ALLEGRO A1180, A1181, A1182 User Manual

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Sensitive Two-Wire Field-Programmable Chopper-Stabilized

Package LH, 3-pin SOT

1. VCC

2. No connection

3. GND

Package UA, 3-pin SIP

A1180/81/82/83

Unipolar Hall-Effect Switches

The A1180, A1181, A1182, and A1183 devices are sensitive, two-wire, unipolar,
Hall effect switches. The operate point, BOP, can be fi eld-programmed, after fi nal

3

NC

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 applica­tion 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.

1. VCC

2. GND

3. GND

1 2 3

AB SO LUTE MAX I MUM RAT INGS

Supply Voltage, V
Reverse-Supply Voltage, V

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

Operating Temperature
Ambient, T
Ambient, T
Maximum Junction, T
Storage Temperature, T

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

CC

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

A

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

A

........................–18 V

RCC

........................165ºC

J(max)

.................. –65ºC to 170ºC

S

Two-wire unipolar switches are particularly advantageous in price-sensitive appli­cations, because they require one less wire than the more traditional open-collec­tor 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

HIGH in the presence of a south

polarity magnetic fi eld of suffi cient strength; and switch LOW otherwise, including
when there is no signifi cant magnetic fi eld present. The A1180 and A1182 have
inverted output current levels: switching LOW in the presence of a south polarity
magnetic fi eld of suffi cient strength, and HIGH otherwise. The devices also differ in
their specifi ed LOW current supply levels.

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

Chopper stabilization

 Low switchpoint drift over operating

temperature range

 Low stress sensitivity

Field-programmable for optimized

switchpoints

On-chip protection

 Supply transient protection

 Reverse-battery protection

 On-board voltage regulator

 3.5 V to 24 V operation

A1180-DS, Rev. 2

Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 [phone]

www.allegromicro.com

A1180/81/82/83

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

Product Selection Guide

Part Number

A1180ELHLT –

A1180ELHLT-T Yes

A1180EUA –

A1180EUA-T Yes

A1180LLHLT –

A1180LLHLT-T Yes

A1180LUA –

A1180LUA-T Yes

A1181ELHLT –

A1181ELHLT-T Yes

A1181EUA –

A1181EUA-T Yes

A1181LLHLT –

A1181LLHLT-T Yes

A1181LUA –

A1181LUA-T Yes

A1182ELHLT

A1182ELHLT-T Yes

A1182EUA –

A1182EUA-T Yes

A1182LLHLT –

A1182LLHLT-T Yes

A1182LUA –

A1182LUA-T Yes

A1183ELHLT

A1183ELHLT-T Yes

A1183EUA –

A1183EUA-T Yes

A1183LLHLT –

A1183LLHLT-T Yes

A1183LUA –

A1183LUA-T Yes

1

Contact Allegro for additional packing options.

2

South (+) magnetic fields must be of sufficient strength.

3

These variants are in production but have been determined to be NOT FOR NEW DESIGN. This classification indicates that sale of this device is cur-

Pb-

free

7-in. reel, 3000 pieces/reel Surface mount

Bulk, 500 pieces/bag 4-pin SIP through hole

7-in. reel, 3000 pieces/reel Surface mount

Bulk, 500 pieces/bag 4-pin SIP through hole

7-in. reel, 3000 pieces/reel Surface mount

Bulk, 500 pieces/bag 4-pin SIP through hole

7-in. reel, 3000 pieces/reel Surface mount

Bulk, 500 pieces/bag 4-pin SIP through hole

3

–

7-in. reel, 3000 pieces/reel Surface mount

Bulk, 500 pieces/bag 4-pin SIP through hole

7-in. reel, 3000 pieces/reel Surface mount

Bulk, 500 pieces/bag 4-pin SIP through hole

3

–

7-in. reel, 3000 pieces/reel Surface mount

Bulk, 500 pieces/bag 4-pin SIP through hole

7-in. reel, 3000 pieces/reel Surface mount

Bulk, 500 pieces/bag 4-pin SIP through hole

Packing

1

Mounting

Ambient, T

(°C)

–40 to 85

–40 to 150

–40 to 85

–40 to 150

–40 to 85

–40 to 150

–40 to 85

–40 to 150

A

Output

South (+) Field

Low

High

Low

High

Supply Current at
Low Output, I

2

(mA)

2 to 5

5 to 6.9

CC(L)

rently restricted to existing customer applications. The device should not be purchased for new design applications because obsolescence in the near
future is probable. Samples are no longer available. Status date change May 2, 2005.

A1180-DS, Rev. 2

Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 [phone]

www.allegromicro.com

2

A1180/81/82/83

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

Functional Block Diagram

V+

VCC

Program/Lock

0.01 uF

Dynamic Offset

Cancellation

Programming

Logic

Clock/Logic

Amp

Offset

Regulator

Low-Pass
Filter

Sample and Hold

GND

Package UA Only

GND

A1180-DS, Rev. 2

Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 [phone]

www.allegromicro.com

3

A1180/81/82/83

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

ELECTRICAL CHARACTERISTICS over the operating voltage and temperature range, unless otherwise specifi ed

Characteristic Symbol Test Conditions Min. Typ. Max. Units

Supply Voltage

Supply Current

1

2

Supply Zener Clamp Voltage V

Supply Zener Clamp Current I

Reverse Supply Current I

Output Slew Rate

3

Chopping Frequency f

Power-On Time

Power-On State

1

VCC represents the generated voltage between the VCC pin and the GND pin.

