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Programmable Back Biased Hall-Effect
Switch with TPOS Functionality
4
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
ATS636LSE
MAGNETIC CHARACTERISTICS over operating voltage and junction temperature range using reference target; unless otherwise noted
Characteristics
Symbol
Test Conditions
Min.   Typ.   Max.    Unit
Number of Programming Bits
Switchpoint

7

bit
Switchpoint Polarity

1

bit
Programming Lock

1

bit
Gear Tooth / Proximity Characteristics (Low switchpoint only)
Programming Air Gap Range
1
AG
Range
Temperature = 25癈, Code = 127
2.5    

mm
Temperature = 25癈, Code = +127

    1.5    mm
Programming Resolution
AG
Res
Temperature = 25癈 Program Air Gap = 2.5 mm        0.05    
mm
Air Gap Drift Over Full Temperature
Range
2
AG
Drift
Device programmed to 2.5 mm
    0.2    
mm
Polarity
P
Over tooth (ATS636LSE)
    Low    

Over valley (ATS636LSE)
    High    

1
The switchpoint will vary over temperature. A sufficient margin obtained through customer testing is required to guarantee functionality over
temperature. Programming at larger air gaps leaves no safety margin for switchpoint drift. See the applications note Proximity Sensing
Programming Technique on the Allegro website at http://www.allegromicro.com for additional information.
2
The switchpoint will vary over temperature, proportionally to the programmed air gap. This parameter is based on characterization data and is not
a tested parameter in production. Switchpoint air gap generally drifts downward as temperature increases.
 
 
 
Tooth and Valley Field vs. Air Gap
 Reference Target
0
200
400
600
800
1000
1200
1400
0.0  0.5  1.0  1.5  2.0  2.5  3.0  3.5  4.0  4.5  5.0  5.5  6.0
Air Gap [mm]
Reference Target Tooth
Reference Target Valley
Reference Target Tooth and Valley Field vs. Air Gap
Reference Target Flux Density vs. Position
0
200
400
600
800
1000
1200
1400
0  30  60  90  120 150 180 210 240 270 300 330 360
Position (?
0.25
0.50
0.75
1.00
1.25
1.50
1.75
2.00
2.25
2.50
2.75
3.00
3.25
3.50
3.75
4.00
4.25
4.50
4.75
5.00
5.25
5.50
5.75
6.00
Reference Target Flux Density vs. Position: Typical
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