Two-Wire, Zero Speed
Differential Gear Tooth Sensor IC
ATS685LSH
11
Allegro MicroSystems, LLC
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, PO
HYS
,
is a minimum level of the peak-to-peak amplitude of the internal
analog electrical signal, V
PROC
, 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, I
CC
If exceed PO
HYS
on high side
If exceed PO
HYS
on low side
IC Position
Relative to Target
Target Magnetic Profile
Differential Signal, V
PROC
Target, Gear
Hysteresis, PO
HYS
Figure 7. Operation of Start Mode Hysteresis
" At power-on (position 1), the ATS685 begins sampling V
PROC
.
" At the point where the Start Mode Hysteresis, PO
HYS
, is exceeded, the device establishes an initial switching threshold, by
using the Continuous Update algorithm. If V
PROC
is rising through the limit on the high side (position 2), the switchpoint is
B
OP
, and if V
PROC
is falling through the limit on the low side (position 4), it is B
RP
. After this point, Start Mode Hysteresis is
no longer a consideration. Note that a valid V
PROC
value exceeding the Start Mode Hysteresis can be generated either by a
legitimate target feature or by excessive vibration.
" In either case (B
OP
or B
RP
), because the switchpoint is immediately passed as soon as it is established, the ATS685 en-
ables switching:
?/SPAN> If on the high side, at B
OP
(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 B
RP
is passed (position 3), the output switches from high to low.
? If on the low side, at B
RP
(position 4) the output switches from high to low.
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