AN2687 Freescale Semiconductor / Motorola, AN2687 Datasheet - Page 7

• Manufacturer Part Number: AN2687
• Description: BLDC Fan Control using the MC68HC908QT2
• Manufacturer: Freescale Semiconductor / Motorola

MOTOROLA
Freescale Semiconductor, Inc.
IRQ
BLDC Fan Control using the MC68HC908QT2
For More Information On This Product,
Figure 7. Actual Temperature and Speed Result in the Demos
off-time
L1 synchronized with falling edge of Hall signal
ICAP
Figure 6. Commutation and Speed Control Signals
off-time
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L2 synchronized with rising edge of Hall signal
IRQ
on-time
ICAP
on-time
PART 2: HARDWARE DESIGN
Hall Signal
L1 (Q1, pin3)
Full Speed
L2 (Q2, pin3)
Full Speed
L1 (Q1, pin3)
Speed depends
on off-time
L2 (Q2, pin3)
Speed depends
on off-time
AN2687/D
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