a1145euati-t Allegro MicroSystems, Inc., a1145euati-t Datasheet

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a1145euati-t

Manufacturer Part Number
a1145euati-t
Description
Ultrasensitive 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
A1145-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
Ultrasensitive Two-Wire Chopper-Stabilized
Functional Block Diagram
Clock/Logic
Amp
Low-Pass
Filter
Unipolar Hall Effect Switches
Description
The A1145 and A1146 devices are two-wire, unipolar, Hall
effect switches that are factory-programmed at end-of-line to
optimize ultrasensitive 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 A1145
and A1146, 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. These devices also
Continued on the next page…
Regulator
To All Subcircuits
Package UA Only
GND
A1145 and A1146
GND

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a1145euati-t Summary of contents

Page 1

Ultrasensitive Two-Wire Chopper-Stabilized 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 ...

Page 2

... Pb-Free A1145ELHLT-T Yes Tape and Reel, 3000 pieces/reel A1145EUA-T Yes Bulk Bag, 500 pieces/bag A1145EUATI – Tape and Reel, 2000 pieces/reel A1145EUATI-T Yes A1145LLHLT-T Yes Tape and Reel, 3000 pieces/reel A1145LUA-T Yes Bulk Bag, 500 pieces/bag A1145LUATI – Tape and Reel, 2000 pieces/reel ...

Page 3

... CC Min. Typ.* Max 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 – Units ...

Page 4

... Ambient Temperature, T (° Various Levels (A1145 and A1146 – 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 4 ...

Page 5

... 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 5 ...

Page 6

... The A1146 device switches with opposite polarity for similar B in comparison to the A1145 (see figure 1). I CC(H) I CC(L) B+ and CC(H) I CC(L) 0 B– HYS (B) A1146 Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com values, 6 ...

Page 7

... 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 7 ...

Page 8

... 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 8 ...

Page 9

... 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) 9 ...

Page 10

... Conducted Transients ISO 7637-2 Direct RF Injection ISO 11452-7 Bulk Current Injection ISO 11452-4 TEM Cell ISO 11452-3 Pin-out Drawings Package UA, 3-pin SIP 1. VCC 2. GND GND Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com 10 ...

Page 11

... 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 11 ...

Page 12

... 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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