Texas Instruments MCT8315Z User manual

EVM User's Guide: MCT8315ZEVM
MCT8315Z Evaluation Module
Description
The MCT8315ZEVM allows users to evaluate the
performance of the MCT8315Z 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 MCT8315Z. The
MCU can also provide SPI communication for the SPI
variant of the MCT8315Z device. There are many
user-selectable jumpers, resistors, connectors, and
test points to assist with evaluating the many features
of the MCT8315Z device and the configurable device-
specific settings.
Get Started
1. Download the latest design files from the
MCT8315ZEVM tool page on ti.com.
2. Download or use the cloud hosted MCT8315Z
GUI on dev.ti.com.
3. Download the latest firmware for the
MCT8315ZEVM 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 wants to
control the MCT8315Z IC with an external MCU
or to use the EVM MCU to control an external
MCT8315Z IC.
Applications
•Brushless-DC (BLDC) Motor modules
•CPAP machines
•Printers
•Robotic vacuums
•Small home appliances
•Office automation machines
•Factory automation and robotics
MCT8315ZEVM Printed Circuit Board (PCB - Top View)
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1 Evaluation Module Overview
1.1 Introduction
The MCT8315ZEVM comes automatically populated with and configured for the MCT8315ZH. The EVM is also
compatible with the MCT8315ZR and MCT8315ZT variants, see Section 2.7.1 for MCT8315ZT compatibility and
Section 2.7.2 for MCT8315ZR compatibility.
This document is provided with the MCT8315Z evaluation module (EVM) as a supplement to the MCT8315Z
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.
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
MCT8315ZEVM 1
USB A Male-to-USB B micro male cable 1
1.3 Specification
The MCT8315ZEVM is rated for operation of 35 V maximum and up to 4 A peak. To prevent damage to the
MCT8315Z IC and EVM, confirm that the voltage and current specifications are not exceeded.
1.4 Device Information
The MCT8315Z is a 4.5 V to 35 V, 4 A peak three-phase gate driver IC with sensored trapezoidal control
for motor drive applications. The MCT8315Z 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 MCT8315Z integrates a current sensing feature, which eliminates the need for external sense resistors,
an LDO for powering external circuits, three analog hall comparators, and many protection features. The
MCT8315ZH and MCT8315ZR variants include an integrated output adjustable buck for powering external
circuits.
Table 1-2. MCT8315Z Variants
Device Name Variant
MCT8315ZH Buck regulator and Hardware
MCT8315ZR Buck regulator and SPI
MCT8315ZT Hardware
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2 Hardware
2.1 Quick Startup Guide
The MCT8315ZEVM 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 J8.
2. Connect Hall sensors to J12 and select Hall power supply to come from VBK or an external Hall supply
using J13.
a. If using digital Hall inputs, then populate J9–J11 with shunt jumpers to enable pullups. Connect the
single-ended inputs to only the HPx pins on connector J12. This is the default configuration of the
MCT8315ZEVM.
b. If using analog Hall inputs, then remove J9-J11 and connect differential Hall inputs to HPx and HNx on
connector J12.
3. If using the MCT8315ZH or MCT8315ZT, then make sure resistors are populated in HW variant resistors for
desired device settings as described in Section 2.7.1.
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 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.
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 R5 potentiometer fully clockwise to set the motor to zero speed upon power up.
8. Flip the switch S1 to the right to configure BRAKE = RUN, switch S2 to the left to configure DIR = ABC,
switch S3 to the right to configure DRVOFF = ON.
9. Turn on the motor power supply.
10. Use the R5 potentiometer to control the speed of the motor, the R18 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 MCF8315Z GUI, refer to Section 3.1, to monitor the real-time speed of the motor,
put the MCT8315Z 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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2.2 Hardware Setup
The hardware required to run a motor is the MCT8315ZEVM, 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 MCT8315ZEVM:
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 MCT8315ZH or MCT8315ZT, populate the desired resistor settings in the “HW Variant Resistors”
silk screen box, see Table 2-3. If using the MCT8315ZR populate the resistors R13-R16 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 MCT8315ZEVM and computer.
6. Turn on the power supply and power up the PCB.
If using the MCT8315ZEVM 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 MCT8315ZEVM. The MCT8315ZEVM is designed for an input
supply from 4.5 V to 35 V and offers reverse-polarity protection and a Pi filter. The MCT8315ZEVM can
support all variants of the MCT8315Z device with locations for Hardware resistors, SPI resistors, and buck
components. Through the use of configurable shunts the MCT8315ZEVM can support many types of Hall
sensor configurations. For interfacing with the MCT8315Z GUI the MCT8315ZEVM has a FTDI chip to support
USB-to-UART and a MSP430.
Figure 2-2. MCT8315ZEVM 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 J8 on the MCT8315ZEVM.
Use connector J12 on the MCT8315ZEVM 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 J9-11. Otherwise, if using single-ended input
from a Hall sensor, connect to only the HPx pins for each phase and populate jumpers J9-J11.
