Texas Instruments MCT8316ZTEVM User manual

User’s Guide
MCT8316ZTEVM Evaluation Module
ABSTRACT
This document is provided with the MCT8316ZT customer evaluation module (EVM) as a supplement to the
MCT8316Zx data sheet (MCT8316Z Three-Phase Sensored-Trapezoidal BLDC Motor Driver Data Sheet). This
User's Guide details the hardware implementation of the EVM and how to setup and power the board.
Note
The MCT8316ZTEVM comes automatically populated with and configured for the MCT8316Z0T. It is
also compatible for the MCT8316Z0R variant (see MCT8316Z0R Compatibility), but the user will need
to replace the MCT8316Z0T with the MCT8316Z0R for compatibility.
Table of Contents
1 Cautions and Warnings..........................................................................................................................................................3
2 Introduction.............................................................................................................................................................................4
3 Quick Start Guide....................................................................................................................................................................5
4 Hardware and Software Overview.........................................................................................................................................6
4.1 Hardware Connections Overview – MCT8316ZTEVM.......................................................................................................6
4.2 Connection Details............................................................................................................................................................. 6
4.3 MSP430FR2355 Microcontroller........................................................................................................................................ 8
4.4 LED Lights..........................................................................................................................................................................9
4.5 User-Configurable Settings.............................................................................................................................................. 10
4.6 Hardware Variant Settings................................................................................................................................................12
4.7 MCT8316Z0R Compatibility............................................................................................................................................. 13
5 Hardware Setup.................................................................................................................................................................... 15
6 Firmware and GUI Application.............................................................................................................................................16
6.1 Downloading Code Composer Studio and Importing GUI Code...................................................................................... 16
6.2 Using the eZ-FET to Program the MSP430FR2355........................................................................................................ 17
6.3 Importing GUI into GUI Composer................................................................................................................................... 18
6.4 MCT8316ZTEVM GUI......................................................................................................................................................19
7 Schematics............................................................................................................................................................................20
7.1 Main Supply and Pi Filter................................................................................................................................................. 20
7.2 Connectors and Interface.................................................................................................................................................20
7.3 USB to UART................................................................................................................................................................... 21
7.4 MCU Programming and Debug........................................................................................................................................21
7.5 MSP430FR2355 MCU..................................................................................................................................................... 22
7.6 MCT8316ZT 3-Phase Sensored Trapezoidal Integrated Driver.......................................................................................22
7.7 3.3V Buck Regulator........................................................................................................................................................ 23
7.8 Status LEDs..................................................................................................................................................................... 23
7.9 Hardware Variant Settings................................................................................................................................................24
7.10 Switches and PWM Input............................................................................................................................................... 24
8 Revision History................................................................................................................................................................... 24
List of Figures
Figure 2-1. MCT8316ZTEVM Printed Circuit Board (PCB - Top View)........................................................................................4
Figure 3-1. Reference for Quick Start Guide............................................................................................................................... 5
Figure 4-1. MCT8316ZTEVM Major Hardware Blocks................................................................................................................ 6
Figure 4-2. Connections from Motor to MCT8316ZTEVM........................................................................................................... 7
