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ATS665LSG
True Zero-Speed Hall-Effect Adaptive Gear-Tooth Sensors
Sumzi
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 ¡ª 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¡ã to 150¡ã (L).

Functional Block Diagram

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