ATS667LSGTN-T Allegro Microsystems Inc, ATS667LSGTN-T Datasheet - Page 9

• Manufacturer Part Number: ATS667LSGTN-T
• Description: 3-WIRE TRUE 0-SPEED HI ACCURACY GTS
• Manufacturer: Allegro Microsystems Inc
• Type: Special Purposer

Specifications of ATS667LSGTN-T

• Sensing Range: 70% of Air Gap Trip, 30% of Air Gap Release
• Voltage - Supply: 4 V ~ 24 V
• Current - Supply: 12mA
• Current - Output (max): 25mA
• Output Type: Digital, Open Collector
• Features: Gear Tooth Type
• Operating Temperature: -40°C ~ 150°C
• Package / Case: 4-SIP
• Operating Supply Voltage (min): 4V
• Operating Supply Voltage (typ): 5/9/12/15/18V
• Operating Supply Voltage (max): 24V
• Output Current: 20mA
• Package Type: SIP Module(SG)
• Pin Count: 4
• Mounting: Through Hole
• Operating Temp Range: -40C to 150C
• Operating Temperature Classification: Automotive
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 620-1328-2

ATS667LSG
Continuous Update of Switchpoints
Switchpoints are the threshold levels of the differential internal
analog signal, V
state. The value of V
density, B, induced by the target and sensed by the Hall elements.
As V
point, B
falls below B
state changes from low to high.
Figure 4. 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). Not detailed in the figure are the boundaries for peak capture DAC movement which intentionally limit the amount of
inward signal variation the IC is able to react to over a single transition. The algorithm is used to establish and subsequently update the device
switchpoints (B
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
switchpoints based on the fluctuation of V
B
PROC
HYS
1
2
3
4
OP
, the output state changes from high to low. As V
rises through a certain limit, referred to as the operate
Switchpoint
OP
B
B
B
B
B
B
B
B
(A) TEAG varying; cases such as
eccentric mount, out-of-round region,
normal operation position shift
to a certain limit, the release point, B
PROC
OP(#1)
RP(#1)
OP(#2)
RP(#2)
OP(#3)
RP(#3)
OP(#4)
RP(#4)
IC
OP
Target
PROC
and B
, at which the device changes output signal
is directly proportional to the magnetic flux
Smaller
TEAG
RP
Determinant
Peak Values
). The hysteresis, B
Pk
Pk
Pk
Pk
Pk
Pk
Pk
Pk
(#1)
(#2)
(#3)
(#4)
(#5)
(#6)
(#7)
(#8)
(C) Referencing the internal analog signal, V
, Pk
, Pk
, Pk
, Pk
, Pk
, Pk
, Pk
, Pk
(#2)
(#3)
(#4)
(#5)
(#6)
(#7)
(#8)
(#9)
True Zero-Speed, High Accuracy Gear Tooth Sensor IC
PROC
HYS(#x)
, as shown in panel C.
V+
IC
Target
, at each target feature configuration results from this recalibration, ensuring that it remains
RP
Larger
TEAG
, the output
Pk
(#1)
PROC
PROC
, shown in panel B. The Continuous Update algorithm is used to establish
Pk
V+
V
(#2)
PROC(BOP)
PROC
B
OP(#1)
As shown in panel C of figure 4, threshold levels for the ATS667
switchpoints are established as a function of the peak input signal
levels. The ATS667 incorporates an algorithm that continuously
monitors the input signal and updates the switching thresholds
accordingly with limited inward movement of V
switchpoint for each edge is determined by the detection of the
previous two signal edges. In this manner, variations are tracked
in real time.
0
B
, to continuously update device response
HYS(#1)
Pk
(#1)
Smaller
TEAG
V
(#3)
PROC(BRP)
B
RP(#1)
Pk
V
(#1)
PROC(BOP)
(#4)
(B) Internal analog signal, V
typically resulting in the IC
B
OP(#2)
B
(#2)
HYS(#2)
Pk
V
(#5)
Target Rotation (°)
PROC(BRP)
B
RP(#2)
Larger
TEAG
V
PROC
PROC(BOP)
Pk
(#2)
(Delimited by switchpoints)
(#6)
B
.
OP(#3)
(#3)
115 Northeast Cutoff
1.508.853.5000; www.allegromicro.com
Allegro MicroSystems, Inc.
Worcester, Massachusetts 01615-0036 U.S.A.
B
Hysteresis Band
Pk
HYS(#3)
V
(#7)
PROC(BRP)
B
RP(#3)
Pk
V
(#3)
PROC
PROC(BOP)
(#8)
B
OP(#4)
B
Smaller
,
TEAG
HYS(#4)
(#4)
Pk
V
(#9)
PROC(BRP)
B
RP(#4)
360
(#4)
PROC
. The
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