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| 型號： | ATS685LSHTN-T |
| 元件分類： | 磁阻傳感器 |
| 英文描述： | MAGNETIC FIELD SENSOR-HALL EFFECT, 5-150mT, CYLINDRICAL, THROUGH HOLE MOUNT |
| 封裝： | LEAD FREE, PLASTIC, SIP-4 |
| 文件頁數(shù)： | 15/15頁 |
| 文件大?。?/td> | 439K |
| 代理商： | ATS685LSHTN-T |
Two-Wire, Zero Speed
Differential Gear Tooth Sensor IC
ATS685LSH
9
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
(A) TEAG varying; cases such as
eccentric mount, out-of-round region,
normal operation position shift
(B) Internal analog signal, VPROC,
typically resulting in the IC
0
B
OP
B
RP
B
OP
B
RP
B
OP
B
RP
B
OP
B
RP
B
OP
B
OP
B
RP
360
Target Rotation (°)
Hysteresis Band
(Delimited by switchpoints)
V
PROC
(V)
V+
(C) Internal analog signal, VPROC, representing
magnetic field for digital output
V
PROC
(V)
V
OUT
(V)
V+
Larger
TEAG
Smaller
TEAG
IC
Target
Larger
TEAG
Target
IC
Smaller
TEAG
Smaller
TEAG
Figure 5. The Continuous Update algorithm allows the Allegro IC to interpret and adapt to variances in the magnetic field generated by the target
as a result of eccentric mounting of the target, out-of-round target shape, and similar dynamic application problems that affect the TEAG (Total
Effective Air Gap). As shown in panel A, the variance in the target position results in a change in the TEAG. This affects the IC as a varying
magnetic field, which results in proportional changes in the internal analog signal, VPROC, shown in panel B. The Continuous Update algorithm is
used to establish switchpoints based on the fluctuation of VPROC, as shown in panel C.
Continuous Update of Switchpoints
Switchpoints are the threshold levels of the differential internal
analog signal, VPROC, at which the device changes output signal
state.The value ofVPROCisdirectlyproportionaltothemagneticflux
density, B, induced by the target and sensed by the Hall elements.
As VPROC rises through a certain limit, referred to as the operate
point, BOP, the output state changes from high to low. As VPROC
falls below BOP to a certain limit, the release point, BRP, the output
state changes from low to high.
As shown in figure 5, threshold levels for the switchpoints are
established as a function of the peak input signal levels. The device
incorporates an algorithm that continuously monitors the input signal
and updates the switching thresholds accordingly with limited inward
movement of VPROC. The switchpoint for each edge is determined
by the detection of the previous two signal edges. In this manner,
variations are tracked in real time.
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