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Allegro MicroSystems
Allegro MicroSystems

A3211 Datasheet Preview

A3211 Datasheet

Micropower, Ultrasensitive Hall-Effect Switches

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A3211 pdf
FEATURES AND BENEFITS
• AEC-Q100 automotive qualified
• 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 protection
• Solid-state reliability
• Small size
• Easily manufacturable with magnet pole independence
Packages:
DFN (EL)
DFN (EH)
SOT23W (LH) Not to scale
SIP (UA)
A3211 and A3212
Micropower, Ultrasensitive
Hall-Effect Switches
DESCRIPTION
TheA3211 andA3212 integrated circuits are ultrasensitive, pole
independent Hall-effect switches with latched digital output.
These devices are especially suited for operation in battery-
operated, hand-held equipment such as cellular and cordless
telephones, pagers, and palmtop computers. A 2.5 to 3.5 V
operation and a unique clocking scheme reduce the average
operating power requirements to less than 15 μW with a
2.75 V supply.
Unlike other Hall-effect switches, either a north or south pole
of sufficient 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 dependencies, and thermal stress.
This device includes on a single silicon chip a Hall-voltage
generator, small-signal amplifier, chopper stabilization, a
latch, and a MOSFET output. Advanced CMOS processing
is used to take advantage of low-voltage and low-power
Continued on next page....
SUPPLY
SWITCH
X
TIMING
LOGIC
OUTPUT
GROUND
3211-DS, Rev. 22
Functional Block Diagram
Dwg. FH-020-5



Allegro MicroSystems
Allegro MicroSystems

A3211 Datasheet Preview

A3211 Datasheet

Micropower, Ultrasensitive Hall-Effect Switches

No Preview Available !

A3211 pdf
A3211 and
A3212
Micropower, Ultrasensitive
Hall-Effect Switches
Description (continued)
requirements, component matching, very low input-offset errors,
and small component geometries.
Four package styles provide magnetically optimized solutions for
most applications. Miniature low-profile surface-mount package
types EH and EL (0.75 and 0.50 mm nominal height) are leadless, LH
is a 3-pin low-profile SMD, and UA is a three-pin SIP for through-
hole mounting. Packages are lead (Pb) free (suffix, –T) with 100%
matte-tin-plated leadframes.
SPECIFICATIONS
Selection Guide
Part Number
A3211EEHLT–T2,3,4
Packing1
3000 pieces per reel
Package
2 mm x 3 mm, 0.75 mm nominal height DFN
Ambient Temperature
State in
TA (°C)
Magnetic Field
A3211EELLT–T2,4,5
A3211ELHLT–T4
3000 pieces per reel
3000 pieces per reel
2 mm x 2 mm, 0.50 mm nominal height DFN
3-pin surface mount SOT23W
–40 to 85
Off
A3211ELHLX–T4 10000 pieces per 13-in. reel
3-pin surface mount SOT23W
A3212EEHLT–T2,3
3000 pieces per reel
2 mm x 3 mm, 0.75 mm nominal height DFN
A3212EELLT–T2,5
3000 pieces per reel
2 mm x 2 mm, 0.50 mm nominal height DFN
A3212ELHLT–T
3000 pieces per reel
3-pin surface mount SOT23W
–40 to 85
A3212ELHLX–T
A3212EUA–T
10000 pieces per 13-in. reel
500 pieces per bulk bag
3-pin surface mount SOT23W
SIP-3 through hole
On
A3212LLHLT–T
3000 pieces per reel
3-pin surface mount SOT23W
A3212LLHLX–T 10000 pieces per 13-in. reel
3-pin surface mount SOT23W
–40 to 150
A3212LUA–T
500 pieces per bulk bag
SIP-3 through hole
1 Contact Allegro for additional packaging and handling options.
2 Allegro products sold in DFN package types are not intended for automotive applications.
3 Variant is no longer in production. The device should not be purchased for new design applications. Samples are no longer available. Date of status change:
June 1, 2015 (A3212EEHLT-T), December 1, 2015 (A3211EEHLT-T).
4 For automotive sales, please contact the field applications engineer.
5 Variant is in production but has been determined to be NOT FOR NEW DESIGN. This classification indicates that sale of the variant is currently restricted to existing cus-
tomer applications. The variant should not be purchased for new design applications because obsolescence in the near future is probable. Samples are no longer available.
Status change: March 2, 2015.
Absolute Maximum Ratings
Characteristic
Supply Voltage
Magnetic Flux Density
Output Off Voltage
Output Current
Operating Ambient Temperature
Maximum Junction Temperature
Storage Temperature
Symbol
VDD
B
VOUT
IOUT
TA
TJ(max)
Tstg
Range E
Range L
Notes
Rating
5
Unlimited
5
1
–40 to 85
–40 to 150
165
–65 to 170
Units
V
G
V
mA
ºC
ºC
ºC
ºC
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
2


Part Number A3211
Description Micropower, Ultrasensitive Hall-Effect Switches
Maker Allegro MicroSystems
Total Page 13 Pages
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