MSP430FR2355 MCU and User Interface on MCT8317EVM
4.4 LED Lights
The MCT8317EVM has 7 status LEDs implemented that provide the status of power supplies and functionalities
of the evaluation module. By default, the VM LED and 3.3 V Buck LEDs will light up when the board is powered
and the program has been flashed onto the microcontroller. Table 4-1 shows LED descriptions including those
that are on during power up in bold and Figure 4-5 shows the locations of the LEDs.
Table 4-1. Description of MCT8317EVM LEDs (default in bold after powerup)
Designator Name Color Description
D1 AVDD GREEN Lights up when AVDD is turned ON.
D2 nFAULT Red Lights up when fault condition has occurred on MCT8317
D3 ALARM Red Lights up when alarm condition has occurred on MCT8317
D4 VM Green Lights up when voltage is applied on VM.
D6 MSP_LED1 Red Used for UART or debugging
D7 MSP_LED2 Red Used for UART or debugging
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Figure 4-5. MCT8317EVM LEDs
4.5 User-Configurable Settings
The MCT8317EVM includes a variety of user-selectable jumpers, switches, and resistors on the entirety of the
evaluation board to configure settings. Table 4-2 summarizes all of these configurable settings.
Table 4-2. Description of User-Selectable Settings on MCT8317EVM (Default in Bold)
Designator Setting Name Description Layer Position Function
J5 3V3_SEL Select 3.3 V for MCU power Top J5 = 3V3EXT External
J5 = 3V3COM From FTDI (30 mA)
J3 5V_SEL Select 5 V for FTDI power Top J3 = 5V_EXT External
J3 = 5V_USB From USB power
(500 mA)
J1 SPEED_SEL Selects SPEED input source Top J1 = EXT External
EXT_SPEED test
point
J1 = POT From
Potentiometer R4
J1 =
INT_PWM
From internal PWM.
PWM Duty cycle can
be varied by rotating
the POT R4.
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Table 4-2. Description of User-Selectable Settings on MCT8317EVM (Default in Bold) (continued)
Designator Setting Name Description Layer Position Function
J6 MSP to MCx Shunt
jumper bridge
Connects signals from MCU and
user switches to MCx8316A when
jumpers are inserted
Top NC NC
DIR_SW DIR
BRAKE_SW BRAKE
SPEED_IN SPEED/WAKE
MSP_SOMI/SCL MCx_SCL
MSP_SIMO/SDA MCx_SDA
MSP_CLK NC
MSP_STE NC
MSP_A3 DACOUT2/SOX
MSP_A2 DACOUT2
MSP_A1 DACOUT1
MSP_ALARM ALARM
MSP_nFAULT nFAULT
MSP_FGOUT FGOUT
NC NC
AGND AGND
S1 BRAKE Turns on all low-side MOSFETs Top Left Brake enabled
Right Brake disabled
S2 DIR Controls direction of motor Top Left ABC
Right ACB
5 Hardware Setup
The hardware required to run the motor is the MCT8317EVM, a Micro-USB cable, and a power supply with a DC
output from 4.5-V to 20-V. Follow these steps to start up the MCT8317EVM:
1. Connect the DC power supply to header J7. Connect to VBAT and PGND to apply reverse polarity protection
and the pi filter to the EVM. Otherwise, connect to VM and PGND to bypass the reverse polarity protection
and pi filter.
2. Apply user configurable jumper settings. See Section 4.5 section for more information.
3. Flash program into the MCU as described in Section 4. Launch the GUI in GUI Composer and disconnect
the 4-pin JTAG connections.
4. Connect a Micro-USB cable to the MCT8317EVM and computer.
5. Turn on the power supply and power up the PCB.
If using the MCT8317EVMj with an external microcontroller, remove all shunt jumpers from jumper bridge J6.
Connect with external jumpers to the left side of the jumper bridge from the external MCU.
6 MCT8317A GUI Application
The MCT8317EVM includes a USB-UART interface, using a MSP430FR2355 microcontroller, that serves as a
communication bridge between a host PC and the MCT8317 device for configuring various device settings and
reading fault diagnostic information. A MCT8317A GUI is available to interface with and configure the MCT8317
using this communication interface.
