TWO-WIRE HALL-EFFECT SWITCHES Raymond Dewey Hall-effect swit

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TWO-WIRE HALL-EFFECT SWITCHES Raymond Dewey Hall-effect swit

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TWO-WIRE HALL-EFFECT SWITCHES
Raymond Dewey
Hall-effect switches typically operated opencollector, current-sinking devices requiring only external pull-up resistor. output current voltage limits more than adequate allow easy interfacing with standard logic circuitry where logic signal levels approximately supply voltage ground. Two-wire switches often specified reduced wiring costs (especially automotive applications). interfacing, however, slightly more complicated partially because logic signals current levels. Three design considerations have addressed: minimum operating supply voltage, current-sensing resistor, comparator reference voltage. primary importance specified minimum operating supply voltage (VCC(min)). specification purposes, this voltage between supply terminal ground reference) terminal. application, voltage drop across current-sensing resistor (RS) subtracts from supply voltage must considered: VSUPPLY VCC(min) (IOUT(H)(max) where VSUPPLY required minimum supply value (including tolerances), IOUT(H) specified maximum output current maximum sense-resistor value (including tolerances).
operating supply voltage requires low-value current-sensing resistor, noise other comparator considerations suggest high-value current-sensing resistor. Therefore, specify highest value resistor that will still allow meeting minimum operating supply voltage requirement. nominal comparator reference voltage (trip point) calculated RS(IOUT(H)(min) IOUT(L)(max)). Integrated Hall-effect switches include hysteresis prevent "chattering" near switch point. Hysteresis allows clean switching sensor even presence external mechanical vibration electrical noise. Comparator hysteresis should concern except case severe noise coupling two-wire line. Two-wire switches also make diagnostics possible because there should always specified current flowing, IOUT(H) IOUT(L). current outside these narrow ranges fault. Additional comparators used report open-sensor fault IOUT(L)(min) shorted-sensor fault IOUT(H)(max)
IOUT
VCC(min)
VSUPPLY
Dwg. EH-011-3
Typical Two-Wire Application
TWO-WIRE HALL-EFFECT SWITCHES
Two-Wire Hall-Effect Switches
Partial Part Number (mA) IOUT(H) (mA) IOUT(L) (mA) (mA)
ATS640 A3161 A3163 A3260 A3361 A3362
Standard three-wire, open-collector Hall-effect switches configured two-wire operation adding appropriate pull-up resistor (RL) sensor. IOUT(L) then supply current with output (ICC(L)) IOUT(H) ICC(H) (VSUPPLY VOUT(SAT))/RL. simplification, output leakage current voltage drop across included here. value pull-up resistor will provide high IOUT(H) maximum output hysteresis. However, specified minimum operating supply voltage (VCC(min)) still concern maximum allowable output current rating must exceeded.
Allegro MicroSystems, Inc. reserves right make, from time time, such departures from detail specifications required permit improvements performance, reliability, manufacturability products. Before placing order, user cautioned verify that information being relied upon current. Allegro products authorized critical components life-support devices systems without express written approval. information included herein believed accurate reliable. However, Allegro MicroSystems, Inc. assumes responsibility use; infringement patents other rights third parties which result from use.
IOUT
VSUPPLY
Dwg. EH-011-4
Two-Wire Connection Three-Wire Device
Northeast Cutoff, 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright 2000, 2002 Allegro MicroSystems, Inc.

TWO-WIRE HALL-EFFECT SWITCHES Raymond Dewey Hall-effect swit

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