Texas Instruments MCT8314Z User manual

EVM User's Guide: MCT8314ZEVM
MCT8314Z Evaluation Module
Description
The MCT8314ZEVM allows users to evaluate the
performance of the MCT8314Z motor driver. The
EVM 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
potentiometers into control signals and a variable
duty cycle for the PWM input of the MCT8314Z. The
MCU can also provide SPI communication for the SPI
variant of the MCT8314Z device. There are many
user-selectable jumpers, resistors, connectors, and
test points to assist with evaluating the many features
of the MCT8314Z device and the configurable device-
specific settings.
Get Started
1. Order the MCT8314ZEVM on ti.com.
2. Visit dev.ti.com/gallery to download the GUI
software or access the web hosted GUI software.
3. Download the latest firmware for the
MCT8314ZEVM on ti.com.
Features
• GUI software with full configuration & control
capability.
• MCU-to-MCx shunt jumper header with removable
shunts to disconnect main signals going to the
motor driver IC from the MCU. The shunts can
be removed if the user desires to control the
MCT8314Z IC with an external MCU or to use the
EVM MCU to control an external MCT8314Z IC.
Applications
•Vacuum robots
• Motorized blinds
•IP cameras
MCT8314ZEVM Printed Circuit Board (PCB - Top View)
www.ti.com Description
SNLU341 – DECEMBER 2023
Submit Document Feedback
MCT8314Z Evaluation Module 1
Copyright © 2023 Texas Instruments Incorporated

1 Evaluation Module Overview
1.1 Introduction
This document is provided with the MCT8314Z evaluation module (EVM) as a supplement to the MCT8314Z
data sheet. This user's guide details the hardware setup instructions, GUI installation, and usage instructions.
CAUTION
Hot surface temperature
The EVM can have high surface temperatures marked by the FIRE triangular symbol on the EVM.
Avoid touching the marked hot surface are when driving high currents to prevent potential burn
damage.
Note
The MCT8314ZEVM comes automatically populated with and configured for the MCT8314ZH. For
compatibility with the MCT8314ZS see Section 2.7.2.
1.2 Kit Contents
Table 1-1 lists the contents of the EVM kit. Contact the Texas Instruments Product Information Center nearest to
you if any components are missing. TI highly recommends that users check the TI website at https://www.ti.com
to verify that the latest version of the related software is being used.
Table 1-1. Kit Contents
Item Quantity
MCT8314ZEVM 1
USB A Male-to-USB B micro male cable 1
1.3 Specification
The MCT8314ZEVM is rated for operation of 40 V absolute maximum and up to 1.5 A peak. To prevent damage
to the MCT8314Z IC and EVM, confirm that the voltage and current specifications are not exceeded.
1.4 Device Information
The MCT8314Z is a 4.5 V to 35 V, 1.5 A peak three-phase gate driver IC with sensored trapezoidal control
for motor drive applications. The MCT8314Z provides three integrated half-bridges and a sensored trapezoidal
control in a fixed-function state machine capable of directly driving a 3-phase brushless-DC motor without a
microcontroller.
The MCT8314Z integrates a current sensing feature eliminating the need for external sense resistors, an LDO
for powering external circuits, three analog hall comparators, and many protection features.
Table 1-2. MCT8314Z Variants
Device Name Variant
MCT8314ZH Hardware
MCT8314ZS SPI
Evaluation Module Overview www.ti.com
2MCT8314Z Evaluation Module SNLU341 – DECEMBER 2023
Submit Document Feedback
Copyright © 2023 Texas Instruments Incorporated