Figure 4-3. Micro-USB Connector and UART for MCT8316ZTEVM............................................................................................8
Figure 4-4. MSP430FR2355 MCU on MCT8316ZTEVM.............................................................................................................9
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Figure 4-5. MCT8316ZTEVM LEDs...........................................................................................................................................10
Figure 4-6. Resistor Divider Settings for MCT8316ZT (Hardware Variant)................................................................................12
Figure 4-7. Resistors for MCT8316Z0R (SPI variant)................................................................................................................14
Figure 6-1. MCT8316ZTEVM GUI Code in Code Composer Studio......................................................................................... 16
Figure 6-2. MSP430 LaunchPad™ eZ-FET Probe Connected to MCT8316ZTEVM .................................................................18
Figure 6-3. MCT8316ZTEVM GUI ............................................................................................................................................ 19
Figure 7-1. Main Supply and Pi Filter Schematic.......................................................................................................................20
Figure 7-2. Connectors and Interface Schematic...................................................................................................................... 20
Figure 7-3. USB to UART Schematic.........................................................................................................................................21
Figure 7-4. MCU Programming and Debug Schematic............................................................................................................. 21
Figure 7-5. MSP430FR2355 MCU Schematic...........................................................................................................................22
Figure 7-6. MCT8316ZT 3-Phase Sensored Trapezoidal Integrated Driver Schematic............................................................ 22
Figure 7-7. 3.3V Buck Regulator Schematic..............................................................................................................................23
Figure 7-8. Status LED Schematics...........................................................................................................................................23
Figure 7-9. Hardware Variant Settings Schematic.....................................................................................................................24
Figure 7-10. Switches and PWM Inputs Schematic...................................................................................................................24
List of Tables
Table 2-1. MCT8316Z variants.................................................................................................................................................... 4
Table 4-1. Description of MCT8316ZTEVM LEDs (default in bold after powerup)...................................................................... 9
Table 4-2. Description of User-Selectable Settings on MCT8316ZTEVM (Default in Bold).......................................................10
Table 4-3. User-Adjustable Resistor Divider Settings for MCT8316ZT Variant (Defaults in Bold)............................................. 13
Table 4-4. Status of resistors for MCT8316Z0T/R variants (defaults in bold)............................................................................ 14
Table 6-1. SPI-by-Wire Connections Needed to Program MSP430FR2355..............................................................................17
Trademarks
LaunchPad™ is a trademark 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.
CAUTION:
!
Read the User's Guide before use.
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 MCT8316Z is a 4.5-V to 35-V, 8-A peak integrated three-phase gate driver IC with sensored
trapezoidal control for motor drive applications. It provides three integrated half-bridges and a sensored
trapezoidal algorithm capable of directly driving a 3-phase brushless-DC motor. The hardware interface variant
(MCT8316ZT) integrates an adjustable buck regulator, protection features, and flexible parameter settings such
as slew rate control and buck output voltage. See Table 3-1.
Table 2-1. MCT8316Z variants
Device Name Variant
MCT8316Z0T Buck regulator and Hardware
MCT8316Z0R Buck regulator and SPI
The MCT8316ZTEVM includes an onboard FTDI chip to convert USB communication from the micro-USB
connector into UART. An onboard MSP430FR2355 MCU translates the UART communication and onboard
potentiometer into control signals and a variable duty cycle for the PWM input of the MCT8316Z. It can also
provide SPI communication for the SPI variant of the MCT8316Z device. There are many user-selectable
jumpers, resistors, connectors, and test points to evaluate the features of the device and configure device-
specific settings.
This document serves as a startup guide to supplement the MCT8316ZTEVM. It is intended for engineers to
design, implement, and validate reference hardware for the MCT8316ZT (H/W variant) along with the device
data sheet.
Figure 2-1. MCT8316ZTEVM Printed Circuit Board (PCB - Top View)
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3 Quick Start Guide
The MCT8316ZTEVM 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, use the following the sequence:
1. Connect motor phases to A, B, and C on connector J13.
2. Connect Hall sensors to J11 and select Hall power supply as 3.3 V from buck or an external Hall supply
on J12. Ensure the MODE resistors are set correctly to use the appropriate Hall sensor configuration as
described in Section 4.6.
a. If using digital Hall inputs, populate J8–J10 with shunt jumpers to enable pullups. Connect the single-
ended inputs to only the HPx pins on connector J11. This is the default of the MCT8316ZTEVM.
b. If using analog Hall inputs, remove J8-J10 and connect differential Hall inputs to HPx and HNx on
connector J11.
3. Ensure resistors are populated in H/W variant resistors for desired hardware settings.
4. Do not turn on the power supply yet. Connect the motor supply to VBAT or 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.
