ALLEGRO A3211 User Manual
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2 x 2 mm MLPD
EL Package
A321 1 and A3212
MICROPOWER, ULTRA-SENSITIVE
HALL-EF FECT SWITCHES
The A 3211 and A3212 integrated circuits are ultra-sensitive, pole in de pen dent
Hall-effect switches with latched digital output. These sensors 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 volt to 3.5 volt
operation and a unique clocking scheme reduce the average op er at ing power
requirements to less than 15 μW with a 2.75 volt 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.
Approximate actual size
ABSOLUTE MAXIMUM RATINGS
Supply Voltage, V
Magnetic Flux Density, B .......... Unlimited
Output Off Voltage, V
Output Current, I
Junction Temperature, T
Operating Temperature, TA
Range 'E-' .................... -40°C to +85°C
Range 'L-' .................. -40°C to +150°C
Storage Temperature Range,
T
.............................. -65°C to +170°C
S
.............................. 5 V
DD
...................... 5 V
OUT
........................... 1 mA
OUT
................ +170°C
J
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.
This device includes on a single silicon chip a Hall-voltage generator, small-signal amplifier, chopper sta bi li za tion, a latch, and a MOSFET output. Ad vanced
BiCMOS processing is used to take advantage of low-voltage and low-power
requirements, component matching, very low input-offset errors, and small component geometries.
Four package styles provide magnetically op ti mized solutions for most ap pli -
ca tions. Miniature low-profile surface-mount package types EH and EL
(0.75 and 0.50 mm nominal height) are leadless, LH is a leaded low-profile
SMD, and UA is a three-lead SIP for through-hole mount ing. Packages are available in lead (Pb) free versions (suffix, –T) with 100% matte tin plated leadframe.
EL package for limited release, engineering samples available.
FEATURES
■ Micropower Operation
■ Operation with North or
■ 2.5 V to 3.5 V Battery Operation
■ Chopper Stabilized
Superior Temperature Stability
Extremely Low Switch-Point Drift
Insensitive to Physical Stress
■ High ESD Protection
■ Sol id-State Reliability
■ Small Size
■ Easily Manufacturable with Magnet Pole Independence
South Pole
A3211-DS, Rev. 2
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
A321 1 and A3212
MICROPOWER,
ULTRA-SENSITIVE
HALL-EFFECT SWITCH
Use complete part numbers when ordering
Product Selection Guide
Part Number Pb-free
A3211EEHLT–T Yes Tape and Reel (3000)
A3211ELHLT–T Yes Tape and Reel (3000) 3-Pin Surface Mount
A3212EEHLT – Tape and Reel (3000)
A3212EEHLT–T Yes Tape and Reel (3000)
A3212EELLT–T Yes Tape and Reel (3000)
A3212ELHLT – Tape and Reel (3000)
A3212ELHLT–T Yes Tape and Reel (3000)
A3212EUA – Bulk Pack (500)
A3212EUA–T Yes Bulk Pack (500)
A3212LLHLT
A3212LLHLT–T Yes Tape and Reel (3000)
A3212LUA
A3212LUA–T Yes Bulk Pack (500)
1
Contact Allegro for additional packaging and handling options.
2
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-
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 October 31, 2005.
2
2
– Tape and Reel (3000)
– Bulk Pack (500)
Packing
(Units/Pack)
1
Package
Leadless Surface Mount
Leadless Surface Mount
3-Pin Surface Mount
SIP-3 Through Hole, Straight Lead
3-Pin Surface Mount
SIP-3 Through Hole, Straight Lead
Ambient
Temperature
(°C)
T
A
–40 to 85A3211EELLT–T Yes Tape and Reel (3000)
–40 to 85
–40 to 150
2
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
A321 1 and A3212
MICROPOWER,
ULTRA-SENSITIVE
HALL-EFFECT SWITCH
SUPPLY
SWITCH
FUNCTIONAL BLOCK DIAGRAM
TIMING
LOGIC
OUTPUT
X
DYNAMIC
OFFSET CANCELLATION
& HOLD
SAMPLE
LATCH
GROUND
Dwg. FH-020-5
3
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
A321 1 and A3212
X
Dwg. PH-016-2
SUPPLY
GROUND
OUTPUT
V
DD
GROUND
NO
CONNECTION
NO
CONNECTION
5
4
6
1
3
2
MICROPOWER,
ULTRA-SENSITIVE
HALL-EFFECT SWITCH
Package Suffix ‘EH’ Pinning
(Leadless Chip Carrier)
Package Suffix ‘EL’ Pinning
(Leadless Chip Carrier)
3
V
DD
12
SUPPLY
GROUND
OUTPUT
Dwg. PH-016-1
Package Suffix ‘LH’ Pinning
(SOT23W)
Package Suffix ‘UA’ Pinning
(SIP)
3
X
V
DD
V
DD
12
SUPPLY
GROUND
Dwg. PH-016-1
OUTPUT
Pinning is shown viewed from branded side.
1
SUPPLY
32
GROUND
Dwg. PH-016
OUTPUT
www.allegromicro.com
4
A321 1 and A3212
MICROPOWER,
ULTRA-SENSITIVE
HALL-EFFECT SWITCH
ELECTRICAL CHARACTERISTICS over operating voltage and temperature range (unless otherwise specified).
Characteristic Symbol Test Conditions
Supply Voltage Range V
Output Leakage Current I
Output On Voltage V
Awake Time t
Period t
Duty Cycle d.c. – 0.1 – %
Chopping Frequency f
Supply Current
* Typical data is at T
= 25°C and VDD = 2.75 V, and is for design information only.
A
DD
OFF
OUT
awake
period
C
I
DD(EN)
I
DD(DIS)
I
DD(AVG)
Operating 2.5 2.75 3.5 V
V
= 3.5 V, Output off – <1.0 1.0 μA
OUT
I
= 1 mA, VDD = 2.75 V – 100 300 mV
OUT
Chip awake (enabled) – – 2.0 mA
Chip asleep (disabled) – – 8.0 μA
VDD = 2.75 V – 5.1 10 μA
= 3.5 V – 6.7 10 μA
V
DD
Min. Typ.* Max. Units
–4590μs
–4590ms
– 340 – kHz
Limits
5
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
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