2 Hardware
2.1 Quick Start Guide
The MCT8314ZEVM requires a power supply source, which has a recommended operating range from 4.5 V to
35 V. To setup and power the EVM, follow the sequence below:
1. Connect motor phases to A, B, and C on connector J12.
2. Connect Hall sensors to J11 and select Hall power supply to come from AVDD or an external Hall supply
using J13.
a. If using digital Hall inputs, then 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 configuration of the
MCT8314ZEVM.
b. If using analog Hall inputs, then remove J8-J10 and connect differential Hall inputs to HPx and HNx on
connector J11.
3. Populate the R15 Resistor to set the desired setting for the CBC Current limit as described in User
Selectable Settings.
4. If using the MCT8314ZH, then make sure resistors are populated in HW variant resistors for desired device
settings as described in Section 2.7.1.
5. Do not turn on the power supply yet. Connect the motor supply to VBAT or VM and PGND on connector J7.
a. To enable the reverse polarity protection and Pi filter, connect to VBAT. Note, that when connecting to
VBAT, VM is VM – 0.7 V less due to a diode drop in the reverse-polarity protection circuit.
b. To disable the reverse-polarity protection and the Pi filter, connect to VM.
6. Select J3 to 5V_USB and J5 to 3V3COM to power MSP430 from USB power supply.
7. Connect the micro-USB cable into the computer.
8. Turn the R6 potentiometer fully clockwise to set the motor to zero speed upon power up.
9. Flip the switch S1 to the right to configure BRAKE = RUN and switch S2 to the left to configure DIR = ABC.
10. Turn on the motor power supply.
11. Use the R6 potentiometer to control the speed of the motor, the R9 potentiometer to control the cycle-by-
cycle current limit, and the switches to disable the motor driver, change the motor's direction, or brake the
motor. Optionally, use the MCF8314Z GUI, refer to Section 3.1, to monitor the real-time speed of the motor,
put the MCT8314Z into a low-power sleep mode, and read status of the EVMs LEDs.
Figure 2-1. Reference for Quick Start Guide
www.ti.com Hardware
SNLU341 – DECEMBER 2023
Submit Document Feedback
MCT8314Z Evaluation Module 3
Copyright © 2023 Texas Instruments Incorporated

2.2 Hardware Setup
The hardware required to run a motor is the MCT8314ZEVM, 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 MCT8314ZEVM:
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. If using the MCT8314ZH, populate the desired resistor settings in the “HW Variant Resistors” silk screen
box, see Table 2-3. If using the MCT8314ZS populate the resistors R10-R13 in the "Pop. if SPI" silk screen
box.
3. Apply user-configurable jumper settings. See the Section 2.7 section for more information.
4. Flash the program into the MCU as described in Section 3.1. Launch the GUI in GUI Composer and
disconnect the 4-pin JTAG connections.
5. Connect a micro-USB cable to the MCT8314ZEVM and computer.
6. Turn on the power supply and power up the PCB.
If using the MCT8314ZEVM 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.
2.3 Hardware Connections Overview
Figure 2-2 shows the major blocks of the MCT8314ZEVM. The MCT8314ZEVM is designed for an input supply
from 4.5 V to 35 V and offers reverse-polarity protection and a Pi filter. The MCT8314ZEVM can support all
variants of the MCT8314Z device with locations for Hardware resistors and SPI resistors. Through the use of
configurable shunts the MCT8314ZEVM can support many types of Hall sensor configurations. For interfacing
with the MCT8314Z GUI the MCT8314ZEVM has a FTDI chip to support USB-to-UART and a MSP430.
Figure 2-2. MCT8314ZEVM Major Hardware Blocks
Hardware www.ti.com
4MCT8314Z Evaluation Module SNLU341 – DECEMBER 2023
Submit Document Feedback
Copyright © 2023 Texas Instruments Incorporated

2.4 Connection Details
Figure 2-3 shows the connections made to the MCT8315ZEVM to spin a 3-phase sensored brushless-DC motor.
A 4.5-V to 35-V power supply or battery is connected to 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, 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 J12 on the MCT8314ZEVM.
Use connector J11 on the MCT8314ZEVM to connect single-ended digital or analog differential Hall inputs. Use
HPWR for Hall power and AGND for Hall ground. If connecting analog inputs from a Hall element, connect 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 J8-J10.
Figure 2-3. Connections from Motor to MCT8314ZEVM
www.ti.com Hardware
SNLU341 – DECEMBER 2023
Submit Document Feedback
MCT8314Z Evaluation Module 5
Copyright © 2023 Texas Instruments Incorporated

Figure 2-4 shows where the micro-USB cable is plugged into the MCT8314ZEVM to provide communication
between evaluation module and GUI. The USB data and 5-V power from the USB is converted, by the FTDI
chip, into UART data and 3.3-V power, which is used 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 limited to 30 mA. If the user wishes
to supply more current to these rails, then the user can use the 5V_SEL jumper J3 and 3V3_SEL jumper J5 to
connect external power rails.
Figure 2-4. Micro-USB Connector and UART for MCT8314ZEVM
Hardware www.ti.com
6MCT8314Z Evaluation Module SNLU341 – DECEMBER 2023
Submit Document Feedback
Copyright © 2023 Texas Instruments Incorporated