5. Select J3 to 5V_USB and J5 to 3V3COM to power MSP430 from USB power supply.
6. Connect the micro-USB cable into the computer.
7. Turn the potentiometer fully clockwise to set the motor to zero speed upon powerup.
8. Turn on the motor power supply.
9. Use the potentiometer 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 MCT8316ZT into a low-power sleep mode, and read status of the
LEDs.
Figure 3-1. Reference for Quick Start Guide
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4 Hardware and Software Overview
4.1 Hardware Connections Overview – MCT8316ZTEVM
Figure 4-1 shows the major blocks of the MCT8316ZTEVM evaluation module. The MCT8316ZTEVM is
designed for an input supply VBAT from 4.5 V to 36 V. The MCT8316Z includes three integrated half-bridges and
implements a sensored trapezoidal algorithm to spin a motor with up to 8-A peak current. It also integrates an
adjustable buck regulator and can support many types of Hall sensor configurations or be used to power external
circuits.
Figure 4-1. MCT8316ZTEVM Major Hardware Blocks
4.2 Connection Details
Figure 4-2 shows the connections made to the MCT8316ZTEVM to spin a 3-phase sensored brushless-DC
motor.
A 4.5-V to 36-V power supply or battery is connected to the supply voltage (VBAT) or motor voltage (VM)
and PGND terminals on connector J7. There is a reverse-polarity protection and Pi filter implemented on the
VBAT and PGND terminals, resulting in a 0.7-V diode voltage supply drop to VM. To bypass the reverse-polarity
protection and Pi filter, connect the power supply directly 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 J13 provided on the MCT8316ZTEVM.
Use connector J11 on the MCT8316ZTEVM to connect single-ended digital or analog differential Hall inputs. Use
HALL_PWR for Hall power and AGND for Hall ground. If connecting analog inputs from a Hall element, connect
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to the HPx and HNx pins for each respective phase and remove jumpers J8-10. Otherwise, if using single-ended
input from a Hall sensor, connect to only the HPx pins for each phase and populate jumpers R8–R10.
Figure 4-2. Connections from Motor to MCT8316ZTEVM
Figure 4-3 shows where the micro-USB cable is plugged into the MCT8316ZTEVM 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 by the PC 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 MCT8316ZTEVM
4.3 MSP430FR2355 Microcontroller
The MCT8316ZTEVM includes the MSP430FR2355 low-power MCU (as shown in Figure 4-4) to provide the
pulse-width modulation (PWM) signal required to commutate the motor. The MCU outputs a 20-kHz PWM signal
(PWM_MSP), and the duty cycle (ranging from 0–100%) is controlled by the potentiometer R4. The motor speed
will increase the more the potentiometer is turned counterclockwise, and will decrease when turned clockwise.
To select whether the PWM signal from the MSP or an external PWM is sourced to the MCT8316Z, use the
PWM_SEL jumper J1.
To program the MSP430FR2355, an external MSP430 LaunchPad™ must be connected to the four-pin
connector J4. Many MSP430 LaunchPads provide an onboard eZ-FET Debug Probe to flash the program into
the microcontroller and support debug using a 2-pin Spy-by-Wire (SBW).
The user can use the Reset (RST) button at any time to restart the MCU program. Two active-low LEDs, D5 and
D6, can be used for debug purposes as well.
Finally, a shunt jumper bridge on 18-pin connector J6 ties all signals between the microcontroller and the
MCT8316Z device. These jumpers can be inserted or removed as needed to isolate the microcontroller from the
gate driver. This allows for microcontroller signal debugging or using the MCT8316ZTEVM as a standalone gate
driver with an external microcontroller.
