ATS665LSG
True Zero-Speed Hall-Effect Adaptive Gear-Tooth Sensor IC

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Features and Benefits

• True zero-speed operation
• Switchpoints independent of air gap
• High vibration immunity
• Precise duty cycle signal over operating temperature range
• Large operating air gaps
• Defined power-on state
• Wide operating voltage range
• Digital output representing target profile
• Single-chip sensing IC for high reliability
• Small mechanical size
• Optimized Hall IC magnetic system
• 200 μs power-on time at gear speed <100 rpm
• AGC and reference adjust circuit
• Undervoltage lockout

Description

The ATS665 true zero-speed gear tooth sensor IC is an optimized Hall IC/rare earth pellet configuration designed to provide a user-friendly solution for digital gear tooth sensing applications. The over-molded package, holds together a samarium cobalt pellet, a pole piece and a true zero-speed Hall IC that has been optimized to the magnetic circuit. This small package can be easily assembled and used in conjunction with gears of various shapes and sizes.

The device incorporates a dual element Hall IC that switches in response to differential magnetic signals created by a ferromagnetic target. The IC contains a sophisticated compensating circuit designed to reduce the detrimental effects of magnet and system offsets. 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 adaptive switching thresholds of the device. Hysteresis in the thresholds reduces the negative effects of any anomalies in the magnetic signal associated with the targets used in many automotive applications.

This ATS665’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°C to 150°C (L). It is lead (Pb) free with 100% matte tin leadframe plating.

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Functional Block Diagram

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