ATS665LSGTN-T Allegro Microsystems Inc, ATS665LSGTN-T Datasheet - Page 15

• Manufacturer Part Number: ATS665LSGTN-T
• Description: IC SENSOR HALL GEAR TOOTH 4-SIP
• Manufacturer: Allegro Microsystems Inc
• Type: Special Purposer

Specifications of ATS665LSGTN-T

• Sensing Range: 70% of Air Gap Trip, 30% of Air Gap Release
• Voltage - Supply: 3.3 V ~ 24 V
• Current - Supply: 14mA
• Current - Output (max): 20mA
• Output Type: Digital, Open Collector
• Features: Gear Tooth Type
• Operating Temperature: -40°C ~ 150°C
• Package / Case: 4-SIP
• Operating Supply Voltage (min): 3.3V
• 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
• Other names: 620-1161-2

ATS665LSG
IC/Target Evaluation
In order to establish the proper operating specification for a par-
ticular IC/target system, a systematic evaluation of the magnetic
circuit should be performed. The first step is the generation of
a magnetic map of the target. By using a calibrated device, a
magnetic signature of the system is made. At right is a map of
the 60-0 reference target. Flux density shown is the differential of
the magnetic fields sensed at the two Hall elements.
A single curve is distilled from this map data that describes the
peak-peak magnetic field versus air gap. Knowing the minimum
amount of magnetic flux density that guarantees operation of the
IC, one can determine the maximum operational air gap of the
IC/target system. Referring to the chart below right, a minimum
required peak-peak signal of 60 G corresponds to a maximum air
gap of approximately 2.5 mm.
Target Design
For the generation of adequate magnetic field levels to maximize
air gap performance, the following recommendations should be
followed in the design and specification of targets.
·
·
·
·
·
Though these parameters apply to targets of traditional geometry
(radially oriented teeth with radial sensing), they can be applied
to stamped targets as well. For stamped geometries with axial
sensing, the valley depth is intrinsically infinite so the criteria for
tooth width, valley width, material thickness (can be < 3 mm) and
material specification need only be considered.
Accuracy
While the update algorithm will allow the IC to adapt to system
changes (i.e. air gap increase), major changes in air gap can
adversely affect switching performance. When characterizing IC
performance over a significant air gap range, be sure to re-power
the device at each air gap. This ensures that self-calibration
occurs for each installation condition. See the section entitled
Characteristic Data for typical duty cycle performance.
Tooth width > 2 mm
Valley width > 2 mm
Valley depth > 2 mm
Gear thickness > 3 mm
Target material must be low carbon steel
True Zero Speed, High Accuracy, Gear Tooth Sensor IC
700
600
500
400
300
200
100
-100
-150
-200
-250
-300
300
250
200
150
100
0
-50
50
0.5
0
0
5
1
ATS665LSG 60-0 TARGET MAP
10
1.5
0.94mm
1.19mm
1.44mm
1.69mm
1.94mm
115 Northeast Cutoff
1.508.853.5000; www.allegromicro.com
Allegro MicroSystems, Inc.
Worcester, Massachusetts 01615-0036 U.S.A.
15
Air Gap [mm]
Position [º]
2
20
2.19mm
2.44mm
2.69mm
2.94mm
3.19mm
2.5
25
3
30
35
14
3
.5