2

Relative values of B use the algebraic convention, where positive values indicate south magnetic polarity, and negative values indicate north magnetic

polarity; therefore greater B values indicate a stronger south polarity fi eld (or a weaker north polarity fi eld, if present).

3

Measured without bypass capacitor between VCC and GND. Use of a bypass capacitor results in slower current change.

4Measured with and without bypass capacitor of 0.01 μF. Adding a larger bypass capacitor causes longer Power-On Time.

5

POS is defi ned as true only with a VCC slew rate of 25 mV / μs or greater. Operation with a VCC slew rate less than 25 mV / μs can permanently harm

device performance.

6

POS is undefi ned for t > ton or BRP < B < BOP .

4

5,6

V

CC

Device powered on 3.5 – 24 V

B >BOP for A1180; B <BRP for A1181 2 – 5 mA

I

CC(L)

I

CC(H)

Z(supply)ICC

Z(supply)VZ(supply)

RCC

B >B

OP

B >BOP for A1181, A1183
B <B

RP

= I

CC(L)(max)

V

= –18 V – – –1.6 mA

RCC

No bypass capacitor; capacitance of the

di/dt

oscilloscope performing the measurement
= 20 pF

C

t

on

POS ton ≤ t

After factory trimming; with and without
bypass capacitor (C

on(max)

for A1182; B <BRP for A1183 5 – 6.9 mA

for A1180, A1182

12 – 17 mA

+ 3 mA; TA = 25°C 28 – 40 V

= 28 V – –

CC(L)(max)

+ 3 mA

mA

I

– 36 – mA/μs

– 200 – kHz

= 0.01 μF)

BYP

; V

slew rate ≥ 25 mV/μs – HIGH – –

CC

––25μs

MAGNETIC CHARACTERISTICS

1

over the operating voltage and temperature range, unless otherwise specifi ed

Characteristic Symbol Test Conditions Min. Typ. Max. Units

Programmable Operate Point Range B

Initial Operate Point Range B

Switchpoint Step Size

2

OPrange

OPinitVCC

B

RES

ICC = I
ICC = I

VCC = 5 V, TA = 25°C 4 8 12 G

for A1180 and A1182

CC(H)

for A1181 and A1183

CC(L)

60 – 200 G

= 12 V – 33 60 G

Switchpoint setting – 5 – Bit

Number of Programming Bits

Temperature Drift of B

OP

Hysteresis B

1

Relative values of B use the algebraic convention, where positive values indicate south magnetic polarity, and negative values indicate north magnetic

polarity; therefore greater B values indicate a stronger south polarity fi eld (or a weaker north polarity fi eld, if present).

2

The range of values specifi ed for B

A1180-DS, Rev. 2

is a maximum, derived from the cumulative programming bit errors.

RES

ΔB

–

Programming locking – 1 – Bit

OP

HYS

B

HYS

= BOP – B

RP

– – ±20 G

51530G

Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 [phone]

www.allegromicro.com

4

A1180/81/82/83

10

12

14

16

18

20

3.5

12

24

3.5

12

24

3.5

12

24

3.5

12

24

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

Characteristic Data

I

versus Ambient Temperature

CC(L)

at Various Levels of V

CC

(A1180, A1181)

10

10

I

versus Ambient Temperature

CC(L)

at Various Levels of V

(A1182, A1183)

CC

8

6

(mA)

4

CC(L)

I

2

0

-50 0 50 100 150 200

Ambient Temperature, TA(°C)

(mA)

CC(H)

I

-50 0 50 100 150 200

VCC(V)

I

versus Ambient Temperature

CC(H)

at Various Levels of V

(A1180, A1181, A1182, A1183)

8

6

(mA)

4

CC(L)

I

2

0

-50 0 50 100 150 200

Ambient Temperature, TA(°C)

CC

VCC(V)

VCC(V)

200

175

(G)

150

OP

125

100

75

Average B

50

25

A1180-DS, Rev. 2

Ambient Temperature, T

Average BOPBits versus Ambient Temperature

(A1180, A1181, A1182, A1183)

(°C)

A

Hysteresis versus Ambient Temperature

at Various Levels of V

CC

(A1180, A1181, A1182, A1183)

30

(G)

HYS

B

25

20

15

10

5

Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 [phone]

www.allegromicro.com

B

OPinit

B

it 1

B

it 2

B

it 3

B

it 4

B

it 5

0

-50 0 50 100 150 200 -50 0 50 100 150 200

Ambient Temperature, T

(°C) Ambient Temperature, TA(°C)

A

VCC(V)

5