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