A1180EUA-T ALLEGRO [Allegro MicroSystems], A1180EUA-T Datasheet

A1180EUA-T

Manufacturer Part Number

A1180EUA-T

Description

Sensitive Two-Wire Field-Programmable Chopper-Stabilized Unipolar Hall-Effect Switches

Manufacturer

ALLEGRO [Allegro MicroSystems]

Datasheet

1.A1180EUA-T.pdf (16 pages)

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A1180-DS, Rev. 2

Supply Voltage, V

Reverse-Supply Voltage, V

Magnetic Flux Density, B .........................Unlimited

Operating Temperature

Storage Temperature, T

1. VCC

2. No connection

3. GND

Ambient, T

Maximum Junction, T

AB SO LUTE MAX I MUM RAT INGS

1. VCC

2. GND

3. GND

Package LH, 3-pin SOT

Package UA, 3-pin SIP

Sensitive Two-Wire Field-Programmable Chopper-Stabilized

, Range E.................. –40ºC to 85ºC

, Range L................ –40ºC to 150ºC

.......................................... 28 V

.................. –65ºC to 170ºC

J(max)

RCC

........................ –18 V

........................165ºC

A1180/81/82/83

The A1180, A1181, A1182, and A1183 devices are sensitive, two-wire, unipolar,

Hall effect switches. The operate point, B

packaging of the sensor and placement into the application. This advanced feature

allows the optimization of the sensor switching performance, by effectively

accounting for variations caused by mounting tolerances for the device and the

target magnet.

This family of devices are produced on the Allegro MicroSystems advanced

BiCMOS wafer fabrication process, which implements a patented, high-frequency,

chopper-stabilization technique that achieves magnetic stability and eliminates

the offsets that are inherent in single-element devices exposed to harsh applica-

tion environments. Commonly found in a number of automotive applications,

the A1180-83 family of devices are utilized to sense: seat track position, seat belt

buckle presence, hood/trunk latching, and shift selector position.

Two-wire unipolar switches are particularly advantageous in price-sensitive appli-

cations, because they require one less wire than the more traditional open-collec-

tor output switches. Additionally, the system designer gains inherent diagnostics

because output current normally ﬂ ows in either of two narrowly-speciﬁ ed ranges.

Any output current level outside of these two ranges is a fault condition. The

A1180-83 family of devices also features on-chip transient protection, and a Zener

clamp to protect against overvoltage conditions on the supply line.

The output currents of the A1181 and A1183 switch

polarity magnetic ﬁ eld of sufﬁ cient strength; and switch

when there is no signiﬁ cant magnetic ﬁ eld present. The A1180 and A1182 have

inverted output current levels: switching

magnetic ﬁ eld of sufﬁ cient strength, and

their speciﬁ ed

Both devices are offered in two package styles: LH, a SOT-23W miniature low-

proﬁ le package for surface-mount applications, and UA, a three-lead ultramini

Single Inline Package (SIP) for through-hole mounting. Each package is available

in a lead (Pb) free version (sufﬁ x, –T) with 100% matte tin plated leadframe.

Factory-programmed versions are also available. Refer to: A1140, A1141, A1142,

A1143, A1145, and A1146.

Features and Beneﬁ ts

Low switchpoint drift over operating

Low stress sensitivity

Chopper stabilization

temperature range

Field-programmable for optimized

switchpoints

LOW

current supply levels.

Unipolar Hall-Effect Switches

LOW

HIGH

, can be ﬁ eld-programmed, after ﬁ nal

Allegro MicroSystems, Inc.

115 Northeast Cutoff, Box 15036

Worcester, Massachusetts 01615-0036 (508) 853-5000

www.allegromicro.com

in the presence of a south polarity

otherwise. The devices also differ in

Supply transient protection

Reverse-battery protection

On-board voltage regulator

3.5 V to 24 V operation

On-chip protection

HIGH

LOW

in the presence of a south

otherwise, including

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A1180EUA-T Summary of contents

Page 1

Sensitive Two-Wire Field-Programmable Chopper-Stabilized Package LH, 3-pin SOT 3 1. VCC 2. No connection 3. GND NC 1 Package UA, 3-pin SIP 1. VCC 2. GND 3. GND LUTE MAX I MUM RAT INGS Supply ...

