Texas Instruments MCT8316AEVM User manual

User’s Guide
MCT8316AEVM Evaluation Module
ABSTRACT
This document is provided with the MCT8316A customer evaluation module (EVM) as a supplement to the
MCT8316A data sheet (MCT8316A Three-Phase Sensorless Trapezoidal Control 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..........................................................................................................................................................2
2 Introduction.............................................................................................................................................................................3
3 Quick Start Guide....................................................................................................................................................................4
4 Hardware and Software Overview.........................................................................................................................................5
4.1 Hardware Connections Overview – MCT8316AEVM.........................................................................................................5
4.2 Connection Details............................................................................................................................................................. 5
4.3 MSP430FR2355 Microcontroller & User Interface............................................................................................................. 7
4.4 LED Lights..........................................................................................................................................................................8
4.5 User-Configurable Settings................................................................................................................................................ 9
5 Hardware Setup.....................................................................................................................................................................11
6 MCT8316A GUI Application..................................................................................................................................................12
6.1 Running the GUI.............................................................................................................................................................. 12
6.2 Offline Installer................................................................................................................................................................. 12
7 MSP430FR2355 Interface Firmware.................................................................................................................................... 14
7.1 Downloading Code Composer Studio and Importing MSP430FR2355 Interface Firmware Code...................................14
7.2 Using the eZ-FET to Program the MSP430FR2355........................................................................................................ 14
8 Schematics............................................................................................................................................................................16
8.1 Main Supply and Pi Filter................................................................................................................................................. 16
8.2 Connectors and Interface.................................................................................................................................................16
8.3 USB to UART................................................................................................................................................................... 17
8.4 MCU Programming and Debug........................................................................................................................................17
8.5 MSP430FR2355 MCU..................................................................................................................................................... 18
8.6 MCT8316A 3-Phase Sensorless Trapezoidal Control Integrated Driver..........................................................................18
8.7 Buck Regulator.................................................................................................................................................................19
8.8 Status LEDs..................................................................................................................................................................... 20
8.9 Switches and Speed Input............................................................................................................................................... 20
9 Revision History................................................................................................................................................................... 20
Trademarks
LaunchPad™ are trademarks of Texas Instruments.
All trademarks are the property of their respective owners.
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1 Cautions and Warnings
Observe the following cautions and warnings as printed on the EVM board.
HOT SURFACE:
Caution Hot Surface! Contact may cause burns. Do not touch. Please take the proper
precautions when operating.
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2 Introduction
The MCT8316A is a 4.5-V to 35-V, 8-A peak integrated three-phase gate driver IC with high speed
sensorless trapezoidal control 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 (MCT8316A) also provides a standard I2C
interface for configuring the various device settings and reading fault diagnostic information through an external
controller.
The MCT8316AEVM 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 MCT8316A. It can also provide
SPI communication for the SPI variant of the MCT8316A 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 MCT8316AEVM. It is intended for engineers to
design, implement, and validate reference hardware for the MCT8316A device.
Figure 2-1. MCT8316AEVM Printed Circuit Board (PCB - Top View)
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3 Quick Start Guide
The MCT8316AEVM requires a power supply source, which has a recommended operating range from a 4.5-V
to 35-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.
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, switch S2 to the left to configure DIR = ABC, and
switch S3 to the right to configure DRVOFF = ON
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 MCT8316A into a low-power sleep mode, and read status of
the LEDs.
Figure 3-1. Reference for Quick Start Guide
Quick Start Guide www.ti.com
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4 Hardware and Software Overview
4.1 Hardware Connections Overview – MCT8316AEVM
Figure 4-1 shows the major blocks of MCT8316AEVM evaluation module. The MCT8316AEVM is designed
for an input supply from 4.5-V to 35-V. The MCT8316A includes three integrated half-bridges and implements
a sensorless trapezoidal control algorithm to spin a motor with up to 8-A peak current. It also integrates an
adjustable buck regulator.
Figure 4-1. MCT8316AEVM Major Hardware Blocks
4.2 Connection Details
Figure 4-2 shows the connections made to the MCT8316AEVM in order to spin a 3-phase sensorless Brushless-
DC motor.
An 4.5-V to 35-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 MCT8316AEVM.
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Figure 4-2. Connections from Motor to MCT8316AEVM
Figure 4-3 shows where the micro-USB cable is plugged into the MCT8316AEVM 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 MCT8316AEVM
4.3 MSP430FR2355 Microcontroller & User Interface
The MCT8316AEVM includes the MSP430FR2355 low-power MCU (as shown in Figure 4-4) to communicates
via I2C with the MCT8316A.
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 MCT8316AEVM 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
MCT8316A. 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 MCT8316AEVM as a standalone
gate driver with an external microcontroller.
