ALLEGRO A3282 User Manual

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Package LH, 3-pin Surface Mount

GND

3

1

2

VCC

VOUT

Package UA, 3-pin SIP

A3282

Chopper-Stabilized Hall Effect Latch

The A3282 Hall-effect sensor is a temperature stable, stress-resistant latch. Supe­rior high-temperature performance is made possible through an Allegro® pat­ented dynamic offset cancellation that utilizes chopper-stabilization. This method
reduces the offset voltage normally caused by device overmolding, temperature
dependencies, and thermal stress. The A3282 complements the current Allegro
family of chopper-stabilized latching sensors.

The A3282 includes the following on a single silicon chip: voltage regulator, Hall-

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voltage generator, small-signal amplifi er, chopper stabilization, Schmitt trigger,
and a short circuit protected open-drain output. Advanced BiCMOS wafer fabrica­tion processing is used to take advantage of low-voltage requirements, component
matching, very low input-offset errors, and small component geometries.

This device requires the presence of both south and north polarity magnetic fi elds
for operation. In the presence of a south polarity fi eld of suffi cient strength, the
device output latches on, and only switches off when a north polarity fi eld of suf-
fi cient strength is present.

1 32

VCC

GND

VOUT

1

2

3

AB SO LUTE MAX I MUM RAT INGS

Supply Voltage, VCC..........................................28 V

Reverse-Supply Voltage, V
Output Off Voltage, V
Output Current, I

OUT

OUTSINK

Reverse-Output Current, I

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

Operating Temperature
Ambient, T
Ambient, T

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

A

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

A

Maximum Junction, T
Storage Temperature, T

........................–18 V

RCC

............................... 26.5 V

........... Internally Limited

....................–10 mA

ROUT

......................165ºC

J(MAX)

.................. –65ºC to 170ºC

S

The A3282 is rated for operation between the ambient temperatures –40°C and
85°C for the E temperature range, and –40°C to 150°C for the L temperature
range. The two package styles available provide magnetically optimized solutions
for most applications. Package LH is an SOT23W, a miniature low-profi le sur-
face-mount package, while package UA is a three-lead ultramini SIP for through­hole mounting. Each package is available in a lead (Pb) free version, with 100%
matte tin plated leadframes.

Features and Benefi ts

Chopper stabilization

 Superior temperature stability

 Extremely low switchpoint drift

 Insensitive to physical stress

Reverse battery protection

Output short circuit protection

Solid state reliability

Small size

Robust EMC capability

High ESD ratings (HBM)

A3282-DS

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

www.allegromicro.com

Chopper-Stabilized Hall Effect Latch

Part Number

A3282ELHLT –
A3282ELHLT-T Yes
A3282EUA –
A3282EUA-T Yes
A3282LLHLT –
A3282LLHLT-T Yes
A3282LUA –
A3282LUA-T Yes

*Contact Allegro for additional packing options.

Pb-

free

Packing* Mounting

7-in. reel, 3000 pieces/reel 3-pin SOT23W surface mount

Bulk, 500 pieces/bag 3-pin SIP through hole

7-in. reel, 3000 pieces/reel 3-pin SOT23W surface mount

Bulk, 500 pieces/bag 3-pin SIP through hole

A3282

Product Selection Guide

Ambient, TA

(°C)

–40 to 85

–40 to 150

B

RP(MIN)

B

(G)

–150 150

OP(MAX)

(G)

Functional Block Diagram

VCC

Regulator

To All Subcircuits

Amp

Cancellation

Dynamic Offset

Sample and Hold

Filter

Low-Pass

Terminal List

Name Description

VCC Connects power supply to chip 1 1

VOUT Output from circuit 2 3

GND Ground 3 2

Control

Current Limit

Package LH Package UA

VOUT

<1Ω

GND

Number

A3282-DS

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

www.allegromicro.com

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A3282

Chopper-Stabilized Hall Effect Latch

OPERATING CHARACTERISTICS valid over full operating voltage and ambient temperature ranges, unless otherwise noted

