Texas Instruments MCT8314Z Manual de usuario

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)

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MCT8314Z Evaluation Module 1

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

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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

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MCT8314Z Evaluation Module 3

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

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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

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MCT8314Z Evaluation Module 5

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

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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

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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

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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

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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.

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