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Figure 4-4. MSP430FR2355 MCU and User Interface on MCT8316AEVM
4.4 LED Lights
The MCT8316AEVM has 5 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 MCT8316AEVM LEDs (default in bold after powerup)
Designator Name Color Description
D1 Buck Regulator Green Internal buck regulator is voltage output
D2 nFAULT Red Lights up when fault condition has occurred on MCT8316A
D3 ALARM Red Lights up when alarm condition has occurred on MCT8316A
D4 VM Green Motor power is supplied to the board
D5 MSP_LED1 Red Used for UART or debugging
D6 MSP_LED2 Red Used for UART or debugging
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Figure 4-5. MCT8316AEVM LEDs
4.5 User-Configurable Settings
The MCT8316AEVM 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 MCT8316AEVM (Default in Bold)
Designator Setting Name Description Layer Position Function
L1/L2/R9 Buck Regulator
mode
User populates L1, L2, or R9 to
choose switching component for
buck regulator
Top L1 = 47uH Inductor Inductor Mode
Bottom L2 = 22 μH Inductor Mode
Bottom R1 = 22 Ω Resistor Mode
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)
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Table 4-2. Description of User-Selectable Settings on MCT8316AEVM (Default in Bold) (continued)
Designator Setting Name Description Layer Position Function
J1 SPEED_SEL Selects SPEED input source Top J1 = EXT External
EXT_SPEED test
point
J1 = POT From
Potentiometer R4
J1 is removed Floating
J6 MSP to MCx Shunt
jumper bridge
Connects signals from MCU and
user switches to MCx8316A when
jumpers are inserted
Top DRVOFF_SW DRVOFF
DIR_SW DIR
BRAKE_SW BRAKE
SPEED_IN SPEED
MSP_SOMI/SCL MCx_SCL
MSP_SIMO/SDA MCx_SDA
MSP_CLK NC
MSP_STE NC
MSP_A3 DACOUT2/SOX
MSP_A2 MCX_DACOUT2/X2
MSP_A1 MCX_DACOUT1/X1
MSP_ALARM ALARM
MSP_nFAULT nFAULT
MSP_FGOUT FGOUT
NC VBK
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
S3 DRVOFF Disables gate drivers Top Left MCT8316A disabled
Right MCT8316A enabled
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5 Hardware Setup
The hardware required to run the motor is the MCT8316AEVM, a Micro-USB cable, and a power supply with a
DC output from 4.5-V to 35-V. Follow these steps to start up the MCT8316AEVM:
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. Launch the GUI in GUI Composer.
4. Connect a Micro-USB cable to the MCT8316AEVM and computer.
5. Turn on the power supply and power up the PCB.
If using the MCT8316AEVM 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.
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6 MCT8316A GUI Application
The MCT8316AEVM includes a USB-UART interface, using a MSP430FR2355 microcontroller, that serves as
a communication bridge between a host PC and the MCT8316A device for configuring various device settings
and reading fault diagnostic information. A MCT8316A GUI is available to interface with and configure the
MCT8316A using this communication interface.
Access the MCT8316A GUI through the TI Cloud Gallery.
6.1 Running the GUI
The MCT8316A GUI can be run directly inside a web browser (supported in Google Chrome and Firefox).
Figure 6-1. MCT8316A 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 MCT8316A GUI can be downloaded and installed offline using the download feature in the TI
Cloud Gallery.
MCT8316A GUI Application www.ti.com
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Figure 6-2. MCT8316A GUI Offline Installer
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7 MSP430FR2355 Interface Firmware
The MSP430FR2355 on the MCT8316AEVM comes pre-programmed with the firmware necessary for
communicating with the PC GUI and the MCT8316A. 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 MCT8316AEVM to use with the GUI.
7.1 Downloading Code Composer Studio and Importing MSP430FR2355 Interface Firmware
Code
1. Extract the “MCT8316AEVM_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 “MCT8316AEVM_MSP430FR2355_Firmware_GUI” folder installed from step 1.
6. Import the project “MCT8316AEVM_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 MCT8316AEVM. 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 MCT8316AEVM as shown in Table 7-1 and Figure 7-2.
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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) MCT8316AEVM 4-pin SPI-by-Wire Header (J4)
GND GND
3V3 3.3V
SBWTDIO SBWTDIO
SBWTCK SBWTCK
Figure 7-2. MSP430 LaunchPad™ eZ-FET Probe Connected to MCT8316AEVM
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8 Schematics
8.1 Main Supply and Pi Filter
Figure 8-1. Main Supply and Pi Filter Schematic
8.2 Connectors and Interface
Figure 8-2. Connectors and Interface Schematic
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8.3 USB to UART
Figure 8-3. USB to UART Schematic
8.4 MCU Programming and Debug
Figure 8-4. MCU Programming and Debug Schematic
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8.5 MSP430FR2355 MCU
Figure 8-5. MSP430FR2355 MCU Schematic
8.6 MCT8316A 3-Phase Sensorless Trapezoidal Control Integrated Driver
Figure 8-6. MCT8316A 3-Phase Sensorless Trapezoidal Control Integrated Driver Schematic
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8.7 Buck Regulator
Figure 8-7. Buck Regulator Schematic
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8.8 Status LEDs
Figure 8-8. Status LEDs Schematic
8.9 Switches and Speed Input
Figure 8-9. Switches and Speed Input Schematic
9 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Schematics www.ti.com
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