ATS643LSH-I1TN Allegro Microsystems Inc, ATS643LSH-I1TN Datasheet - Page 10

• Manufacturer Part Number: ATS643LSH-I1TN
• Description: IC SENSOR GEAR TOOTH 4-SIP
• Manufacturer: Allegro Microsystems Inc
• Type: Special Purposer

Specifications of ATS643LSH-I1TN

• Sensing Range: 65% Trip, 35% Release
• Voltage - Supply: 4 V ~ 24 V
• Current - Supply: 8mA
• Output Type: Digital, Open Collector
• Features: Gear Tooth Type
• Operating Temperature: -40°C ~ 150°C
• Package / Case: 4-SIP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Current - Output (max): -

ATS643LSH
induced by the target and sensed by the Hall elements. When
V
higher or lower level, it triggers IC switch turn-on and turn-off.
As shown in figure 3, when the switch is in the off state, as
V
point, B
in the on state, as V
release point, B
Figure 4. The Continuous Update algorithm allows the Allegro IC to immediately interpret and adapt to significant variances in the magnetic field gener-
ated by the target as a result of eccentric mounting of the target, out-of-round target shape, elevation due to lubricant build-up in journal gears, and
similar dynamic application problems that affect the TEAG (Total Effective Air Gap). The algorithm is used to dynamically establish and subsequently
update the device switchpoints (B
it remains properly proportioned and centered within the peak-to-peak range of the internal analog signal, V
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, V
based on the fluctuation of V
B
PROC
PROC
HYS
1
2
3
4
transitions through a switchpoint from the appropriate
rises through a certain limit, referred to as the operate
OP
Switchpoint
, the switch toggles from off to on. When the switch is
B
B
B
B
B
B
B
B
OP(#1)
OP(#2)
OP(#3)
OP(#4)
RP(#1)
RP(#2)
RP(#3)
RP(#4)
RP
(A) TEAG varying; cases such as
eccentric mount, out-of-round region,
normal operation position shift
, the switch toggles from on to off.
IC
PROC
Target
Determinant
Peak Values
Pk
Pk
Pk
Pk
Pk
Pk
Pk
Pk
falls below B
PROC
(#1)
(#2)
(#3)
(#4)
(#5)
(#6)
(#7)
(#8)
Smaller
TEAG
(C) Referencing the internal analog signal, V
, Pk
, Pk
, Pk
, Pk
, Pk
, Pk
, Pk
, Pk
, as shown in panel C.
OP
and B
(#2)
(#3)
(#4)
(#5)
(#6)
(#7)
(#8)
(#9)
RP
OP
). The hysteresis, B
Gear Tooth Sensor IC with Continuous Update
to a certain limit, the
PROC
IC
Target
, shown in panel B. The Continuous Update algorithm is used to establish accurate switchpoints
V+
Self-Calibrating, Zero-Speed Differential
Larger
TEAG
HYS(#x)
Pk
, at each target feature configuration results from this recalibration, ensuring that
(#1)
V+
PROC
Pk
B
OP(#1)
As shown in panel C of figure 4, threshold levels for the ATS643
switchpoints are established dynamically as function of the
peak input signal levels. The ATS643 incorporates an algorithm
that continuously monitors the system and updates the switch-
ing thresholds accordingly. The switchpoint for each edge is
determined by the detection of the previous two edges. In this
manner, variations are tracked in real time.
(#2)
0
, to continuously update device response
Smaller
TEAG
Pk
B
(#3)
RP(#1)
B
HYS(#1)
Pk
B
(#4)
OP(#2)
(B) Internal analog signal, V
typically resulting in the IC
Pk
B
Target Rotation (°)
(#5)
RP(#2)
B
HYS(#2)
Larger
TEAG
Pk
B
OP(#3)
(#6)
(Delimited by switchpoints)
PROC
115 Northeast Cutoff
1.508.853.5000; www.allegromicro.com
Allegro MicroSystems, Inc.
Worcester, Massachusetts 01615-0036 U.S.A.
Pk
Hysteresis Band
.
B
(#7)
RP(#3)
B
HYS(#3)
Pk
B
OP(#4)
(#8)
PROC
Pk
Smaller
B
,
TEAG
(#9)
RP(#4)
B
HYS(#4)
360
t+
10