Sensitive Two-Wire Chopper-Stabilized Unipolar Hall Effect Switches

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Sensitive Two-Wire Chopper-Stabilized Unipolar Hall Effect Switches

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A1140/41/42/43
Sensitive Two-Wire Chopper-Stabilized Unipolar Hall Effect Switches
A1140, A1141, A1142, A1143 devices sensitive, two-wire, unipolar, Hall effect switches that factory-programmed end-of-line optimize magnetic switchpoint accuracy. These devices patented high frequency chopper-stabilization technique, produced using Allegro advanced BiCMOS wafer fabrication process, achieve magnetic stability eliminate offset inherent single-element devices exposed harsh application environments.
Package 3-pin
Package 3-pin
Commonly found number automotive applications, these switches utilized sense seat track position, seat belt buckle presence, hood/trunk latching, shift selector position. Two-wire unipolar switches, such A1140/41/42/43 family, particularly advantageous price-sensitive applications because they require less wire operation than switches with more traditional open-collector output. Additionally, system designer inherently gains diagnostics because there always output current flowing, which should either narrow ranges. current level within these ranges indicates fault condition. A1140/41/42/43 family switches also features on-chip transient protection Zener clamp protect against overvoltage conditions supply line. output currents A1141 A1143 switch HIGH presence south polarity magnetic field sufficient strength, switch otherwise, presence weak field north polarity field. other devices family (A1140 A1142) have opposite output: currents switch presence south-polarity magnetic field sufficient strength, switch HIGH otherwise. other differences switches their defined current levels magnetic switchpoints. versions offered package styles. SOT-23W, miniature low-profile package surface-mount applications. three-lead ultramini through-hole mounting. Each package available lead (Pb) free version (suffix, with 100% matte plated leadframe. Field-programmable versions also available: A1180, A1181, A1182, A1183.
ABSOLUTE MAXIMUM RATINGS
Supply Voltage, Reverse-Supply Voltage, VRCC Magnetic Flux Density, .Unlimited Power Dissipation, Graph, Operating Temperature Ambient, Range Ambient, Range Maximum Junction, Storage Temperature,
Features Benefits
Chopper stabilization switchpoint drift over operating temperature range sensitivity stress Factory programmed end-of-line optimized switchpoints On-chip protection Supply transient protection Reverse-battery protection On-board voltage regulator operation
A1140-DS, Rev.
Allegro MicroSystems, Inc. Northeast Cutoff, 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com
A1140/41/42/43
Sensitive Two-Wire Chopper-Stabilized Unipolar Hall Effect Switches
Functional Block Diagram
Regulator
Subcircuits Clock/Logic 0.01 Sample Hold Dynamic Offset Cancellation Low-Pass Filter
Package Only
Package 3-pin
Package 3-pin
connection
A1140-DS, Rev.
Allegro MicroSystems, Inc. Northeast Cutoff, 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com
A1140/41/42/43
Sensitive Two-Wire Chopper-Stabilized Unipolar Hall Effect Switches
ELECTRICAL CHARACTERISTICS over operating voltage temperature ranges, unless otherwise specified
Characteristic Supply Voltage1 Symbol ICC(L) Supply Current ICC(H) Reverse Supply Current Supply Zener Clamp Voltage Supply Zener Clamp Current3 Output Slew Rate4 Chopping Frequency Power-On Time5 Power-On State6,7
represents 2Relative values
Test Conditions
Min.
Typ. HIGH
Max. -1.6
Units mA/µs
B>BOP A1140; B<BRP A1141 B>BOP A1142; B<BRP A1143 B>BOP A1141, A1143 B<BRP A1140, A1142 VRCC ICCL(max) 25°C VZSUPPLY Capacitance oscilloscope performing measurement
IRCC VZSUPPLY IZSUPPLY di/dt
CBYPASS 0.01
ton; slew rate mV/µs
generated voltage between pin. algebraic convention, where positive values indicate south magnetic polarity, negative values indicate north magnetic polarity; therefore greater values indicate stronger south polarity field weaker north polarity field, present). ZSUPPLY(max) ICCL(max) 4Measured without bypass capacitor between GND. bypass capacitor results slower current change. 5Measured with without bypass capacitor 0.01 Adding larger bypass capacitor causes longer Power-On Time. 6POS defined true only with slew rate greater. Operation with slew rate less than permanently harm device performance. 7POS undefined
MAGNETIC CHARACTERISTICS over operating voltage temperature ranges, unless otherwise specified
Characteristic Operate Point Symbol Test Conditions A1140, A1142 ICCL A1141, A1143 ICCH A1140, A1142 ICCH A1141, A1143 ICCL BHYS Min. Typ.* Max. Units
Release Point Hysteresis
*Typical data taken
BHYS
A1140-DS, Rev.
