ATS665LSG
True Zero-Speed Hall-Effect Adaptive Gear-Tooth Sensors
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0665.pdf

Features and Benefits

• True zero-speed operation
• Air-gap independent switch points
• High vibration immunity
• Precise duty cycle over temperature
• Large operating air gap range
• Defined power-on state
• Wide operating voltage range
• Digital output representing target profile
• Single-chip sensing IC for high reliability
• Small mechanical size (8 mm diameter x 5.5 mm length)
• Optimized Hall IC magnetic circuit
• Short power up time
• AGC and reference adjust circuit
• Under-voltage lockout

Description

The ATS665LSG is an optimized Hall IC/magnet configuration packaged as a module that provides a user-friendly solution for digital gear-tooth-sensing applications. This digital differential Hall-effect sensor is the choice when repeatability and timing accuracy count. The module incorporates patented self-calibration circuitry that nulls out the effects of installation air gap, ambient temperature, and magnet offsets to provide superior timing accuracy with symmetrical targets over large operating air gaps — typical of targets used in speed-sensing automotive transmission applications. The self-calibration at power up keeps the performance optimized over the life of the sensor. The ATS665LSG has an open-collector output for direct digital interfacing with no further signal processing required.

The integrated circuit incorporates a dual-element Hall-effect sensor and signal processing that switches in response to differential magnetic signals created by a ferrous target. The circuitry contains a sophisticated digital circuit to eliminate the detrimental effects of magnet and system offsets and to achieve true zero-speed operation. Digital processing of the analog signal provides zero-speed performance independent of air gap and also dynamic adaptation of device performance to the typical operating conditions found in automotive applications (reduced vibration sensitivity). High-resolution, peak detecting DACs are used to set the switching thresholds; hysteresis reduces the negative effects of any anomalies in the magnetic signal associated with the target.

This sensor’s ability to provide tight duty cycle at high speeds and over a wide temperature range makes it ideal for transmission and industrial speed applications. The ATS665 is available in the SG package in the automotive temperature range, -40° to 150° (L).

Functional Block Diagram

Part Number	Package Type	RoHS	Temperature
		Compliant
ATS665LSG	4-lead module	No	-40 °C to  150 °C
ATS665LSGTN	4-lead module	No	-40 °C to  150 °C
ATS665LSGTN-T	4-lead module	Yes	-40 °C to  150 °C

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