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Figure 4-4. MSP430FR2355 MCU on MCT8316ZTEVM
4.4 LED Lights
The MCT8316ZTEVM has 5 status LEDs 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 MCT8316ZTEVM LEDs (default in bold after powerup)
Designator Name Color Description
D1 3.3 V Green Internal buck regulator is outputting 3.3 V
D2 nFAULT Red Lights up when fault condition has occurred on MCT8316Z
D3 VM Green Motor power is supplied to the board
D5 MSP_LED0 Red Used for UART or debugging
D6 MSP_LED1 Red Used for UART or debugging
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Figure 4-5. MCT8316ZTEVM LEDs
4.5 User-Configurable Settings
The MCT8316ZTEVM 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 MCT8316ZTEVM (Default in Bold)
Designator Setting Name Description Layer Position Function
L1, L2, R1 3.3-V Buck Inductor User populates L1, L2, or R1 to
choose switching component for
buck regulator
Top L1 = 47 μH 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)
J1 PWM_SEL Selects PWM source Top J1 = PWM_EXT External PWM
J1 = PWM_MSP PWM from MSP430
J12 HALL_PWR_SEL Selects Hall power source Top J12 = HALL_EXT External Hall power
J12 = 3.3 V Hall power from
VBK = 3.3 V
J8 HPA pullup Enables pullup on Hall positive A
(HPA)
Top J8 is inserted Pullup, use for
Digital Hall inputs
J8 is removed Floating, use for
Analog Hall inputs
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Table 4-2. Description of User-Selectable Settings on MCT8316ZTEVM (Default in Bold) (continued)
Designator Setting Name Description Layer Position Function
J9 HPB pullup Enables pullup on Hall positive B
(HPA)
Top J9 is inserted Pullup, use for
Digital Hall inputs
J9 is removed Floating, use for
Analog Hall inputs
J10 HPC pullup Enables pullup on Hall positive C
(HPC)
Top J10 is inserted Pullup, use for
Digital Hall inputs
J10 is removed Floating, use for
Analog Hall inputs
J6 MSP to MCT Shunt
jumper bridge
Connects signals from MCU to
MCT8316Z when jumpers are
inserted
Top FGOUT MSP_FGOUT
PWM MSP_PWM
STE MSP_STE
SCK MSP_SCK
SIMO MSP_SIMO
SOMI MSP_SOMI
nFAULT MSP_nFAULT
nSLEEP MSP_nSLEEP
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 Clockwise
Right Counterclockwise
S3 DRVOFF Disables gate drivers Top Left MCT8316Z enabled
Right MCT8316Z disabled
R10 and R11 ILIM Resistor divider that sets the cycle-
by-cycle current limit (ILIM voltage
of AVDD to AVDD - 0.4 sets limit
proportionally from 0 to 8 A)
Top 16.2 kΩ (R10) ILIM = 1.25 V = 8-A
limit
10 kΩ (R11)
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4.6 Hardware Variant Settings
The MCT8316ZT device uses the configurable resistors to control the MODE, SLEW, ADVANCE, and
VSEL_BUCK settings.
When using the MCT8316ZT, the SPI enable resistors in the “Depop. if H/W Variant” silk screen box are to be
depopulated (R13–R16) and the resistor dividers in the “H/W Variant Resistors” silk screen box are populated
with the desired settings (R19–R22 and R26–R29). This setup is shown in Figure 4-6.
Figure 4-6. Resistor Divider Settings for MCT8316ZT (Hardware Variant)
Table 4-3 shows the user-adjustable resistor divider settings when using the MCT8316ZT. R19–R22 resistors
connect to AVDD and R26–R29 resistors connect to AGND. The defaults of the two tables are in bold.
