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Related Links:

Datasheets:
ATS635LSE and ATS636LSE: Programmable Back Biased Hall-Effect Switch with TPOS Functionality (PDF)

Selection Guides:
Hall-Effect Sensors,

Gear-Tooth Hall-Effect Speed Sensors

when this product is updated

Technical Publications:
Programming a Back Biased Switch for Proximity Sensing / Proximity Sensing Programming Technique

Product Evaluation Kits:
ASEK-01 Sensor Evaluation Kit

ATS635LSE and ATS636LSE
Programmable Back Biased Hall-Effect Switch with TPOS Functionality

Features and Benefits

• Chopper Stabilization
  • Extremely low switch-point drift over temperature
• On-chip Protection
  • Supply transient protection
  • Output short-circuit protection
  • Reverse-battery protection
• True Zero-Speed Operation
• True Power-On State
• Single-chip Sensing IC for High Reliability
• Optimized Magnetic Circuit
• Wide Operating Voltage Range
• Internal Regulator

Description

The ATS635LSE and ATS636LSE programmable, true power-on state TPOS), sensors are an optimized Hall-effect IC and magnet combination that switch in response to magnetic signals created by ferrous targets in gear-tooth sensing and proximity applications.

The devices are externally programmable. A wide range of programmability is available on the magnetic operate point (BOP) while the hysteresis remains fixed. This advanced feature allows for optimization of the sensor switch point and can drastically reduce the effects of mechanical placement tolerances found in production environments.

A proprietary dynamic offset cancellation technique, with an internal high-frequency clock, reduces the residual offset voltage, which is normally caused by device overmolding, temperature dependencies, and thermal stress. Having the Hall element and amplifier in a single chip minimizes many problems normally associated with low-level analog signals.

This sensor system is ideal for use in gathering speed or position information using gear-tooth-based configurations, or for proximity sensing with ferrous targets.

The ATS635LSE switches HIGH in the presence of a ferrous target or tooth and switches LOW in the presence of a target valley, window, or when the ferrous target is removed. The ATS636LSE has the opposite polarity and switches LOW in the presence of a ferrous target or tooth and switches HIGH in the presence of a target valley, window, or when the ferrous target is removed.

These devices are available in lead (Pb) free versions, with 100% matte tin leadframe plating.

Functional Block Diagram

Complete Part Numbers

Part Number	Package Type	RoHS Compliant	Part Composition/ RoHS Data	Temperature	Comments	Samples	Distributor Stock
ATS635LSETN-T	4-lead module	Yes	view data	-40 °C to  150 °C		Due to warehouse relocation, samples will be unavailable until July 21, 2008. Contact your sales rep or purchase from distributor.
ATS636LSETN-T	4-lead module	Yes	view data	-40 °C to  150 °C		Due to warehouse relocation, samples will be unavailable until July 21, 2008. Contact your sales rep or purchase from distributor.

Allegro's products are not to be used in life support devices or systems, if a failure of an Allegro product can reasonably be expected to cause the failure of that life support device or system, or to affect the safety or effectiveness of that device or system.