Diodes AH5794 - Manual (Page 6)

AH5794
SINGLE PHASE HALL EFFECT LATCH FAN MOTOR DRIVER
AH5794
Document number: DS35809 Rev. 1 - 2
6 of 13
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March 2012
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NEW PROD
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T
Operating Characteristics (Note 6, 7, 8 and 9)
FG
O1
O2
Ton Toff
“Re-start spinning”
motor locked cleared motor locked detected
Mechanical lock
Magentic
S
N
Normal spinning
Truth Table
O1 O2 FG
L H L
H L H
L L
X
(Note 9)
Notes: 6. In “Normal spinning, the FG changes its state at each edge of O1.
7. When the motor locks with South pole at the Hall element, O2 is kept on “L” and O1 is a clock with Ton/Toff ratio.
When motor locks with North pole at the Hall element, O1 is kept on “L”, O2 is a clock with Ton/Toff ratio.
8. When “Re-start spinning” occurs, the motor speed ramps up to the “Normal Spinning” speed from zero.
Speed ramp-up profile depends on motor characteristics.
9. X: H or L depends on magnetic pole North or South