Figure 2-3. Connections from Motor to MCT8315ZEVM
Figure 2-4 shows where the micro-USB cable is plugged into the MCT8315ZEVM 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.
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Figure 2-4. Micro-USB Connector and UART for MCT8315ZEVM
2.5 MSP430FR2355 Microcontroller
The MCT8315ZEVM 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 R5. 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 MCT8315Z, 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 MCT8315ZEVM 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, D5 and
D6, can be used for debug purposes as well.
The 18-pin shunt jumper bridge J6 ties all signals between the microcontroller and the MCT8315Z 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 MCT8315ZEVM as a standalone gate driver with an external
microcontroller.
Figure 2-5. MSP430FR2355 MCU on MCT8315ZEVM
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2.6 LED Lights
The MCT8315ZEVM has five status LEDs that provide the status of power supplies and functions of the
evaluation module. By default, the VM LED and VBK 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 MCT8315ZEVM LEDs (Default in Bold After Power Up)
Designator Name Color Description
D1 VBK Green Internal buck regulator is outputting
D2 nFAULT Red Lights up when fault condition has occurred on MCT8315Z
D3 VM Green Motor power is supplied to the board
D5 MSP_LED0 Red Used for UART or debugging
D6 MSP_LED1 Green Used for UART or debugging
Figure 2-6. MCT8315ZEVM LEDs
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2.7 User-Configurable Settings
The MCT8315ZEVM includes a variety of user-selectable jumpers, switches, and resistors on the entirety of the
evaluation board to configure settings. Table 2-2 summarizes the configurable settings on the MCT8315ZEVM.
Table 2-2. Description of User-Selectable Settings on MCT8315ZEVM (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
J13
HALL_PWR_SEL Selects Hall power source
Top
J13 = HALL_EXT External Hall power
J13 = VBK Hall power from
VBK
J9
HPA pullup Enables pullup on Hall positive A
(HPA) Top
J9 is inserted Pullup, use for
Digital Hall inputs
J9 is removed Floating, use for
Analog Hall inputs
J10
HPB pullup Enables pullup on Hall positive B
(HPA) Top
J10 is inserted Pullup, use for
Digital Hall inputs
J10 is removed Floating, use for
Analog Hall inputs
J11
HPC pullup Enables pullup on Hall positive C
(HPC) Top
J11 is inserted Pullup, use for
Digital Hall inputs
J11 is removed Floating, use for
Analog Hall inputs
J6
MSP to MCT Shunt
jumper bridge
Connects signals from MCU to
MCT8315Z 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 Clockwise
Right Counterclockwise
S3 DRVOFF Disables gate drivers Top Left MCT8315Z disabled
Right MCT8315Z enabled
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2.7.1 Hardware Variant Resistor Settings
The MCT8315ZH and MCT8315ZT devices uses configurable resistor dividers to control the MODE, SLEW, and
ADVANCE settings. When using the MCT8315ZH or MCT8315ZT:
• SPI enable resistors in the Pop. if SPI silkscreen box needs to be depopulated (R13–R16).
• DIR resistor R17 in the Pop. if HW silkscreen box needs to be populated.
• The resistor dividers in the HW Variant Resistors silkscreen box needs to be populated according to the
desired settings (R20–R22 and R26–R28).
This setup is shown in Figure 2-7.
Figure 2-7. Resistor Divider Settings for MCT8315ZH or MCT8315ZT (Hardware Variants)
Table 2-3 shows the user-adjustable resistor divider settings when using the MCT8315ZH or MCT8315ZT.
R20–R22 resistors connect to AVDD and R26–R28 resistors connect to AGND. The default resistor divider
configurations are in bold.
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Table 2-3. User-Adjustable Resistor Divider Settings for MCT8315ZH or MCT8315ZT (Defaults in Bold)
Setting Name Description
Resistors
(AVDD and
AGND)
Configuration Setting
MODE PWM Control Mode
Selects the
Hall configuration,
modulation,
Asynchronous
Rectification (ASR), and
Automatic Asynchronous
Rectification (AAR)
settings
R22 and R28
R28 = 0 Ω
Analog Hall Input, Asynchronous
modulation, ASR and AAR
Disabled
R28 = 22 kΩ
Digital Hall Input, Asynchronous
modulation, ASR and AAR
Disabled
R28 = 100 kΩ
Analog Hall Input, Synchronous
modulation, ASR and AAR
Disabled
R22 = R28 = 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%)
R21 and R27
R27 = 0 Ω 25 V/μs
R21 = R27 = DNP 50 V/μs
R21 = 47 kΩ 125 V/μs
R21 = 0 Ω 200 V/μs
ADVANCE Advance
Advances the lead angle
by a selectable value (in
electrical degrees)
R20 and R26
R26 = 0 Ω 0°
R26 = 22 kΩ 4°
R26 = 100 kΩ 11°
R20 = R26 = DNP 15°
R20 = 100 kΩ 20°
R20 = 22 kΩ 25°
R20 = 0 Ω 30°
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