Contents
Variable Speed DC Fan Control using the MC9RS08KA2
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Variable Speed DC Fan Control using the MC9RS08KA2
Revision History
Freescale Semiconductor
Table of Contents
Freescale Semiconductor
Chapter Introduction
Introduction
Freescale’s New Generation Ultra Low Cost MCU
DC Fan Reference Design Targets
Bi-Phase Bldc Motor
Bi-Phase Bldc Motor Diagram
Freescale Semiconductor
Rotor Position Control
Chapter Motor Control
Commutation
Commutation Waveforms
Speed Control
Fault Detection
Motor Startup
Freescale Semiconductor
Hardware Resources
Block Diagram
Chapter Implementation
Control Loop
Firmware Control Loop
Temperature Sensor Measurement
= V DD⎜ RC⎟
Acmpsc
#63, Mtimmod
ACMPSCACF, Acmpsc
Temperature Conversion
Temperature Conversion Table
Freescale Semiconductor
VR1
Freescale Semiconductor
Appendix B Program Listing
Mtimtclkrising
Rtidisable
Mtimtclkfalling
Acmpoutputboth
MAPADDR6NVICSTRM, Icstrm $3FFA
#HIGH613NVICSTRM, Pagesel
MAPADDR6NVFTRIM, Icssc
#ICSDIV2, ICSC2
#MTIMBUSCLKMTIMDIV256, Mtimclk
Kbies
Kbipe
#255, Mtimmod
MAPADDR6SRS
Rts Drive coil
KBISCKBACK, Kbisc
MTIMSCTOF, Mtimsc
#6, Mtimmod
Kbisc
BUZZER, Ptad
#24, Mtimmod
#30, Mtimmod
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