Characteristic Symbol Test Conditions Min. Typ. Max. Units

Electrical Characteristics

Supply Voltage

Output Leakage Current I

Output On Voltage V

Output Current Limit I

Power-On Time t

Chopping Frequency f

Output Rise Time

Output Fall Time

Supply Current

Reverse Battery Current I

Supply Zener Clamp Voltage V

Supply Zener Current

Magnetic Characteristics

Operate Point B

Release Point B

Hysteresis B

1

Maximum voltage must be adjusted for power dissipation and junction temperature, see Power Derating section.

2

CS = oscilloscope probe capacitance.

3

Maximum current limit is equal to the maximum I

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Magnetic fl ux density, B, is indicated as a negative value for north-polarity magnetic fi elds, and as a positive value for south-polarity magnetic fi elds.
This so-called algebraic convention supports arithmetic comparison of north and south polarity values, where the relative strength of the fi eld is indicated
by the absolute value of B, and the sign indicates the polarity of the fi eld (for example, a –100 G fi eld and a 100 G fi eld have equivalent strength, but
opposite polarity).

1

2

2

3

4

V

CC

OUTOFF

OUT(SAT)IOUT

OM

PO

c

t

r

t

f

I

CCON

I

CCOFF

RCC

Z

I

Z

OP

RP

HYS

Operating, TJ < 165°C 3.6 – 24 V

V

OUT

B > B

VCC > 3.6 V – 8 50 µs

R

LOAD

R

LOAD

B > B

B < B

V

RCC

ICC = 8 mA; TA = 25°C 28 – – V

VS = 28 V – – 8 mA

South pole adjacent to branded face of device 70 110 150

North pole adjacent to branded face of device –150 –110 –70

B

CC(MAX)

= 24 V, B < B

= 20 mA, B > B

OP

RP

OP

– – 10 µA

– 250 500 mV

30 – 60 mA

– 200 – kHz

= 820 Ω, CS = 20 pF – 0.2 1 µs

= 820 Ω, CS = 20 pF – 0.2 1 µs

OP

RP

– 1.6 5 mA

– 1.6 5 mA

= –18 V – – –2 mA

– B

OP

+ 3 mA.

RP

140 220 300

G

G

G

A3282-DS

DEVICE QUALIFICATION PROGRAM

Contact Allegro for information.

EMC (Electromagnetic Compatibility) REQUIREMENTS

Contact Allegro for information.

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

www.allegromicro.com

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A3282

Chopper-Stabilized Hall Effect Latch

Electrical Characteristic Data

Supply Current (On) versus Ambient Temperature

5.0

4.0

3.0

(mA)

2.0

CCON

I

1.0

0

–50 0 50 100 150

TA (°C)

Supply Current (Off) versus Ambient Temperature

5.0

4.0

3.0

(mA)

2.0

CCOFF

I

VCC (V)

VCC (V)

Supply Current (On) versus Supply Voltage

5.0

4.0

24

3.6

3.0

(mA)

2.0

CCON

I

1.0

0

0 5 10 15 20 25

VCC (V)

Supply Current (Off) versus Supply Voltage

5.0

4.0

3.0

24

3.6

(mA)

2.0

CCOFF

I

TA (°C)

–40

25

150

TA (°C)

–40

25

150

1.0

0

–50 0 50 100 150

TA (°C)

Output Voltage (On) versus Ambient Temperature

500

450

400

350

300

(mV)

250

200

OUT(SAT)

150

V

100

50

0

–50 0 50 100 150

TA (°C)

VCC (V)

24

3.6

1.0

0

0 5 10 15 20 25

VCC (V)

Output Voltage (On) versus Supply Voltage

500

450

400

350

300

(mV)

250

200

OUT(SAT)

150

V

100

50

0

0 5 10 15 20 25

VCC (V)

TA (°C)

–40

25

150

A3282-DS

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

www.allegromicro.com

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