Texas Instruments MCT8329EVM User manual

User's Guide
MCT8329EVM Evaluation Module
ABSTRACT
This document is provided with the MCT8329 customer evaluation module (EVM) as a supplement to the
MCT8329 data sheet (MCT8329 Three-Phase Sensorless-Trapezoidal BLDC Gate 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.............................................................................................................................................................................2
3 Quick Start Guide....................................................................................................................................................................3
4 Hardware and Software Overview.........................................................................................................................................4
4.1 Hardware Connections Overview – MCT8329EVM........................................................................................................... 4
4.2 Connection Details............................................................................................................................................................. 5
4.3 MSP430FR2355 Microcontroller & User Interface............................................................................................................. 6
4.4 LED Lights..........................................................................................................................................................................7
4.5 User-Configurable Settings................................................................................................................................................ 8
5 Hardware Setup.................................................................................................................................................................... 10
6 MCT8329 GUI Application.................................................................................................................................................... 11
6.1 Running the GUI...............................................................................................................................................................11
6.2 Offline Installer..................................................................................................................................................................11
7 MSP430FR2355 Interface Firmware.................................................................................................................................... 12
7.1 Downloading Code Composer Studio and Importing MSP430FR2355 Interface Firmware Code...................................12
7.2 Using the eZ-FET to Program the MSP430FR2355........................................................................................................ 13
8 Schematics............................................................................................................................................................................14
8.1 Main Supply..................................................................................................................................................................... 14
8.2 Connectors and Interface.................................................................................................................................................14
8.3 USB to UART................................................................................................................................................................... 14
8.4 MCU Programming and Debug........................................................................................................................................15
8.5 MSP430FR2355 MCU..................................................................................................................................................... 15
8.6 MCT8329 3-Phase Sensorless Trapezoidal Gate Driver................................................................................................. 16
8.7 Status LEDs..................................................................................................................................................................... 16
8.8 Switches and Speed Input............................................................................................................................................... 17
9 Revision History................................................................................................................................................................... 18
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
Hot Surface! Contact can cause burns. Do not
touch. Please take the proper precautions when
operating.
2 Introduction
The MCT8329 is a 4.5-V to 60-V, three-phase BLDC gate driver IC with code-free sensorless Trapezoidal control
for motor drive applications. The MCT8329 provides three half-bridge gate drivers, each capable of driving
highside and low-side N-channel power MOSFETs. The device generates the correct gate drive voltages using
in internal charge pump and enhances the high-side MOSFETs using a bootstrap circuit. A trickle charge pump
is included to support 100% duty cycle. The Gate Drive architecture supports peak gate drive currents up to
1-A source and 2-A sink. The MCT8329 can operate from a single power supply and supports a wide input
supply range of 4.5 to 60 V. The I2C interface variant (MCT8329A1I) also provides a standard I2C interface for
configuring the various device settings and reading fault diagnostic information through an external controller.
The MCT8329EVM 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 MCT8329. The MCT8329EVM
can also provide SPI communication for the SPI variant of the MCT8329 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 MCT8329EVM. The user's guide is intended for
engineers to design, implement, and validate reference hardware for the MCT8329 device.
Figure 2-1. MCT8329EVM Printed Circuit Board (PCB - Top View)
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3 Quick Start Guide
The MCT8329EVM requires a power supply source, which has a recommended operating range from a 4.5-V to
60-V. To setup and power the EVM, follow the sequence below:
1. Connect motor phases to A, B, C on connector J11.
2. Do not turn on the power supply yet. Connect motor supply to PVDD and GND on connector J10.
3. Select J6 to 5V_USB and J8 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 top to configure BRAKE = RUN, switch S2 to the top to configure DRVOFF = ON,
switch S3 to the bottom to configure DIR = ABC, and switch S4 to the bottom to configure to WAKE.
7. Flip the switch SW1 to left to configure SPEED/WAKE pin to SPEED mode and DACOUT/SOx/SPEED_ANA
pin to DACOUT mode. Note that flipping the switch SW1 to right configures SPEED/WAKE pin to WAKE
mode and DACOUT/SOx/SPEED_ANA pin to SPEED_ANA mode. When SW1 is flipped to right, switch S4
can be used to put the device in SLEEP or WAKE mode and potentiometer R47 can be used to apply analog
voltage to the DACOUT/SOx/SPEED_ANA pin.
8. Select J12 to leftmost position(closer to C6) to apply AVDD to VREG.
9. Select J13 to middle position to apply analog voltage from potentiometer R47 to SPEED/WAKE pin.
10. Turn on the motor power supply.
11. Use the potentiometer R47 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 MCT8329 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 – MCT8329EVM
Figure 4-1 shows the major blocks of MCT8329EVM evaluation module. The MCT8329EVM is designed for an
input supply from 4.5-V to 60-V. The MCT8329EVM includes power stage with six external N-channel power
MOSFETs (Part number: CSD18536KTTT) and passive components. The MCT8329EVM also includes a current
sense shunt resistor of 1 mΩ and an external N-channel MOSFET controlled by GCTRL to generate VREG.
Figure 4-1. MCT8329EVM Major Hardware Blocks
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4.2 Connection Details
Figure 4-2 shows the connections made to the MCT8329EVM to spin a 3-phase sensorless Brushless-DC motor.