Allegro MicroSystems, Inc. Northeast Cutoff, 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com
A1140/41/42/43
Sensitive Two-Wire Chopper-Stabilized Unipolar Hall Effect Switches Characteristic Data
Supply Current (Low) versus Ambient Temperature Various Levels (A1140 A1141)
Supply Current (Low) versus Ambient Temperature Various Levels (A1142 A1143)
ICCL (mA) 12.0 24.0 ICCL (mA)
12.0 24.0
Ambient Temperature, (°C)
Ambient Temperature, (°C)
Supply Current (High) versus Ambient Temperature Various Levels (A1140, A1141, A1142, A1143)
ICCH (mA)
12.0 24.0
Ambient Temperature, (°C)
Operate Point versus Ambient Temperature Various Levels (A1140, A1141, A1142, A1143)
Switchpoint Hysteresis versus Ambient Temperature Various Levels (A1140, A1141, A1142, A1143)
BHYS 12.0 24.0
12.0 24.0
Ambient Temperature, (°C)
Ambient Temperature, (°C)
A1140-DS, Rev.
Allegro MicroSystems, Inc. Northeast Cutoff, 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com
A1140/41/42/43
Sensitive Two-Wire Chopper-Stabilized Unipolar Hall Effect Switches
THERMAL CHARACTERISTICS require derating maximum conditions, application information
Characteristic Symbol Test Conditions Package minimum-K (single layer, single-sided with copper limited solder pads) Package low-K (single layer, double-sided with 0.926 copper area) Package minimum-K (single layer, single-sided with copper limited solder pads) Value Units
Package Thermal Resistance
Power Derating Curve TJ(max) ICC(max)
VCC(max)
Maximum Allowable
Low-K PCB, Package (RJA Minimum-K PCB, Package (RJA Minimum-K PCB, Package (RJA
VCC(min)
Power Dissipation versus Ambient Temperature
1900 1800 1700 1600 1500 1400 1300 1200 1100 1000
Power Dissipation,
imum ckag
Temperature (°C)
A1140-DS, Rev.
Allegro MicroSystems, Inc. Northeast Cutoff, 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com
A1140/41/42/43
Sensitive Two-Wire Chopper-Stabilized Unipolar Hall Effect Switches
Functional Description
Operation output, ICC, A1140 A1142 devices switch after magnetic field Hall sensor exceeds operate point threshold, BOP. When magnetic field reduced below release point threshold, BRP, device output goes high. differences between magnetic operate release point called hysteresis device, BHYS. This builtin hysteresis allows clean switching output even presence external mechanical vibration electrical noise. A1141 A1143 devices switch with opposite polarity similar values, comparison A1140 A1142 (see figure
ICC(H)
ICC(H)
Switch High
ICC(L)
Switch High
Switch
Switch
ICC(L)
BHYS
BHYS
A1140, A1142
A1141, A1143
Figure Alternative switching behaviors available A114x device family. horizontal axis, direction indicates increasing south polarity magnetic field strength, direction indicates decreasing south polarity field strength (including case increasing north polarity).
A1140-DS, Rev.
Allegro MicroSystems, Inc. Northeast Cutoff, 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com
A1140/41/42/43
Sensitive Two-Wire Chopper-Stabilized Unipolar Hall Effect Switches
Chopper Stabilization Technique When using Hall-effect technology, limiting factor switchpoint accuracy small signal voltage developed across Hall element. This voltage disproportionally small relative offset that produced output Hall sensor. This makes difficult process signal while maintaining accurate, reliable output over specified operating temperature voltage ranges. Chopper stabilization unique approach used minimize Hall offset chip. patented Allegro technique, namely Dynamic Quadrature Offset Cancellation, removes sources output drift induced thermal mechanical stresses. This offset reduction technique based signal modulationdemodulation process. undesired offset signal separated from magnetic field-induced signal frequency domain, through modulation. subsequent demodulation acts modulation process offset, causing magnetic fieldinduced signal recover original spectrum baseband, while offset becomes high-frequency signal. magneticsourced signal then pass through low-pass filter, while modulated offset suppressed. This configuration illustrated figure
chopper stabilization technique uses high frequency clock. demodulation process, sample hold technique used, where sampling performed twice chopper frequency (400 kHz). This high-frequency operation allows greater sampling rate, which results higher accuracy faster signal-processing capability. This approach desensitizes chip effects thermal mechanical stresses, produces devices that have extremely stable quiescent Hall output voltages precise recoverability after temperature cycling. This technique made possible through BiCMOS process, which allows low-offset, low-noise amplifiers combination with high-density logic integration sample-and-hold circuits. repeatability magnetic field-induced switching affected slightly chopper technique. However, Allegro highfrequency chopping approach minimizes affect jitter makes imperceptible most applications. Applications that more likely sensitive such degradation those requiring precise sensing alternating magnetic fields; example, speed sensing ring-magnet targets. such applications, Allegro recommends digital sensor families with lower sensitivity jitter. more information those devices, contact your Allegro sales representative.
