ATS635| Datasheet

ATS635, ATS636

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ATS635LSE and ATS636LSE
Programmable Back Biased Hall-Effect Switch with TPOS Functionality
PACKAGE DIAGRAM
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 informati
on 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 lead available in lead (Pb) matte tin leadframe100% These devices are (Pb) free, with 100% free versions, with plating. matte tin leadframe plating.

Pin 1 = VCC Pin 2 = VOUT Pin 3 = No Connect Pin 4 = GND

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

ABSOLUTE MAXIMUM RATINGS
Supply Voltage, VCC .............................. 28 V* Reverse Supply Voltage, VRCC ............... -18 V Overvoltage Supply Current, ICC ...........100 mA Output Off Voltage, VOUT........................ 26.5V Output Sink Current, IOUT................... 20 mA Magnetic Flux Density, B............... Unlimited Package Power Dissipation, PD ..... See Graph Operating Temperature Range, TA Suffix "L"....................... -40 C to +150 C Junction Temperature, TJ ......................165 C Storage Temperature Range TS .............................. -65 C to +170 C
*Fault conditions that produce supply voltage transients will be clamped by an internal Zener diode. These conditions can be tolerated but should be avoided. Internal current limiting is intended to protect the device from output short circuits, but is not intended for continuous operation.

Part Number ATS635LSETN-T ATS636LSETN-T
1Pb-based

Pb-Free1 Yes Yes

Output (Tooth) High Low

Packing2 13-in. reel, 450 pieces/reel 13-in. reel, 450 pieces/reel

variants are being phased out of the product line. The variants cited in this footnote are in production but have been determined to be NOT FOR NEW DESIGN. This classification indicates that sale of this device is currently restricted to existing customer applications. The variants should not be purchased for new design applications because obsolescence in the near future is probable. Samples are no longer available. Status change: May 1, 2006. These variants include: ATS635LSETN and ATS635LSETN. 2Contact Allegro for additional packing options.

635LSE-DS, Rev. 1

Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com