AN2687 Freescale Semiconductor / Motorola, AN2687 Datasheet

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AN2687

Manufacturer Part Number
AN2687
Description
BLDC Fan Control using the MC68HC908QT2
Manufacturer
Freescale Semiconductor / Motorola
Datasheet
Application Note
AN2687/D
Rev. 0, 3/2004
BLDC Fan Control using the
MC68HC908QT2
By T.C. Lun
PART1: INTRODUCTION
Applications Engineering
Microcontroller Division
Hong Kong
This application note describes the use of the MC68HC908QT2 microcontroller
to control a brushless DC (BLDC) fan, like the ones used in a personal
computer (PC) case.
The text is divided into the following parts:
For detailed specification on the MC68HC908QT2 device, please refer to the
data sheet; Motorola order number: MC68HC908QY4/D.
In the past few years, many types of data processing equipment have become
compact, with higher processing power and higher speed. Due to these
performance enhancements there is the need for an increase in cooling
capability by the cooling fan. These include: variable speed control to reduce
acoustic noise and save energy, thermal management, mechanical wear, and
fault protection.
This application note describes a thermal speed control solution for the BLDC
fan. The suggested solution uses a simple speed control algorithm to control
the speed of the fan in typical applications where acoustic noise, energy-
saving, thermal management, and fault protection are of concern.
Freescale Semiconductor, Inc.
For More Information On This Product,
PART 1: Introduction
PART 2: Hardware design
PART 3: Software design
PART 4: Further development
APPENDIX A: Schematics and PCB layouts
APPENDIX B: Code Listings
Go to: www.freescale.com
© Motorola, Inc., 2004

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