Access the MCT8317A GUI through the TI Cloud Gallery.
6.1 Running the GUI
The MCT8317A GUI can be run directly inside a web browser (supported in Google Chrome and Firefox).
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Figure 6-1. MCT8317A GUI
Once the GUI is loaded, follow the step-by-step Guided Tuning section of the GUI to configure the device.
6.2 Offline Installer
Alternatively, the MCT8317A GUI can be downloaded and installed offline using the download feature in the TI
Cloud Gallery. Here are the steps to install offline MCT8317A GUI.
1. Go to dev.ti.com/gallery and search for "MCT8317".
2. Place the cursor on the download (down arrow) button.
3. Select the approprioate operating system (Linux, MAC or Windows) and click the operating system. (Note:
Do not click the runtime)
4. A zip file will begin downloading. Unzip the file and click the .exe file to install the offline MCT8317A GUI.
7 MSP430FR2355 Interface Firmware
The MSP430FR2355 on the MCT8317EVM comes pre-programmed with the firmware necessary for
communicating with the PC GUI and the MCT8317. In order to reprogram or flash custom code on the
MSP430FR2355, you will need an external MSP430 LaunchPad™that includes the eZ-FET Debug Probe. In
this example, we use the MSP-EXP430FR2355 LaunchPad Development Kit to provide the debug probe. Follow
the steps below to download the code for the MCT8317EVM to use with the GUI.
7.1 Downloading Code Composer Studio and Importing MSP430FR2355 Interface Firmware
Code
1. Extract the “MCT8317EVM_MSP430FR2355_Firmware_GUI.zip” to a location on the computer.
2. Download the latest version of Code Composer Studio. This will set up a ti folder in the directory C:\ti.
a. Accept all agreements, default install locations, and hit “Next” to proceed through menus.
b. In the “Select Components” window, ensure to check “MSP430 Low-Power MCUs” to install the required
packages for the MSP430 LaunchPad Evaluation Kits.
3. After installing, run CCS and select a folder or the default to use as the Workspace to store any new
projects. The location and naming convention can be changed based on the user's preference. Click the OK
button to accept.
4. In CCS, click on the Project tab and select “Import CCS Projects”. Click on Browse.
5. Select the “MCT8317EVM_MSP430FR2355_Firmware_GUI” folder installed from step 1.
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6. Import the project “MCT8317EVM_MSP430FR2355_Firmware_GUI” into your workspace as shown in
Figure 7-1.
Figure 7-1. MSP430FR2355 Interface Firmware Code in Code Composer Studio
7.2 Using the eZ-FET to Program the MSP430FR2355
The eZ-FET Debug Probe on the MSP430FR2355 LaunchPad uses a SPI-by-Wire JTAG interface to program
the MSP430FR2355 MCU on the MCT8317EVM. Consult the MSP430 LaunchPad Development Kits for
MSP430 LaunchPads that include an onboard eZ-FET Debug Probe.
1. Remove the GND, 3V3, SBWTDIO, and SBWTCK jumpers from the MSP430 LaunchPad.
2. Connect the top pins on the eZ-FET side of the LaunchPad of the GND, 3V3, SBWTCK, and SBWTDIO
signals to their respective pins on J4 of the MCT8317EVM as shown in Table 7-1 and Figure 7-2.
3. Connect a micro-USB cable to the MSP430 LaunchPad and the PC.
4. Click on the Build Project icon or “Ctrl” + B to ensure the project builds successfully. Accept any updates if
needed from the Console.
5. Click on Debug Project to set up a debug session and press the Play button to run the code.
6. Stop the debug session, close Code Composer Studio, disconnect the SPI-by-Wire jumpers, and unplug the
micro-USB cable from the MSP430 LaunchPad.