... Sensitive Two-Wire Field-Programmable Chopper-Stabilized Unipolar Hall Effect Switches Pb- Part Number Packing free A1180ELHLT – 7-in. reel, 3000 pieces/reel A1180ELHLT-T Yes A1180EUA – Bulk, 500 pieces/bag A1180EUA-T Yes A1180LLHLT – 7-in. reel, 3000 pieces/reel A1180LLHLT-T Yes A1180LUA – Bulk, 500 pieces/bag A1180LUA-T Yes A1181ELHLT – ...

Page 3

Sensitive Two-Wire Field-Programmable Chopper-Stabilized Unipolar Hall Effect Switches V+ VCC 0.01 uF A1180-DS, Rev. 2 A1180/81/82/83 Functional Block Diagram Program/Lock Programming Offset Logic Clock/Logic Low-Pass Filter Amp Regulator GND GND Package UA Only Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box ...

Page 4

Sensitive Two-Wire Field-Programmable Chopper-Stabilized Unipolar Hall Effect Switches ELECTRICAL CHARACTERISTICS Characteristic Symbol Supply Voltage 1 2 Supply Current Supply Zener Clamp Voltage V Supply Zener Clamp Current I Reverse Supply Current Output Slew Rate 3 Chopping Frequency 4 Power-On Time ...

Page 5

Sensitive Two-Wire Field-Programmable Chopper-Stabilized Unipolar Hall Effect Switches I versus Ambient Temperature CC(L) at Various Levels of V (A1180, A1181 - 100 Ambient Temperature, T Average B Bits versus Ambient Temperature OP ...

Page 6

Sensitive Two-Wire Field-Programmable Chopper-Stabilized Unipolar Hall Effect Switches EMC (Electromagnetic Compatibility) Requirements A1180-DS, Rev. 2 A1180/81/82/83 Device Qualiﬁ cation Program Contact Allegro for information. Contact your local representative for EMC results. Test Name Reference Speciﬁ cation ESD – Human Body ...

Page 7

Sensitive Two-Wire Field-Programmable 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. A1180-DS, Rev. 2 A1180/81/82/83 Symbol Package LH, 1-layer PCB ...

Page 8

Sensitive Two-Wire Field-Programmable Chopper-Stabilized Unipolar Hall Effect Switches Operation The output the A1180 and A1182 devices switch low CC after the magnetic ﬁ eld at the Hall sensor exceeds the oper- ate point threshold When ...

Page 9

Sensitive Two-Wire Field-Programmable Chopper-Stabilized Unipolar Hall Effect Switches Chopper Stabilization Technique A limiting factor for switchpoint accuracy when using Hall effect technology is the small signal voltage developed across the Hall element. This voltage is proportionally small relative to the ...

Page 10

Sensitive Two-Wire Field-Programmable Chopper-Stabilized Unipolar Hall Effect Switches For additional general application information, visit the Allegro MicroSystems Web site at www. allegromicro.com. Typical Application Circuit The A118x family of devices must be protected by an external bypass capacitor ...

Page 11

Sensitive Two-Wire Field-Programmable 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 power ...

Page 12

Sensitive Two-Wire Field-Programmable Chopper-Stabilized Unipolar Hall Effect Switches Programming Protocol The operate switchpoint can be ﬁ eld-programmed so, a coded series of voltage pulses through the VCC pin is used to set bitﬁ elds in ...

Page 13

Sensitive Two-Wire Field-Programmable Chopper-Stabilized Unipolar Hall Effect Switches The pulse sequences consist of the following groups of pulses enable sequence bitﬁ eld address sequence. 3. When permanently setting the bitﬁ eld, a long V ing pulse. ...

Page 14

Sensitive Two-Wire Field-Programmable Chopper-Stabilized Unipolar Hall Effect Switches The ﬁ rst segment of code is a Enabling Addressing Mode. keying sequence used to enable the bitﬁ eld addressing mode. As shown in ﬁ gure 7, this segment consists of one ...

Page 15

Sensitive Two-Wire Field-Programmable 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 A1180-DS, Rev. 2 A1180/81/82/83 Package LH, ...

Page 16

Sensitive Two-Wire Field-Programmable Chopper-Stabilized Unipolar Hall Effect Switches A1180-DS, Rev. 2 A1180/81/82/83 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; 5,694,038; 5,729,130; 5,917,320; ...

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