An 4.5-V to 60-V power supply is connected to the PVDD and GND terminals on connector J10.
The three phases of the BLDC motor connect directly to the A, B, and C terminals of the screw terminal
connector J11 provided on the MCT8329EVM.
Figure 4-2. Connections from Motor to MCT8329EVM
Figure 4-3 MSP430FR2355 Microcontrollershows where the micro-USB cable is plugged into the MCT8329EVM
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 wants to supply more
current to these rails, then 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 MCT8329EVM
4.3 MSP430FR2355 Microcontroller & User Interface
The MCT8329EVM includes the MSP430FR2355 low-power MCU (as shown in Figure 4-4) to communicates via
I2C with the MCT8329.
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 MCT8329EVM 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, D13 and D14, can be used for debug purposes as well.
Finally, a shunt jumper bridge on the 32-pin connector J9 ties all signals between the microcontroller and
MCT8329. 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 MCT8329EVM as a standalone gate driver
with an external microcontroller.
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Figure 4-4. MSP430FR2355 MCU and User Interface on MCT8329EVM
4.4 LED Lights
The MCT8329EVM has 5 status LEDs implemented that provide the status of power supplies and functions of
the evaluation module. By default, the VM LED and 3.3 V Buck LEDs 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 MCT8329EVM LEDs (default in bold after powerup)
Designator Name Color Description
D1 AVDD Regulator Green Lights up when AVDD is turned ON.
D2 nFAULT Red Lights up when fault condition has occurred on MCT8329
D3 PVDD Green Lights up when voltage is applied on PVDD.
D13 MSP_LED1 Red Used for UART or debugging
D14 MSP_LED2 Red Used for UART or debugging
Figure 4-5. MCT8329EVM LEDs
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4.5 User-Configurable Settings
The MCT8329EVM 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 MCT8329EVM (Default in Bold)
Designator Setting Name Description Layer Position Function
J8 3V3_SEL Select 3.3 V for MCU power Top J8 = 3V3EXT External
J8 = 3V3COM From FTDI (30 mA)
J6 5V_SEL Select 5 V for FTDI power Top J6 = 5V_EXT External
J6 = 5V_USB From USB power
(500 mA)
J13 SPEED_SEL Selects SPEED input source Top J13 = EXT External
EXT_SPEED test
point
J13 = POT From
Potentiometer R47.
J13 =
INT_PWM
From internal PWM.
PWM Duty cycle can
be varied by rotating
the POT R47.
J9 MSP to MCx Shunt
jumper bridge
Connects signals from MCU and user
switches to MCT8329 when jumpers
are inserted
Top DRVOFF_SW DRVOFF
DIR_SW DIR
BRAKE_SW BRAKE
SPEED_WAKE SPEED/WAKE
MSP_POCI/SCL SCL
MSP_PICO/SDA SDA
MSP_CLK NC
MSP_STE NC
DAC/SPEED DAC/SPEED
MSP_A2 NC
MSP_A1 GCTRL
NC NC
MSP_nFAULT nFAULT
MSP_FGOUT FGOUT
NC NC
GND GND
J12 VREG_SEL Selects VREG power supply Top Left position VREG powered by
AVDD
Middle position VREG powered
externally.
Right position VREG powered by
MOSFET Q7
J1 AVDD LED Connects AVDD LED to 3.3 V pull
up.
Top Connected D1 lights up when
AVDD is turned ON.
J2 nFAULT LED Connects nFAULT LED to 3.3 V pull
up.
Top Connected D2 lights up when
nFAULT is
Pulled low.
J3 PVDD LED Connects PVDD LED to 3.3 V pull
up.
Top Connected D3 lights up when
voltage is applied
to PVDD.
S1 BRAKE Turns on all low-side MOSFETs Top Bottom Brake enabled
Top Brake disabled
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Table 4-2. Description of User-Selectable Settings on MCT8329EVM (Default in Bold) (continued)
Designator Setting Name Description Layer Position Function
S2 DRVOFF Disables gate drivers Top Bottom MCT8329 disabled
Top MCT8329 enabled
S3 DIR Controls direction of motor rotation. Top Bottom ABC
Top ACB
S4 SPEED/WAKE Pulls SPEED/WAKE pin to AVDD
and GND
Top Bottom SPEED/WAKE pin
pulled to AVDD.
Top SPEED/WAKE pin
pulled to GND.
SW1 N/A Configure SPEED/WAKE pin to
SPEED mode and DACOUT/SOx/
SPEED_ANA pin
Top Left Configure SPEED/
WAKE pin to
SPEED mode
and DACOUT/SOx/
SPEED_ANA pin to
DACOUT mode.
Right Configure SPEED/
WAKE pin to
WAKE mode
and DACOUT/SOx/
SPEED_ANA pin to
SPEED_ANA mode.
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5 Hardware Setup
The hardware required to run the motor is the MCT8329EVM, a Micro-USB cable, and a power supply with a DC
output from 4.5-V to 60-V. Follow these steps to start up the MCT8329EVM:
1. Connect the DC power supply to header J10. Connect to PVDD and GND.
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 MCT8329EVM and computer.
5. Turn on the power supply and power up the PCB.
If using the MCT8329EVM with an external microcontroller, remove all shunt jumpers from jumper bridge J9.
Connect with external jumpers to the left side of the jumper bridge from the external MCU.
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