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Table 4-3. User-Adjustable Resistor Divider Settings for MCT8316ZT Variant (Defaults in Bold)
Setting Name Description Resistors
(AVDD and
AGND)
Configuration Setting
VSEL_BK VBK Buck regulator average
voltage
(LBK = 47 or 22 μH,
CBK = 22 μF)
R21 and R28 R28 = 0 Ω 3.3 V
R21 = R28 = DNP 5.0 V
R21 = 47 kΩ 4.0 V
R21 = 0 Ω 5.7 V
MODE PWM Control Mode Selects the
Hall configuration,
modulation,
Asynchronous
Rectification (ASR),
and Automatic
Asynchronous
Rectification (AAR)
settings
R22 and R29 R29 = 0 Ω Analog Hall Input, Asynchronous
modulation, ASR and AAR
Disabled
R29 = 22 kΩ Digital Hall Input, Asynchronous
modulation, ASR and AAR
Disabled
R29 = 100 kΩ Analog Hall Input, Synchronous
modulation, ASR and AAR
Disabled
R22 = R29 = DNP Digital Hall Input, Synchronous
modulation, ASR and AAR
Disabled
R22 = 100 kΩ Analog Hall Input, Synchronous
modulation, ASR and AAR
Enabled
R22 = 22 kΩ Digital Hall Input, Synchronous
modulation, ASR and AAR
Enabled
R22 = 0 Ω Digital Hall Input, Asynchronous
modulation, ASR and AAR
Enabled
SLEW Slew Rate Phase pin slew rate
switching low to high
(10-90%) and high to
low (90-10%)
R19 and R26 R26 = 0 Ω 25 V/μs
R19 = R26 = DNP 50 V/μs
R19 = 47 kΩ 125 V/μs
R19 = 0 Ω 200 V/μs
ADV Advance Advances the lead
angle by a selectable
value (in electrical
degrees)
R20 and R27 R27 = 0 Ω 0°
R27 = 22 kΩ 4°
R27 = 100 kΩ 11°
R20 = R27 = DNP 15°
R20 = 100 kΩ 20°
R20 = 22 kΩ 25°
R20 = 0 Ω 30°
4.7 MCT8316Z0R Compatibility
The MCT8316ZTEVM is also compatible with the MCT8316Z0R (SPI variant) as the featured motor driver IC
to spin a three-phase Brushless-DC motor. The MCT8316Z0R replaces the MODE, ADVANCE, SLEW, and
VSEL_BK pins with four SPI pins (SDI, SDO, SCLK, nSCS) to configure control registers and read status
registers. When using the MCT8316Z0R:
• SPI enable resistors in the “Depop. if H/W” silk screen box are to be populated (R13-R16)
• "Pop. If H/W" resistor (R17) is to be depopulated
• Resistor dividers in the “Hardware Variant Resistors” silk screen box are to be depopulated (R19-R22,
R26-R29).
Table 4-4 and Figure 4-7 show the status of populated and DNP resistors for the two compatible MCT8316Zx
variants.
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Table 4-4. Status of resistors for MCT8316Z0T/R variants (defaults in bold)
Device Variant R13-R16 status R17 status H/W variant resistors
status
MCT8316Z0T Hardware DNP Populated User Adjustable
MCT8316Z0R SPI Populated DNP DNP
Figure 4-7. Resistors for MCT8316Z0R (SPI variant)
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5 Hardware Setup
The hardware required to run the motor is the MCT8316ZTEVM, a micro-USB cable, and a power supply with a
DC output from 8 V to 32 V. Follow these steps to start up the MCT8316ZTEVM:
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. Populate the desired resistor settings to the “H/W Variant Resistors” box, see Table 4-3.
3. Apply user-configurable jumper settings. See the User-Configurable Settings section for more information.
4. Flash the program into the MCU as described in Section 6. Launch the GUI in GUI Composer and
disconnect the 4-pin JTAG connections.
5. Connect a micro-USB cable to the MCT8316ZTEVM and computer.
6. Turn on the power supply and power up the PCB.
If using the MCT8316ZTEVM 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 Firmware and GUI Application
The MCT8316ZTEVM implements an internal sensored trapezoidal control algorithm that requires a PWM signal
with variable duty cycle to control the speed of the motor. It also outputs an FGOUT signal to monitor the speed
of the motor. Finally, the evaluation module includes a backchannel USB-UART interface that communicates to a
host PC to monitor the motor real time and configure settings via SPI for the SPI variant of the device.
