Programmable Back Biased Hall-Effect

Switch with TPOS Functionality

PACKAGE DIAGRAM

Pin 1 = VCC

Pin2=VOUT

Pin3=NoConnect

Pin 4 = GND

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

hysteresis remains fixed. This advanced feature allows for optimization of

the sensor switch point and can drastically reduce the effects of

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.

ABSOLUTE MAXIMUM RATINGS

†

Magnetic Flux Density, B…………… Unlimited

Suffix “L”………...……….. -40°Cto+150°C

Storage Temperature Range

*Fault conditions that produce supply voltage transients will

be clamped by an internal Zener diode. These conditions

can be tolerated but should be avoided.

from output short circuits, but is not intended for continuous

operation.

FEATURES

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

These devices are available in lead (Pb) free versions, with 100%

matte tin leadframe plating.

ATS635LSE and ATS636LSE

ATS635LSE-DS

Worcester, Massachusetts 01615-0036 (508) 853-5000

115 Northeast Cutoff, Box 15036

www.allegromicro.com

Allegro MicroSystems, Inc.

Use the following complete part numbers when ordering:

Part Number

Pb-Free

Output

(Tooth)

Packing*

ATS635LSETN-T

Yes

High

13-in. reel, 450 pieces/reel

ATS636LSETN-T

Yes

Low

13-in. reel, 450 pieces/reel

*Contact Allegro for additional packing options.