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A1667 Datasheet(Hoja de datos) 10 Page - Allegro MicroSystems

No. de Pieza. A1667
Descripción  True Zero-Speed, High Accuracy, Ring Magnet Sensor IC
Descarga  15 Pages
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Fabricante  ALLEGRO [Allegro MicroSystems]
Página de inicio  http://www.allegromicro.com
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True Zero-Speed, High Accuracy, Ring Magnet Sensor IC
A1667
10
Allegro MicroSystems, LLC
955 Perimeter Road
Manchester, NH 03103-3353 U.S.A.
www.allegromicro.com
BRP
BOP
BOP
BOP(initial)
BRP(initial)
1
4
2
3
Start Mode
Hysteresis, POHYS
Output Signal, VOUT
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, Ring Magnet
N
S
S
START MODE HYSTERESIS
This feature helps to ensure optimal self-calibration by rejecting
electrical noise and low-amplitude target vibration during
initialization.ThispreventsAGCfromcalibratingtheIConsuch
spurious signals. Calibration can be performed using the actual
target features.
Atypicalscenarioisshowninfigure6.TheStartModeHysteresis,
POHYS, is a minimum level of the peak-to-peak amplitude of the
internal analog electrical signal, VPROC, that must be exceeded
before the A1667 starts to compute switchpoints.
Figure 6. Operation of Start Mode Hysteresis
• At power-on (position 1), the A1667 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 falling through the limit on the low side (position 2), the switchpoint is BRP, and if VPROC is rising through the limit on the
high side (position 4), it is BOP . 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, because the switchpoint is immediately passed as soon as it is established, the A1667 enables switching:
--If on the low side, at BRP (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 BOP is passed (position 3), the output switches from high to low.
--If on the high side, at BOP (position 4) the output switches from high to low.
As this example demonstrates, initial output switching occurs with the same polarity, regardless of whether the Start Mode Hysteresis is exceeded on the
high side or on the low side.




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