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.

Trademarks

LaunchPad™ is a trademark of Texas Instruments.

All trademarks are the property of their respective owners.

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.

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)

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:

Connect motor phases to A, B, C on connector J8.
Do not turn on the power supply yet. Connect motor supply to VBAT/VM and PGND on connector J7.
1. 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.
2. To disable reverse-polarity protection and the Pi filter, connect to VM.
Select J3 to 5V_USB and J5 to 3V3COM to power MSP430 from USB power supply.
Connect the micro-USB cable into the computer.
Turn the potentiometer fully clockwise to set the motor to zero speed upon powerup.
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
Turn on the motor power supply.
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