ATS665LSGTN Allegro Microsystems Inc, ATS665LSGTN Datasheet - Page 13

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

Specifications of ATS665LSGTN

• 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
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Switchpoints
Switchpoints in the ATS665 are established dynamically as a per-
centage of the amplitude of the normalized magnetic signal. Two
DACs track the peaks of the normalized magnetic signal (see the
section on Update); the switching thresholds are established at
30% and 70% of the two DAC’s values. The proximity of the
thresholds near 50% ensures the most accurate and consistent
switching where the signal is steepest and least affected by air
gap variation.
The hysteresis of 40% provides high air gap performance and
ATS665LSG
100 %
70 %
30 %
0 %
True Zero Speed, High Accuracy, Gear Tooth Sensor IC
Switching Threshold Levels
immunity to false switching on noise, vibration, backlash and
other transient events. Since the hysteresis value is independent
of air gap, it provides protection against false switching in the
presence of overshoot that can be induced on the edges of large
teeth.
The figure below graphically demonstrates the establishment of
the switching threshold levels. Because the threshold are estab-
lished dynamically as a percentage of the peak-peak signal, the
effect of a baseline shift is minimized. As a result, the effects of
offsets induced by tilted or off-center installation are minimized.
Bop
Brp
115 Northeast Cutoff
1.508.853.5000; www.allegromicro.com
Allegro MicroSystems, Inc.
Worcester, Massachusetts 01615-0036 U.S.A.
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