ATS674LSETN-LT Allegro Microsystems Inc, ATS674LSETN-LT Datasheet - Page 14

• Manufacturer Part Number: ATS674LSETN-LT
• Description: IC SENSOR GEAR TOOTH 4LEAD
• Manufacturer: Allegro Microsystems Inc
• Type: Special Purposer

Specifications of ATS674LSETN-LT

• Sensing Range: 30% of Air Gap Trip, 40% of Air Gap Release
• Voltage - Supply: 3.3 V ~ 26.5 V
• Current - Supply: 11mA
• Current - Output (max): 20mA
• 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

ATS673 and
ATS674
Update
The ATS673 and ATS674 incorporate an algorithm that continu-
ously monitors the system and updates the switching thresholds
accordingly. The switchpoint for each transition is determined
by the previous two transitions. Because variations are tracked in
Figure 9. 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
Switchpoint
B
B
B
B
B
B
B
B
OP1
OP2
OP3
OP4
RP1
RP2
RP3
RP4
(A) TEAG varying; cases such as
eccentric mount, out-of-round region,
normal operation position shift
IC
Target
Determinant
Peak Values
PROC
Smaller
TEAG
Pk
Pk
Pk
Pk
Pk
Pk
Pk
Pk
(C) Referencing the internal analog signal, V
1
2
3
4
5
6
7
8
, as shown in panel C.
OP
, Pk
, Pk
, Pk
, Pk
, Pk
, Pk
, Pk
, Pk
and B
Optimized for Automotive Cam Sensing Applications
2
3
4
5
6
7
8
9
RP
). The hysteresis, B
PROC
Self-Calibrating TPOS Gear Tooth Sensor ICs
IC
Target
, shown in panel B. The Continuous Update algorithm is used to establish accurate switchpoints
V+
Larger
TEAG
HYS(#x)
, at each target feature configuration results from this recalibration, ensuring that
Pk
1
V+
PROC
Pk
real time, the IC has high immunity to target run-out and retains
excellent accuracy and functionality in the presence of both
run-out and transient mechanical events. Figure 9 shows how the
devices use historical data to provide the switching thresholds
for a given edge.
B
0
OP1
2
, to continuously update device response
Smaller
TEAG
Pk
B
HYS
B
3
RP1
Pk
B
(B) Internal analog signal, V
typically resulting in the IC
B
HYS
4
OP2
Pk
Target Rotation (°)
B
B
5
RP2
HYS
Larger
TEAG
(Delimited by switchpoints)
B
Pk
B
HYS
PROC
OP3
6
115 Northeast Cutoff, Box 15036
Allegro MicroSystems, Inc.
Worcester, Massachusetts 01615-0036 [phone]
www.allegromicro.com
Hysteresis Band
B
.
Pk
HYS
B
7
RP3
B
Pk
B
HYS
PROC
OP4
8
Smaller
Pk
,
TEAG
B
B
9
HYS
RP4
B
360
HYS
t+
13