The MCT8316ZTEVM GUI is available on the Gallery. This GUI monitors the duty cycle of the 20-kHz PWM
waveform to control motor speed, the motor speed in revolutions per minute (RPM) based on the motor poles,
and controls the nSLEEP signal.
By default, the MSP430 should already contain the user code to run the GUI. If there is a FW update or the GUI
does not connect to the EVM, then the user must flash the code onto the MSP430.
To flash user code, you need an external MSP430 LaunchPad that includes the eZ-FET Debug Probe and Code
Composer Studio (CCS). This example uses the MSP-EXP430FR2355 LaunchPad Development Kit to provide
the debug probe. Use the following steps to download the code for the MCT8316ZTEVM to use with the GUI.
6.1 Downloading Code Composer Studio and Importing GUI Code
1. Extract the “MCT8316ZTEVM_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 select “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 “MCT8316ZTEVM_MSP430FR2355_Firmware_GUI” folder installed from step 1.
6. Import the project “MCT8316ZTEVM_MSP430FR2355_Firmware_GUI” into your workspace as shown in
Figure 6-1.
Figure 6-1. MCT8316ZTEVM GUI Code in Code Composer Studio
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6.2 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 MCT8316ZTEVM. 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 MCT8316ZTEVM as shown in Table 6-1 and Figure 6-2.
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 6-1. SPI-by-Wire Connections Needed to Program MSP430FR2355
MSP430 LaunchPad™ (eZ-FET Debug Probe Side) (J101) MCT8316ZTEVM 4-pin SPI-by-Wire Header (J4)
GND GND
3V3 3.3V
SBWTDIO SBWTDIO
SBWTCK SBWTCK
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Figure 6-2. MSP430 LaunchPad™ eZ-FET Probe Connected to MCT8316ZTEVM
6.3 Importing GUI into GUI Composer
1. Connect the MCT8316ZTEVM as described in Section 5.
2. Access the MCT8316ZEVM GUI through the Gallery.
3. Once the project is loaded, click on the Play button () to launch the MCT8316ZTEVM GUI as shown in
Figure 6-3.
Firmware and GUI Application www.ti.com
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Figure 6-3. MCT8316ZTEVM GUI
6.4 MCT8316ZTEVM GUI
The following features are enabled in the MCT8316ZTEVM GUI:
PWM or Duty Cycle Settings
• Use the potentiometer on the MCT8316ZTEVM to control the duty cycle of the 20-kHz PWM waveform from
the MSP430FR2355. The slider and gauge will update real-time with the duty cycle from 0–100%.
Motor Settings and Calculations
• Update the number of motor poles in the motor using the “Motor Pole Pairs (#)” drop-down box.
• The FGOUT frequency is measured and updated real time in the FGOUT Freq (Hz) box.
• The FGOUT frequency and number of motor poles are used to calculate and update the Motor Speed (RPM)
box. The speed is calculated by the Motor Speed Calculation from FGOUT and Pole Pairs formula below.
Note that the FGOUT frequency is multiplied by 3 to achieve the frequency of one electrical cycle, in Hz.
MotorSpeedRPM =60×FGOUT × 3
# MotorPolePairs (1)
Status LEDs and nSLEEP Control
• The statuses of the programmable MCU LEDs are shown by LED1 and LED2.
• To place the MCT8316Z into a low-power sleep mode, click the nSLEEP button into the right position. The
MSP430 sends an active-low signal to nSLEEP on the device.
www.ti.com Firmware and GUI Application
SNLU291B – MARCH 2021 – REVISED AUGUST 2022
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MCT8316ZTEVM Evaluation Module 19
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7 Schematics
Figure 7-1 through Figure 7-10 illustrate the EVM schematics.
7.1 Main Supply and Pi Filter
Figure 7-1. Main Supply and Pi Filter Schematic
7.2 Connectors and Interface
Figure 7-2. Connectors and Interface Schematic
Schematics www.ti.com
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