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參數(shù)資料
| 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)： | 3/15頁 |
| 文件大?。?/td> | 439K |
| 代理商： | ATS685LSHTN-T |
Two-Wire, Zero Speed
Differential Gear Tooth Sensor IC
ATS685LSH
11
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
Start Mode Hysteresis
This feature helps to ensure optimal self-calibration by rejecting
electrical noise and low-amplitude target vibration during initial-
ization. This prevents AGC from calibrating the device on such
spurious signals. Calibration can be performed using the actual
target features.
A typical scenario is shown in figure 7. The hysteresis, POHYS,
is a minimum level of the peak-to-peak amplitude of the internal
analog electrical signal, VPROC, that must be exceeded before the
ATS685 starts to compute switchpoints.
B
OP
B
RP
B
RP
B
RP(initial)
B
OP(initial)
1
4
2
3
Start Mode
Output Signal, ICC
If exceed PO
HYS
on high side
If exceed PO
HYS
on low side
IC Position
Relative to Target
Target Magnetic Profile
Differential Signal, VPROC
Target, Gear
Hysteresis, POHYS
Figure 7. Operation of Start Mode Hysteresis
At power-on (position 1), the ATS685 begins sampling VPROC.
At the point where the Start Mode Hysteresis, POHYS, is exceeded, the device establishes an initial switching threshold, by
using the Continuous Update algorithm. If VPROC is rising through the limit on the high side (position 2), the switchpoint is
BOP, and if VPROC is falling through the limit on the low side (position 4), it is BRP. After this point, Start Mode Hysteresis is
no longer a consideration. Note that a valid VPROC value exceeding the Start Mode Hysteresis can be generated either by a
legitimate target feature or by excessive vibration.
In either case (BOP or BRP), because the switchpoint is immediately passed as soon as it is established, the ATS685 en-
ables switching:
If on the high side, at BOP (position 2) the output would switch from low to high. However, because output is already high,
no output switching occurs.
At the next switchpoint, where BRP is passed (position 3), the output switches from high to low.
If on the low side, at BRP (position 4) the output switches from high to low.
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