Table 7-1. SPY-BI-Wire Connections Needed to Program MSP430FR2355
MSP430 LaunchPad™ (eZ-FET Debug Probe Side) (J101) MCT8317EVM 4-pin SPI-by-Wire Header (J4)
GND GND
3V3 3.3V
SBWTDIO SBWTDIO
SBWTCK SBWTCK
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Figure 7-2. MSP430 LaunchPad™ eZ-FET Probe Connected to MCT8317EVM
8 Schematics
8.1 Main Supply and Pi Filter
VBAT
0.01uF
C19
VM
0.1uF
C18
1000pF
C20
PGND
VCP
10k
R34
10k
R35
VM
0.01uF
C22
1000pF
C21
0.1uF
C23
3
1
2Q1
PGND
3
4 1
5
6
7
8 2
Q2
BUK9D 23-40EX
330uF
C16
bypass RPP
PGND
VBAT
VM
Connect to VM to
1
2
3
J7
MOTOR_OUT
Reverse Polarity Protection
Pi Filter
100V
1uF
C17
100V
1uF
C24
D8
CDSU101A
1
2
JP1
VMVIN_AVDD
SNT-100-BK-G
VIN_AVDD
1uH
L4
4.5-V to 20-V Operation
24V ABS MAX
Figure 8-1. Main Supply and Pi Filter Schematic
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8.2 Connectors and Interface
Figure 8-2. Connectors and Interface Schematic
8.3 USB to UART
Figure 8-3. USB to UART Schematic
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8.4 MCU Programming and Debug
Figure 8-4. MCU Programming and Debug Schematic
8.5 MSP430FR2355 MCU
Figure 8-5. MSP430FR2355 MCU Schematic
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8.6 MCT8317 3-Phase Sensorless Trapezoidal Integrated Driver
1µF
6.3V
C5
AVDD
3
AVDD
23
DVDD
1
VI N_AVDD
7
VM
8
VM
9
VM
20
VM
21
OUTA 11
OUTA 12
OUTB 14
OUTB 15
OUTC 17
OUTC 18
EXT_CLK
30
EXT_WD
29
DACOUT1
34
DACOUT2
33
DACOUT2/S Ox
32
FAULT
36
ALARM
35
BRAKE
31
CP 6
CPH 5
CPL 4
DI R
28
FG
25
SCL
27
SDA
26
SPEED/W AKE
24
Therm al_Pad 37
AGND 22
DGND 2
PGND 10
PGND 13
PGND 16
PGND 19
MCT8317A0IREER
U1
AGND
AGND
1µF
6.3V
C3
50V
0.1uF
C4
63V
10uF
C6
SPEED/WAKEEXT_WD EXT_CLK
EXT_CLK
EXT_WD
DACOUT1
DACOUT2
DACOUT2/SOX
BRAKE
DIR
FG
nFAULT
AVDD
DVDD
VM
VIN_AVDD
AVDD
AVDD
AVDD
SCL
SDA
0R15
0R16
MCX_SCL
MCX_SDA AGND
PGND
AGND
CPH
CPL
VCP
1µF
16V
C1
VCP
OUTA
OUTB
OUTC
OUTA
OUTB
OUTC
ALARM
DACOUT1
DACOUT2
DACOUT2/SOX
FG
AVDD
DVDD CP
SPEED/WAKE
PGND PGND
50V
0.1uF
C7
10.0k
R10
1.74k
R14 1.74k
R13
Figure 8-6. MCT8317 3-Phase Sensorless Trapezoidal Integrated Driver Schematic
8.7 Status LEDs
VM LED
VM
nFAULT LEDAVDD LED
nFAULT
4.70k
R20
AGND PGND
Green
1
2
D1
Green
1
2
D4
Red
1
2
D2
ALARM LED
ALARM
Red
1
2
D3
AVDD AVDD
AGND
2.2k
R19
1.00k
R17
1.00k
R18
Figure 8-7. Status LEDs Schematic
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8.8 Switches and Speed Input
AVDD AVDD
2
1
3
S1
2
1
3
S2
DIR_SW
BRAKE_SW DIR_SW
BRAKE_SW
AGND AGND
Add arrows on silk screens
R4
AVDD
For Analog speed control/internal PWM Speed Control/External PWM speed control
SPEED_IN
1 2
3 4
5 6
J1
SPEED_CTRL_SEL
MSP_TB0.1
POT
EXT_SPEED
TP1
47.0
R9
0
R5
100pF
10V
C2
AGND
AGND
10.0k
R1
10.0k
R6
10.0k
R2
10.0k
R7
Figure 8-8. Switches and Speed Input
9 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
DATE REVISION NOTES
December 2022 * Initial Release
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