A1147EUATI ALLEGRO [Allegro MicroSystems], A1147EUATI Datasheet

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A1147EUATI

Manufacturer Part Number
A1147EUATI
Description
Low Current Ultrasensitive Two-Wire Chopper-Stabilized Unipolar Hall Effect Switches
Manufacturer
ALLEGRO [Allegro MicroSystems]
Datasheet
A1147-DS, Rev. 6
Supply Voltage, V
Reverse-Supply Voltage, V
Magnetic Flux Density, B .........................Unlimited
Power Dissipation, P
Operating Temperature
Storage Temperature, T
Ambient, T
Ambient, T
Maximum Junction, T
AB SO LUTE MAX I MUM RAT INGS
Package LH, 3-pin SOT
Package UA, 3-pin SIP
A
A
, Range E.................. –40ºC to 85ºC
, Range L................ –40ºC to 150ºC
CC
D
.......................................... 28 V
............................ Graph, p. 5
Low Current Ultrasensitive Two-Wire Chopper-Stabilized
S
.................. –65ºC to 170ºC
J(max)
RCC
........................ –18 V
........................165ºC
≈1:1
≈1:1
A1147 and A1148
The A1147 and A1148 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 tech-
nique, 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 latch-
ing, and shift selector position. Two-wire unipolar switches, such as the A1147
and A1148, 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 diagnos-
tics 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 con-
dition. These devices also feature on-chip transient protection and a Zener clamp
to protect against overvoltage conditions on the supply line.
The output currents of the A1148 switches HIGH in the presence of a south (+)
polarity magnetic field of sufficient strength, and switches LOW otherwise, as in
the presence of a weak field or a north (–) polarity field. The A1147 has an oppo-
site output: the currents switch LOW in the presence of a south-polarity magnetic
field of sufficient strength, and switch HIGH otherwise.
Both versions are offered in two package styles. The LH is a SOT-23W, miniature
low-profile package for surface-mount applications. The UA is a three-lead ultra-
mini SIP for through-hole mounting. Each package is available in a lead (Pb) free
version (suffix, –T) with 100% matte tin plated leadframe. Field-programmable
versions also available: A1180 and A1181.
Features and Benefits
Chopper stabilization
Factory programmed at end-of-line for
optimized switchpoints
Low switchpoint drift over operating
Low sensitivity to stress
temperature range
Unipolar Hall Effect Switches
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
On-chip protection
Supply transient protection
Reverse-battery protection
On-board voltage regulator
3.5 to 24 V operation

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A1147EUATI Summary of contents

Page 1

Low Current Ultrasensitive Two-Wire Chopper-Stabilized Package LH, 3-pin SOT Package UA, 3-pin SIP AB SO LUTE MAX I MUM RAT INGS Supply Voltage, V .......................................... Reverse-Supply Voltage, V ........................ –18 V RCC Magnetic Flux Density, B .........................Unlimited ...

Page 2

Low Current Ultrasensitive Two-Wire Chopper-Stabilized Unipolar Hall Effect Switches V+ VCC 0.01 uF Package LH, 3-pin SOT VCC connection 3. GND A1147-DS, Rev. 6 A1147 and A1148 Functional Block Diagram Regulator Clock/Logic Low-Pass Filter ...

Page 3

Low Current Ultrasensitive Two-Wire Chopper-Stabilized Unipolar Hall Effect Switches ELECTRICAL CHARACTERISTICS Characteristic Symbol Supply Voltage 1 2 Supply Current Reverse Supply Current Supply Zener Clamp Voltage V Supply Zener Clamp Current 3 I ZSUPPLY Output Slew Rate 4 Chopping Frequency ...

Page 4

Low Current Ultrasensitive Two-Wire Chopper-Stabilized Unipolar Hall Effect Switches Supply Current (Low) versus Ambient Temperature at Various Levels of V (A1147 and A1148 – 100 Ambient Temperature, T Operate Point versus Ambient ...

Page 5

Low Current Ultrasensitive Two-Wire Chopper-Stabilized Unipolar Hall Effect Switches THERMAL CHARACTERISTICS may require derating at maximum conditions, see application information Characteristic Package Thermal Resistance *Additional thermal information available on Allegro Web site. A1147-DS, Rev. 6 A1147 and A1148 Symbol Package ...

Page 6

Low Current Ultrasensitive Two-Wire Chopper-Stabilized Unipolar Hall Effect Switches Operation The output the A1147 device switches low after the mag- CC netic field at the Hall sensor exceeds the operate point threshold When the magnetic ...

Page 7

Low Current Ultrasensitive Two-Wire Chopper-Stabilized Unipolar Hall Effect Switches Chopper Stabilization Technique When using Hall-effect technology, a limiting factor for switchpoint accuracy is the small signal voltage developed across the Hall element. This voltage is disproportionally small relative to the ...

Page 8

Low Current Ultrasensitive Two-Wire Chopper-Stabilized Unipolar Hall Effect Switches Typical Application Circuit The A114x family of devices must be protected by an external bypass capacitor connected between the supply, VCC, BYP and the ground, GND, of the device. ...

Page 9

Low Current Ultrasensitive Two-Wire Chopper-Stabilized Unipolar Hall Effect Switches Power Derating The device must be operated below the maximum junction temperature of the device Under certain combinations of J(max) peak conditions, reliable operation may require derating sup- plied ...

Page 10

Low Current Ultrasensitive Two-Wire Chopper-Stabilized Unipolar Hall Effect Switches EMC (Electromagnetic Compatibility) Requirements A1147-DS, Rev. 6 A1147 and A1148 Device Qualification Program Contact Allegro for information. Contact your local representative for EMC results. Test Name Reference Specification ESD – Human ...

Page 11

... Tape and Reel, 3000 pieces/reel A1147ELHLT-T Yes A1147EUA – Bulk Bag, 500 pieces/bag A1147EUA-T Yes A1147EUATI – Tape and Reel, 2000 pieces/reel A1147EUATI-T Yes A1147LLHLT – Tape and Reel, 3000 pieces/reel A1147LLHLT-T Yes A1147LUA – Bulk Bag, 500 pieces/bag A1147LUA-T Yes A1147LUATI – ...

Page 12

Low Current Ultrasensitive Two-Wire Chopper-Stabilized Unipolar Hall Effect Switches 3.10 .122 2.90 .114 3 0.96 .038 NOM 2.10 .083 1.85 .073 3.00 .118 2.70 .106 1 0.50 .020 0.30 .012 0.55 .022 REF .122 .117 A1147-DS, Rev. 6 A1147 and ...

Page 13

Low Current Ultrasensitive Two-Wire Chopper-Stabilized Unipolar Hall Effect Switches A1147-DS, Rev. 6 A1147 and A1148 The products described herein are manufactured under one or more of the 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; ...

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