2.5 MSP430FR2355 Microcontroller
The MCT8314ZEVM includes a MSP430FR2355 low-power MCU, shown in Figure 2-5, 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 R6. The motor
speed increases the more the potentiometer is turned counterclockwise, and decreases when turned clockwise.
To select whether the PWM signal from the MSP or an external PWM is sourced to the MCT8314Z, use the
PWM_SEL jumper J1.
To program the MSP430FR2355, an external MSP430 FET programmer must be connected to the Spy-Bi-Wire
(SBW) interface connector J4. Many MSP430 LaunchPads™ provide an onboard eZ-FET Debug Probe that can
be jumper-wired to the MCT8314ZEVM to flash the firmware into the MSP430FR2355 microcontroller.
The user can use the Reset (RST) button at any time to restart the MCU program. Two active-low LEDs, D4 and
D5, can be used for debug purposes as well.
The 18-pin shunt jumper bridge J6 ties all signals between the microcontroller and the MCT8314Z 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 MCT8314ZEVM as a standalone gate driver with an external
microcontroller.
Figure 2-5. MSP430FR2355 MCU on MCT8314ZEVM
www.ti.com Hardware
SNLU341 – DECEMBER 2023
Submit Document Feedback
MCT8314Z Evaluation Module 7
Copyright © 2023 Texas Instruments Incorporated

2.6 LED Lights
The MCT8314ZEVM has 4 status LEDs that provide the status of power supplies and functions of the evaluation
module. By default, the VM LED lights up when the board is powered and the firmware has been flashed onto
the microcontroller. Table 2-1 shows LED descriptions including those that are on during power up in bold and
Figure 2-6 shows the locations of the LEDs.
Table 2-1. Description of MCT8314ZEVM LEDs (Default in Bold After Power Up)
Designator Name Color Description
D1 nFAULT Red Lights up when fault condition has occurred on MCT8314Z.
D2 VM Green Motor power is supplied to the board.
D4 MSP_LED0 Red Used for UART or debugging.
D5 MSP_LED1 Green Used for UART or debugging.
Figure 2-6. MCT8314ZEVM LEDs
Hardware www.ti.com
8MCT8314Z Evaluation Module SNLU341 – DECEMBER 2023
Submit Document Feedback
Copyright © 2023 Texas Instruments Incorporated

2.7 User-Configurable Settings
The MCT8314ZEVM includes a variety of user-selectable jumpers, switches, and resistors on the entirety of the
evaluation board to configure settings. Table 2-2 summarizes all of these configurable settings.
Table 2-2. Description of User-Selectable Settings on MCT8314ZEVM (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 PWM_SEL Selects PWM source Top J1 = PWM_EXT External PWM
J1 = PWM_MSP PWM from MSP430
J13 HALL_PWR_SEL Selects Hall power source
Top J12 = HALL_EXT External Hall power
J12 = AVDD Hall power from AVDD
= 5 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
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
MCT8314Z when jumpers are
inserted
Top FGOUT MSP_FGOUT
PWM MSP_PWM
STE MSP_STE
SCK MSP_SCK
PICO MSP_PICO
POCI MSP_POCI
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 ABC
Right ACB
R15 ILIM
Pull down Resistor that sets the
cycle-by-cycle current limit. The
current limit can be calculated
using the equation 9000 / R15 =
cycle-by-cycle current limit.
Top
6.2 kΩ ILIM = 1.25 V = 1.45 A
limit
www.ti.com Hardware
SNLU341 – DECEMBER 2023
Submit Document Feedback
MCT8314Z Evaluation Module 9
Copyright © 2023 Texas Instruments Incorporated

2.7.1 Hardware Variant Settings
The MCT8314ZH devices uses configurable resistor dividers to control the MODE, ADVANCE, FGOUT, and
LOKC_DET_TIME settings. When using the MCT8314ZH:
• SPI enable resistors in the Pop. if SPI silk screen box needs to be depopulated (R10–R13).
• DIR resistor R14 in the Pop. if HW silk screen box needs be populated with a 0 Ω resistor.
• The resistor dividers in the HW Variant Resistors silk screen box needs be populated according to the desired
settings (R16–R18 and R21–R23).
This setup is shown in Figure 2-7.
Figure 2-7. Resistor Divider Settings for MCT8314ZH (Hardware Variant)
Table 2-3 shows the user-adjustable resistor divider settings when using the MCT8314ZH. R16–R18 resistors
connect to AVDD and R21–R23 resistors connect to AGND. The default resistor divider configurations are in
bold.
Hardware www.ti.com
10 MCT8314Z Evaluation Module SNLU341 – DECEMBER 2023
Submit Document Feedback
Copyright © 2023 Texas Instruments Incorporated