Automotive Motor Control Solutions
Target Automotive
Applications
• Heating, ventilation and air
conditioning (HVAC)
• Engine cooling fan
• Electric pumps, motor control
and auxiliaries
• Transmission and gearbox
• Doors, window lift and seat control
3-phase Sensorless BLDC Motor
Control Reference Design using
Kinetis KEA128
Overview
The KEA128BLDCRD motor control reference design based on the Kinetis KEA128
32-bit ARM
®
Cortex
®
-M0+ automotive MCU represents an example of a 3-phase
sensorless brushless DC (BLDC) motor control solution using six-step commutation
process, including closed-loop speed control and dynamic motor current limitation.
The overall hardware solution consists of the KEA128 MCU, MC33903 system
basis chip, and MC33937A 3-phase field effect transistor pre-driver. This Freescale
integrated circuit ecosystem represents a BLDC motor control solution for the 12 V
automotive systems.
The motor control application is built upon the algorithm building blocks provided
by the Automotive Math and Motor Control Library Set for ARM Cortex-M0+. These
include 16-bit and 32-bit fixed point arithmetic based elemental mathematical
functions, PI controllers, and digital filters.
KEA128BLDCRD Reference
Design Features
• 32-bit KEA128 MCU
• MC33937A FET pre-driver
• MC33903D system basis chip
• Sensorless control using back-EMF
zero-crossing detection
• DC-bus overvoltage, undervoltage, and
overcurrent fault detection
• Application built using the Automotive
Math and Motor Control Library Set
functions
• FreeMASTER tool for instrumentation/
visualization
• Integrated Motor Control Application
Tuning (MCAT) tool
• LIN & CAN connectivity support
• OpenSDA debug interface
Motor Control Reference Design Hardware
Application data visualization and control
is provided by the FreeMASTER run-time
debugging tool. Integrated Motor Control
Application Tuning (MCAT) tool allows run-time
tuning of the application parameters.
FreeMASTER Project Page with MCAT GUI
KEA128 Features
• 32-bit ARM Cortex-M0+ CPU core with
frequency up to 48 MHz
• 128 KB of flash, 16 KB of SRAM
• One MSCAN and three UARTs with
LIN support
• One 12-bit SAR ADC with 16 channels and
external trigger control
• 6-channel 16-bit FlexTimer with
complementary PWM, dead time insertion,
and fault protection
• Two 2-channel 16-bit FlexTimers
MC33937A Features
• Fully specified from 8.0 to 40 V (covers
12 and 24 V automotive systems)
• Extended operating range from 6.0 to 58 V
(covers 12 and 24 V systems)
• Greater than 1.0 A gate drive capability
with protection
• Protection against reverse charge injection
from C
GD
and C
GS
capacitances of
external FETs
• SPI programmable dead time
• Includes a charge pump to support full FET
drive at low battery voltages
• Simultaneous output capability enabled via
safe SPI command
• Integrated current-sense amplifier with
overcurrent comparator
Software Tools
Name
Automotive Math and Motor Control Library Set
FreeMASTER
Motor Control Application Tuning (MCAT) Tool
CodeWarrior for Microcontrollers 10.6
Web link
freescale.com/AutoMCLib
freescale.com/FREEMASTER
freescale.com/MCAT
freescale.com/CodeWarrior
Six-step Commutation BLDC Motor Control Algorithm Concept
MC33903 Features
• 5 or 3.3 V voltage regulator with current,
temperature and voltage protection
• One CAN and up to two LIN transceivers
• Advanced SPI, MCU, ECU power supply
and critical pin diagnostics and monitoring
• Extremely low quiescent current in low
power modes
For current information please visit
freescale.com/KEA128BLDCRD
Freescale, the Freescale logo and Kinetis are trademarks of Freescale Semiconductor, Inc., Reg. U.S. Pat. & Tm. Off. All other
product or service names are the property of their respective owners. ARM and Cortex are registered trademarks of ARM Limited
(or its subsidiaries) in the EU and/or elsewhere. All rights reserved. © 2014 Freescale Semiconductor, Inc.
Doc Number: KEA128BLDCRDFS REV 0
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