A3211EUA-T Allegro Microsystems Inc, A3211EUA-T Datasheet

A3211EUA-T

Manufacturer Part Number

A3211EUA-T

Description

IC SWITCH HALL EFFECT 3-SIP

Manufacturer

Allegro Microsystems Inc

Type

Digital Omnipolar Switchr

Datasheet

1.A3212ELHLT-T.pdf (12 pages)

Specifications of A3211EUA-T

Sensing Range

±55G Trip, ±10G Release

Voltage - Supply

2.5 V ~ 3.5 V

Current - Supply

2mA

Current - Output (max)

1mA

Output Type

Digital, Open Collector

Features

Ultra Sensitive

Operating Temperature

-40°C ~ 85°C

Package / Case

3-SIP

Magnetic Type

Latch

Operating Supply Voltage (min)

2.5V

Operating Supply Voltage (typ)

2.75V

Operating Supply Voltage (max)

3.5V

Output Current

1mA

Mag Sensor Operate Point (g)

55Gs

Mag Sensor Release Point (g)

10Gs

Mag Sensor Hysteresis(g)

5.9Gs

Package Type

Ultra Mini SIP

Pin Count

Mounting

Through Hole

Operating Temp Range

-40C to 85C

Operating Temperature Classification

Industrial

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

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Features and Benefits

▪ Micropower operation

▪ Operation with north or south pole

▪ 2.5 to 3.5 V battery operation

▪ Chopper stabilized

▪ High ESD protection

▪ Sol id-state reliability

▪ Small size

▪ Easily manufacturable with magnet pole independence

Packages:

Not to scale

3211-DS, Rev. 13

DFN/MLPD (EH)

▫ Superior temperature stability

▫ Extremely low switchpoint drift

▫ Insensitive to physical stress

SOT23W (LH)

SUPPLY

DFN/MLPD (EL)

SWITCH

Functional Block Diagram

SIP (UA)

TIMING

LOGIC

Description

The A 3211 and A3212 integrated circuits are ultrasensitive,

pole in de pen dent Hall-effect switches with latched digital

output. These devices are es pe cial ly suited for operation

in battery-operated, hand-held equip ment such as cellular

and cordless tele phones, pagers, and palmtop com put ers.

A 2.5 to 3.5 V operation and a unique clocking scheme reduce

the average op er at ing power requirements to less than 15 W

with a 2.75 V supply.

Unlike other Hall-effect switches, either a north or south pole

of suf fi cient strength will turn the output on in the A3212,

and in the absence of a magnetic field, the output is off. The

A3211 provides an inverted output. The polarity independence

and minimal power requirements allow these devices to easily

replace reed switches for superior reliability and ease of

manufacturing, while eliminating the requirement for signal

conditioning.

Improved stability is made possible through chopper

stabilization (dynamic offset cancellation), which reduces the

residual offset voltage normally caused by device overmolding,

temperature de pen den cies, and thermal stress.

Continued on the next page…

Micropower, Ultrasensitive

Hall-Ef fect Switches

A3211 and A3212

Dwg. FH-020-5

GROUND

OUTPUT

Related parts for A3211EUA-T

A3211EUA-T Summary of contents

Page 1

Features and Benefits ▪ Micropower operation ▪ Operation with north or south pole ▪ 2.5 to 3.5 V battery operation ▪ Chopper stabilized ▫ Superior temperature stability ▫ Extremely low switchpoint drift ▫ Insensitive to physical stress ▪ High ESD ...

Page 2

A3211 and A3212 Description (continued) This device includes on a single silicon chip a Hall-voltage gen- erator, small-signal amplifier, chopper sta tion, a latch, and a MOSFET output. Advanced CMOS processing is used to take advantage of ...

Page 3

A3211 and A3212 Package Suffix ‘EH’ Pinning (Leadless Chip Carrier Package Suffix ‘LH’ Pinning (SOT23W Dwg. PH-016 Pinning is shown viewed from branded side. Micropower, Ultrasensitive Hall-Effect ...

Page 4

A3211 and A3212 ELECTRICAL CHARACTERISTICS Characteristic Supply Voltage Range Output Leakage Current Output On Voltage Awake Time Period Duty Cycle Chopping Frequency Supply Current * Typical data 25°C and V = 2.75 V, and is for ...

Page 5

A3211 and A3212 A3211 MAGNETIC CHARACTERISTICS Characteristic Symbol Over Temperature Range –40°C to 85° South pole to branded side; B > B OPS Operate Points B North pole to branded side; B > B OPN ...

Page 6

A3211 and A3212 TYPICAL OPERATING CHARACTERISTICS OPS B RPS 20 0 -20 B RPN -40 B OPN -60 -50 - AMBIENT TEMPERATURE IN ° ° ° ° C 7.0 6 =2.75 ...

Page 7

A3211 and A3212 Low Average Power. Internal timing circuitry activates the IC for 45 μs and deactivates it for the remainder of the period (45 ms). A short "awake" time allows for stabilization prior to the sam pling and data ...

Page 8

A3211 and A3212 Operation. The output of the A3212 switches low (turns on) when a magnetic field perpendicular to the Hall element exceeds the operate point B (or is less than B OPS output is capable of sinking up to ...

Page 9

A3211 and A3212 D 7X 0.08 C 0.25 ±0.05 0.5 BSC 0.55 ±0.10 For Reference Only, not for tooling use (reference DWG-2861; reference JEDEC MO-229WCED, Type 1) Dimensions in millimeters Exact case and lead configuration at supplier discretion within limits ...

Page 10

A3211 and A3212 E 2.00 ±0. 0.08 C +0.07 0.25 –0.05 0.40 ±0.05 For Reference Only, not for tooling use (reference DWG-2865; reference JEDEC MO-229UCCD) Dimensions in millimeters Exact case and lead configuration at supplier discretion within limits ...

Page 11

A3211 and A3212 +0.12 2.98 –0.08 3 +0.10 2.90 –0. 10° REF 0.95 BSC For Reference Only; not for tooling use (reference dwg. 802840) Dimensions in millimeters Dimensions exclusive of mold flash, gate burrs, and dambar protrusions Exact ...

Page 12

A3211 and A3212 4.09 45° +0.08 3.02 –0.05 2.16 MAX 0.51 REF 1 2 15.75 ±0.51 +0.05 0.43 –0.07 Copyright ©2002-2010, Allegro MicroSystems, Inc. Allegro MicroSystems, Inc. reserves the right to make, from time to time, such de par tures ...

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