Regulator
Clock/Logic Hall Element Low-Pass Filter
Figure Chopper stabilization circuit (Dynamic Quadrature Offset Cancellation)
Sample Hold
A1140-DS, Rev.
Allegro MicroSystems, Inc. Northeast Cutoff, 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com
A1140/41/42/43
Sensitive Two-Wire Chopper-Stabilized Unipolar Hall Effect Switches
Application Information
Typical Application Circuit A114x family devices must protected external bypass capacitor, CBYP, connected between supply, VCC, ground, GND, device. CBYP reduces both external noise noise generated chopper-stabilization function. shown figure 0.01 capacitor typical. Installation CBYP must ensure that traces that connect A114x pins greater than length. high-frequency interferences conducted along supply lines passed directly load through CBYP, serves only protect A114x internal circuitry. result, load (electronic control unit) must have sufficient protection, other than CBYP, installed parallel with A114x. series resistor supply side, (not shown), combination with CBYP, creates filter pulses. When determining minimum requirement A114x device, voltage drops across sense resistor, RSENSE, must taken into consideration. typical value RSENSE approximately
Package Only Maximum separation
A114x
CBYP 0.01
RSENSE
Figure Typical application circuit
additional general application information, visit Allegro site www. allegromicro.com.
A1140-DS, Rev.
Allegro MicroSystems, Inc. Northeast Cutoff, 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com
A1140/41/42/43
Sensitive Two-Wire Chopper-Stabilized Unipolar Hall Effect Switches
Power Derating device must operated below maximum junction temperature device, TJ(max). Under certain combinations peak conditions, reliable operation require derating supplied power improving heat dissipation properties application. This section presents procedure correlating factors affecting operating (Thermal data also available Allegro MicroSystems site.) Package Thermal Resistance, RJA, figure merit summarizing ability application device dissipate heat from junction (die), through paths ambient air. primary component Effective Thermal Conductivity, printed circuit board, including adjacent devices traces. Radiation from through device case, RJC, relatively small component RJA. Ambient temperature, motion significant external factors, damped overmolding. effect varying power levels (Power Dissipation, PD), estimated. following formulas represent fundamental relationships used estimate Example: Reliability 150°C, package using minimum-K PCB. Observe worst-case ratings device, specifically: 165°C/W, TJ(max) 165°C, VCC(max) ICC(max) Calculate maximum allowable power level, PD(max). First, invert equation Tmax TJ(max) This provides allowable increase resulting from internal power dissipation. Then, invert equation PD(max) Tmax 15°C °C/W Finally, invert equation with respect voltage: VCC(est) PD(max) ICC(max) result indicates that, application device dissipate adequate amounts heat voltages VCC(est). Compare VCC(est) VCC(max). VCC(est) VCC(max), then reliable operation between VCC(est) VCC(max) requires enhanced RJA. VCC(est) VCC(max), then operation between VCC(est) VCC(max) reliable under these conditions.
example, given common conditions such 25°C, °C/W, then: °C/W 25°C 32°C worst-case estimate, PD(max), represents maximum allowable power level (VCC(max), ICC(max)), without exceeding TJ(max), selected
A1140-DS, Rev.
Allegro MicroSystems, Inc. Northeast Cutoff, 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com
A1140/41/42/43
Sensitive Two-Wire Chopper-Stabilized Unipolar Hall Effect Switches
Device Qualification Program
Contact Allegro information.
(Electromagnetic Compatibility) Requirements
Contact your local representative results.
Test Name Human Body Model Machine Model Conducted Transients Direct Injection Bulk Current Injection Cell Reference Specification AEC-Q100-002 AEC-Q100-003 7637-1 11452-7 11452-4 11452-3
A1140-DS, Rev.
