Texas Instruments MCF8315EVM User manual

User’s Guide
MCF8315EVM Evaluation Module
ABSTRACT
This document is provided with the MCF8315 customer evaluation module (EVM) as a supplement to the
MCF8315 data sheet (MCF8315A Three-Phase Sensorless-FOC 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 – MCF8315EVM........................................................................................................... 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 MCF8315 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 MCF8315 3-Phase Sensorless FOC 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™ 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.
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 MCF8315 is a 4.5-V to 35-V, 5-A peak integrated three-phase gate driver IC with sensorless field-oriented
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 (MCF8315) also provides a standard I2C interface for
configuring the various device settings and reading fault diagnostic information through an external controller.
The MCF8315EVM 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 MCF8315. It can also provide
SPI communication for the SPI variant of the MCF8315 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 MCF8315EVM. It is intended for engineers to
design, implement, and validate reference hardware for the MCF8315 device.
Figure 2-1. MCF8315EVM Printed Circuit Board (PCB - Top View)
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3 Quick Start Guide
The MCF8315EVM 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 MCF8315A GUI
Application) to monitor real-time speed of the motor, put the MCF8315 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 – MCF8315EVM
Figure 4-1 shows the major blocks of MCF8315EVM evaluation module. The MCF8315EVM is designed for
an input supply from 4.5-V to 35-V. The MCF8315 includes three integrated half-bridges and implements a
sensorless FOC algorithm to spin a motor with up to 5-A peak current. It also integrates an adjustable buck
regulator.
Figure 4-1. MCF8315EVM Major Hardware Blocks
4.2 Connection Details
Figure 4-2 shows the connections made to the MCF8315EVM 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 MCF8315EVM.
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Figure 4-2. Connections from Motor to MCF8315EVM
Figure 4-3 shows where the micro-USB cable is plugged into the MCF8315EVM 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 MCF8315EVM
4.3 MSP430FR2355 Microcontroller & User Interface
The MCF8315EVM includes the MSP430FR2355 low-power MCU (as shown in Figure 4-4) to communicates via
I2C with the MCF8315.
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 MCF8315EVM 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
MCF8315. 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 MCF8315EVM as a standalone gate
driver with an external microcontroller.
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Figure 4-4. MSP430FR2355 MCU and User Interface on MCF8315EVM
4.4 LED Lights
The MCF8315EVM has 6 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 MCF8315EVM 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 MCF8315
D3 ALARM Red Lights up when alarm condition has occurred on MCF8315
D4 VM Green Motor power is supplied to the board
D6 MSP_LED1 Red Used for UART or debugging
D7 MSP_LED2 Green Used for UART or debugging
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Figure 4-5. MCF8315EVM LEDs
4.5 User-Configurable Settings
The MCF8315EVM 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 MCF8315EVM (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 R9 = 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 MCF8315EVM (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 = PWM On-board PWM from
MSP430
J6 MSP to MCx Shunt
jumper bridge
Connects signals from MCU and user
switches to MCx8315 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 DACOUT2
MSP_A1 DACOUT1
MSP_ALARM ALARM
MSP_nFAULT nFAULT
MSP_FG FG
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 MCF8315 FETs
disabled
Right MCF8315 FETs
enabled
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5 Hardware Setup
The hardware required to run the motor is the MCF8315EVM, 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 MCF8315EVM:
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. 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 MCF8315EVM and computer.
5. Turn on the power supply and power up the PCB.
If using the MCF8315EVM 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 MCF8315 GUI Application
The MCF8315EVM includes a USB-UART interface, using a MSP430FR2355 microcontroller, that serves as a
communication bridge between a host PC and the MCF8315 device for configuring various device settings and
reading fault diagnostic information. A MCF8315A GUI is available to interface with and configure the MCF8315
using this communication interface.
Access the MCF8315A GUI through the TI Cloud Gallery.
6.1 Running the GUI
The MCF8315A GUI can be run directly inside a web browser (supported in Google Chrome and Firefox).
Figure 6-1. MCF8315A 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 MCF8315A GUI can be downloaded and installed offline using the download feature in the TI
Cloud Gallery.
MCF8315 GUI Application www.ti.com
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Figure 6-2. MCF8315A GUI Offline Installer
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7 MSP430FR2355 Interface Firmware
The MSP430FR2355 on the MCF8315EVM comes pre-programmed with the firmware necessary for
communicating with the PC GUI and the MCF8315. 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 MCF8315EVM to use with the GUI.
7.1 Downloading Code Composer Studio and Importing MSP430FR2355 Interface Firmware
Code
1. Download and extract the “MCx8315EVM_MSP430FR2355_Firmware.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 “MCx8315EVM_MSP430FR2355_Firmware” folder installed from step 1.
6. Import the project “MCx8315EVM_MSP430FR2355_Firmware” 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 MCF8315EVM. 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 MCF8315EVM as shown in Table 7-1 and Figure 7-2.
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.
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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) MCF8315EVM 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 MCF8315EVM
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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 MCF8315 3-Phase Sensorless FOC Integrated Driver
Figure 8-6. MCF8315 3-Phase Sensorless FOC 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
9 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
DATE REVISION NOTES
December 2022 * Initial Release
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