a1140euati-t Allegro MicroSystems, Inc., a1140euati-t Datasheet

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a1140euati-t

Manufacturer Part Number
a1140euati-t
Description
Sensitive Two-wire Chopper-stabilized Unipolar Hall Effect Switches
Manufacturer
Allegro MicroSystems, Inc.
Datasheet
Features and Benefits
▪ Chopper stabilization
▪ Factory programmed at end-of-line for optimized
▪ On-chip protection
Packages: 3 pin SOT23W (suffix LH), and
3 pin SIP (suffix UA)
Not to scale
A1140-DS, Rev. 8
switchpoints
▫ Low switchpoint drift over operating
▫ Low sensitivity to stress
▫ Supply transient protection
▫ Reverse-battery protection
▫ On-board voltage regulator
▫ 3.5 to 24 V operation
temperature range
V+
0.01 uF
VCC
Functional Block Diagram
Sensitive Two-Wire Chopper-Stabilized
Clock/Logic
Amp
Low-Pass
Filter
Unipolar Hall Effect Switches
Description
The A1140, A1141, A1142, and A1143 devices are sensitive,
two-wire, unipolar, Hall effect switches that are factory-
programmed at end-of-line to optimize magnetic switchpoint
accuracy. These devices use a patented high frequency chopper-
stabilization technique, produced using the Allegro advanced
BiCMOS wafer fabrication process, to achieve magnetic
stability and to eliminate offset inherent in single-element
devices exposed to harsh application environments.
Commonly found in a number of automotive applications,
these switches are utilized to sense seat track position,
seat belt buckle presence, hood/trunk latching, and shift
selector position. Two-wire unipolar switches, such as the
A1140/41/42/43 family, are particularly advantageous in
price-sensitive applications because they require one less
wire for operation than do switches with the more traditional
open-collector output. Additionally, the system designer
inherently gains diagnostics because there is always output
current flowing, which should be in either of two narrow
ranges. Any current level not within these ranges indicates a
fault condition. The A1140/41/42/43 family of switches also
Continued on the next page…
A1140, A1141, A1142, and A1143
Regulator
To All Subcircuits
Package UA Only
GND
GND

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a1140euati-t Summary of contents

Page 1

Features and Benefits ▪ Chopper stabilization ▫ Low switchpoint drift over operating temperature range ▫ Low sensitivity to stress ▪ Factory programmed at end-of-line for optimized switchpoints ▪ On-chip protection ▫ Supply transient protection ▫ Reverse-battery protection ▫ On-board voltage ...

Page 2

... Range L T (max stg 1. VCC 2. GND 3. GND Rating Units 28 V –18 V Unlimited G – ºC –40 to 150 ºC 165 ºC –65 to 170 ºC Package UA, 3-pin SIP Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com 2 ...

Page 3

... A1140, A1141, A1142, and A1143 1 Part Number Pb-Free A1140EUATI-T 4 Yes Tape and Reel, 2000 pieces/reel A1140LUATI-T 4 Yes Tape and Reel, 2000 pieces/reel A1141EUATI-T 4 Yes Tape and Reel, 2000 pieces/reel A1141LUATI-T 4 Yes Tape and Reel, 2000 pieces/reel A1142ELHLT-T Yes Tape and Reel, 3000 pieces/reel ...

Page 4

... CC Min. Typ.* Max 110 45 65 105 25°C and V A Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com Units mA/μs kHz μs – ...

Page 5

... Ambient Temperature, T (° 3.5 V 12.0 V 24.0 V 150 200 at Various Levels (A1140, A1141, A1142, and A1143 100 150 Ambient Temperature, T (°C) A Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com V CC 3.5 V 12.0 V 24.0 V 200 V CC 3.5 V 12.0 V 24.0 V 200 5 ...

Page 6

... Temperature (° copper area each side V CC(max) V CC(min) 140 160 180 140 160 180 Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com Value Units 228 ºC/W 110 ºC/W 165 ºC/W 6 ...

Page 7

... The A1141 and A1143 devices switch with opposite polarity for , the device output goes similar B A1142 (see figure 1). . This built- HYS I CC(H) I CC(L) B+ and B values, in comparison to the A1140 and B– HYS (B) A1141, A1143 Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com I CC(H) I CC(L) 7 ...

Page 8

... For such applica- tions, Allegro recommends its digital sensor families with lower sensitivity to jitter. For more information on those devices, contact your Allegro sales representative. Regulator Clock/Logic Amp Low-Pass Filter Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com 8 ...

Page 9

... BYP , and it serves BYP requirement of the A114x V+ VCC B A114x C BYP 0.01 μF GND GND Package UA Only B Maximum separation SENSE ECU Figure 3. Typical application circuit Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com 9 ...

Page 10

... V CC(est) CC(max) CC(est) CC(max) and V requires enhanced CC(est) CC(max) ≥ then operation between V CC(est) CC(max) is reliable under these conditions. Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com . First, D(max) . CC(est) , then reli- and CC(est) 10 ...

Page 11

... ESD – Human Body Model AEC-Q100-002 ESD – Machine Model AEC-Q100-003 Conducted Transients ISO 7637-2 Direct RF Injection ISO 11452-7 Bulk Current Injection ISO 11452-4 TEM Cell ISO 11452-3 11 Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com ...

Page 12

... 0.95 .037 1.90 .075 A 8º 0º 0.20 .008 0.08 .003 2.10 .083 1.85 .073 0.96 .038 0.60 .024 A NOM 0.25 .010 0.25 .010 C SEATING PLANE SEATING PLANE GAUGE PLANE 1.17 .046 0.75 .030 0.15 .006 0.00 .000 Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com 12 ...

Page 13

... Allegro products are not authorized for use as critical components in life-support devices or sys tems without express written approval. The in for ma tion in clud ed herein is believed rate and reliable. How ev er, Allegro MicroSystems, Inc. assumes no re spon si bil i ty for its use; nor for any in fringe ment of patents or other rights of third parties which may result from its use. ...

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