Allegro MicroSystems, Inc. Northeast Cutoff, 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com
A1140/41/42/43
Sensitive Two-Wire Chopper-Stabilized Unipolar Hall Effect Switches
Product Selection Guide
complete part numbers when ordering
Part Number A1140ELHLT A1140ELHLT-T A1140EUA A1140EUA-T A1140EUATI A1140EUATI-T A1140LLHLT A1140LLHLT-T A1140LUA A1140LUA-T A1140LUATI A1140LUATI-T A1141ELHLT A1141ELHLT-T A1141EUA A1141EUA-T A1141EUATI A1141EUATI-T A1141LLHLT A1141LLHLT-T A1141LUA A1141LUA-T A1141LUATI A1141LUATI-T Pb-Free Packinga Tape Reel, 3000 pieces/reel Bulk Bag, pieces/bag Through Hole Tape Reel, 2000 pieces/reel Tape Reel, 3000 pieces/reel Bulk Bag, pieces/bag Through Hole Tape Reel, 2000 pieces/reel Tape Reel, 3000 pieces/reel Bulk Bag, pieces/bag Through Hole Tape Reel, 2000 pieces/reel High Tape Reel, 3000 pieces/reel Bulk Bag, pieces/bag Through Hole Tape Reel, 2000 pieces/reel Surface Mount Surface Mount Surface Mount Package Surface Mount Operating Ambient Temperature, (°C) Output Level South Fieldb Supply Current Output, ICC(L) (mA)
Continued next page.
A1140-DS, Rev.
Allegro MicroSystems, Inc. Northeast Cutoff, 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com
A1140/41/42/43
Sensitive Two-Wire Chopper-Stabilized Unipolar Hall Effect Switches
Continued from previous page.
Part Number A1142ELHLT A1142ELHLT-T A1142EUA A1142EUA-T A1142EUATI A1142EUATI-T A1142LLHLT A1142LLHLT-T A1142LUA A1142LUA-T A1142LUATI A1142LUATI-T A1143ELHLT A1143ELHLT-T A1143EUA A1143EUA-T A1143EUATI A1143EUATI-T A1143LLHLT A1143LLHLT-T A1143LUA A1143LUA-T A1143LUATI A1143LUATI-T
aContact Allegro bSouth
Pb-Free
Packinga Tape Reel, 3000 pieces/reel Bulk Bag, pieces/bag
Package Surface Mount
Operating Ambient Temperature, (°C)
Output Level South Fieldb
Supply Current Output, ICC(L) (mA)
Through Hole
Tape Reel, 2000 pieces/reel Tape Reel, 3000 pieces/reel Bulk Bag, pieces/bag Through Hole Tape Reel, 2000 pieces/reel Tape Reel, 3000 pieces/reel Bulk Bag, pieces/bag Through Hole Tape Reel, 2000 pieces/reel High Tape Reel, 3000 pieces/reel Bulk Bag, pieces/bag Through Hole Tape Reel, 2000 pieces/reel Surface Mount Surface Mount Surface Mount
additional packing options. magnetic fields must sufficient strength.
A1140-DS, Rev.
Allegro MicroSystems, Inc. Northeast Cutoff, 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com
A1140/41/42/43
Sensitive Two-Wire Chopper-Stabilized Unipolar Hall Effect Switches Package 3-Pin; (SOT-23W)
3.10 .122 2.90 .114 1.49 .059 0.28 .011 0.20 .008 0.13 .005
0.70 .028
0.96 .038 2.10 .083 1.85 .073 3.00 .118 2.70 .106 2.40 .094 0.25 .010 1.00 .039 0.25 .010 Seating Plane Gauge Plane
0.95 .037 Dimensions millimeters U.S. Customary dimensions (in.) brackets, reference only Hall element Active Area Depth 0.28 [.011] Fits SC-59A Solder Layout
0.50 .020 0.30 .012 0.55 .022
1.13 .045 0.87 .034 0.95 .037 0.15 .006 0.00 .000
Package 3-Pin
.164 4.17 .159 4.04 .0195 0.50 .0805 2.04 .0565 1.44
.062 1.57 .058 1.47
.122 3.10 .117 2.97
.085 2.16
.031 0.79
.640 16.26 .600 15.24
.017 0.44 .014 0.35
.019 0.48 .014 0.36 .050 1.27 Dimensions inches Metric dimensions (mm) brackets, reference only Dambar removal protrusion
Hall element
A1140-DS, Rev.
Allegro MicroSystems, Inc. Northeast Cutoff, 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com
A1140/41/42/43
Sensitive Two-Wire Chopper-Stabilized Unipolar Hall Effect Switches
products described herein manufactured under more following U.S. patents: 5,045,920; 5,264,783; 5,442,283; 5,389,889; 5,581,179; 5,517,112; 5,619,137; 5,621,319; 5,650,719; 5,686,894; 5,694,038; 5,729,130; 5,917,320; other patents pending. 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. Copyright 2004, 2005 Allegro MicroSystems, Inc.
A1140-DS, Rev.
Allegro MicroSystems, Inc. Northeast Cutoff, 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com

Sensitive Two-Wire Chopper-Stabilized Unipolar Hall Effect Switches

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