Datasheet AH3975Q, AH3976Q, AH3977Q, AH3978Q (Diodes) - 5

AH3975Q/AH3976Q/AH3977Q/AH3978Q Magnetic Characteristics
(Notes 6, 9) (TA = -40°C to +150°C, VDD = 2.7V to 27V, unless otherwise specified.)
Magnetic Magnetic Operating Point Release Point Hysteresis Matching Offset TC Output Part Name BOP (Gauss) BRP (Gauss) BHYS (Gauss) (Gauss) (Gauss) (ppm/°C) (Note 10
)
(Note 10
)
Min Typ Max Min Typ Max Min Typ Max Min Max Min Max Typ SPD DIR Q1 Q2
AH3975Q -10 10 30 -30 -10 10 5 20 35 -25 25 -15 15 -350 V V — — AH3976Q 8 25 42 -42 -25 -8 32 50 68 -20 20 -20 20 -350 V V — — AH3977Q 50 75 100 -100 -75 -50 120 150 180 -30 30 -20 20 -350 V V — — AH3978Q 50 75 100 -100 -75 -50 120 150 180 -30 30 -20 20 -350 — — V V Notes: 9. Positive x-axis direction indicates the south pole approaching the part marking surface i.e. increasing south pole magnetic field strength to the sensor; reversing direction x-axis toward 0 means the decreasing south magnetic field strength to the sensor. Negative x-axis indicates north pole magnetic field to the part marking surface. 10. TA = +25°C, VDD = 2.7V to 27V. Output
CCW CW
(off-state) V S DD
S N ) e g a
Part mark
t N S l
Bhy
o V t
Turn off Turn on
3 2 1 u
Branded side
p t CW : u
N
H2 H1
DIR output High state
O CCW : (
(on-state)
4 5
DIR output Low state V OUT_ON = VOUT(SAT)
(TSOT-25) H2 H1 4 Top View 5 TSOT25 (Type A1) B-
Brp 0 Bop
B+ ( Magnetic Flux Density B ) Operating Characteristics Timing Diagrams for the Speed and Direction Output SP/DIR and Two Speed Outputs Q1/Q2
BOP
Magnetic Field at Hall element H1
0 BRP BOP
Magnetic Field at
0
Hall element H2
BRP
Two Speed
Q1
output SP
/Q2
DIR Count Signal Delay tDC
T t DC DC T t DC DC
DIR
50% t 90% TDC DC 50%
SP
10% TR TF tR tF AH3975Q/AH3976Q/AH3977Q/AH3978Q 5 of 18 April 2023 Document number: DS43743 Rev. 1 - 2
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