ATS657 查看數據表（PDF） - Allegro MicroSystems
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ATS657 Datasheet PDF : 15 Pages
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ATS657
Dynamic, Self-Calibrating, Threshold-Detecting, Differential
Speed and Direction Hall-Effect Gear Tooth Sensor IC
OPERATING CHARACTERISTICS: Switchpoint Characteristics Valid over operating voltage and temperature ranges,
unless otherwise noted (refer to figure below)
Characteristics
Symbol
Test Conditions
Min. Typ. Max.
Unit
Target Frequency, Forward Rotation
fFWD
–
–
12
kHz
Target Frequency, Reverse Rotation
fREV
–
–
6
kHz
Target Frequency, Non-Direction Pulses*
fND
–
–
4
kHz
Bandwidth
f-3dB Cutoff frequency for low-pass filter
15
20
–
kHz
Operate Point
BOP
% of peak-to-peak VPROC referenced from
PDAC to NDAC, AG < AGmax
–
70
–
%
Release Point
BRP
% of peak-to-peak VPROC referenced from
PDAC to NDAC, AG < AGmax
–
30
–
%
*At power-on, rotational speed or vibration leading to a target frequency greater than 4 kHz may result in a constant high output state until true
direction is detected.
Sensed Edgea
Reverse
Forward
Tooth
Valley
+B
BOP(FWD)b
BOP(REV)b
BRP(FWD)
BRP(REV)
–B
+V
VPROC(BOP)
VPROC(BRP)
–V
BOP %
BRP %
100 %
t
aSensed Edge: leading (rising) mechanical edge in forward rotation, trailing (falling) mechanical edge in reverse rotation
bBOP(FWD) triggers the output transition during forward rotation, and BOP(REV) triggers the output transition during reverse rotation
OPERATING CHARACTERISTICS: Output Pulse Characteristics* Valid over operating temperature range, unless otherwise noted
Characteristics
Symbol
Test Conditions
Min. Typ. Max.
Unit
Pulse Width, Forward Rotation
tw(FWD) RL = 500 Ω, CL = 10 pF
Pulse Width, Reverse Rotation
tw(REV) RL = 500 Ω, CL = 10 pF
Pulse Width, Non-Direction
tw(ND) RL = 500 Ω, CL = 10 pF
*Measured at a threshold of ( ICC(HIGH) + ICC(LOW) ) / 2.
38
45
52
μs
76
90
104
μs
153
180
207
μs
Allegro MicroSystems, Inc.
4
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
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