A3213 and A3214
Micropower Ultra-Sensitive Hall-Effect Switches
Features and Benefits
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▪
▪
▪
Micropower operation
Operate with north or south pole
2.4 to 5.5 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 assembly into applications due to magnetic pole
independence
Description
The A3213 and A3214 integrated circuits are ultra-sensitive,
pole independent Hall-effect switches with a latched digital
output. They are especially suited for operation in battery-
operated, hand-held equipment such as cell and cordless
telephones and palmtop computers. A 2.4 to 5.5 V operation
and a unique clocking scheme reduce the average operating
power requirements: the A3213 to 825
μW,
the A3214 to 14
μW
(typical, at 2.75 V). Except for operating duty cycle and average
operating current, the A3213 and A3214 are identical.
Unlike other Hall-effect switches, either a north or south pole
of sufficient strength will turn the output on; in the absence of
a magnetic field, the output is off. The polarity independence
and minimal power requirement allows 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.
These devices include, on a single silicon chip, a Hall-voltage
Continued on the next page…
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Packages
3 lead ultramini SIP
(suffix UA)
Not to scale
3 pin surface mount
SOT23-W (suffix LH)
Functional Block Diagram
SUPPLY
SWITCH
TIMING
LOGIC
DYNAMIC
OFFSET CANCELLATION
OUTPUT
SAMPLE
& HOLD
LATCH
X
GROUND
Dwg. FH-020-5
27622.62-DS Rev. Y
A3213
and
A3214
Micropower Ultra-Sensitive Hall-Effect Switches
Description (continued)
generator, small-signal amplifier, chopper stabilization, a latch,
and a MOSFET output. Advanced 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.
Devices are rated for operation over a temperature range of
–40°C to 85°C or –40°C to 150°C. Two package styles provide a
magnetically optimized package for most applications. ‘LH’ is a
miniature low-profile surface-mount package, ‘UA’ is a three-lead
SIP for through-hole mounting. Each package is lead (Pb) free
(suffix, –T) , with a 100% matte tin plated leadframe.
Product Selection Guide
Part Number
A3213ELHLT-T
A3213EUA-T
A3213LUA-T
A3214ELHLT-T
A3214EUA-T
Mounting
LH package
Surface Mount
UA package
SIP through hole
UA package
SIP through hole
LH package
Surface Mount
UA package
SIP through hole
Packing*
7-in. reel
3000 pieces/reel
Bulk
500 pieces/bag
Bulk
500 pieces/bag
7-in. reel
3000 pieces/reel
Bulk
500 pieces/bag
Ambient*, T
A
(ºC)
–40 to 85
DC
(%)
I
DD(AVG)
(typ)
(μA)
25
–40 to 150
309
–40 to 85
0.10
6
*Contact Allegro for additional packing and operating temperature range options
Absolute Maximum Ratings
Characteristic
Supply Voltage
Magnetic Flux Density
Output Off Voltage
Output Current
Operating Ambient Temperature
Maximum Junction Temperature
Storage Temperature
Symbol
V
DD
B
V
OUT
I
OUT
T
A
T
J
(max)
T
stg
Range E
Range L
Notes
Rating
6
Unlimited
6
1
–40 to 85
–40 to 150
165
–65 to 170
Units
V
G
V
mA
ºC
ºC
ºC
ºC
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
2
A3213
and
A3214
Micropower Ultra-Sensitive Hall-Effect Switches
Pin-out Diagrams
Number
LH
1
3
2
UA
1
2
3
Name
VDD
GND
VOUT
Description
Input power supply; tie to GND with bypass capacitor
Ground
Output signal
LH Package
UA Package
GND
3
1
VDD
2
VOUT
1
X
2
3
VOUT
GND
VDD
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
3
A3213
and
A3214
Micropower Ultra-Sensitive Hall-Effect Switches
ELECTRICAL CHARACTERISTICS
valid over operating voltage and temperature range, unless otherwise noted
Characteristic
Supply Voltage Range
Output Leakage Current
Output On Voltage
Awake Time
Period
Duty Cycle
Chopping Frequency
Symbol
V
DD
I
OFF
V
OUT(ON)
t
awake
t
period
DC
f
C
I
DD(EN)
Supply Current
I
DD(DIS)
I
DD(AVG)
1
Typical
2
Operate
Test Conditions
Operating
1)
V
OUT
= 5.5 V, B
RPN
< B < B
RPS
Output on, I
OUT
= 1 mA, V
DD
= 3.0 V
A3213
A3214, T
A
= 25°C, V
DD
= 3 V
A3213
A3214
Chip awake (enabled)
Chip asleep (disabled)
A3213
A3214
Min.
2.4
–
–
–
–
–
–
–
–
–
–
–
–
Typ.
1
3.0
<1.0
100
60
240
60
25
0.10
340
–
–
309
6
Max.
5.5
1.0
300
90
360
90
–
–
–
2.0
8.0
850
22
Units
V
μA
mV
μs
μs
ms
%
%
kHz
mA
μA
μA
μA
Data is at T
A
= 25°C and V
DD
= 3.0 V and is for design information only.
and release points will vary with supply voltage. B
OPx
= operate point (output turns ON); B
RPx
= release point (output turns OFF).
MAGNETIC CHARACTERISTICS
1
valid over operating voltage and temperature range, unless otherwise noted
Characteristic
Operate Points
Release Points
Hysteresis
1
As
2
B
Symbol
2
B
OPS
B
OPN
B
RPS
B
RPN
B
hys
Test Conditions
South pole to branded side
North pole to branded side
South pole to branded side
North pole to branded side
|B
OPx
- B
RPx
|
Min.
–
–70
10
–
–
Typ.
3
42
–48
32
–38
10
Max.
70
–
–
–10
–
Units
4
G
G
G
G
G
used here, negative flux densities are defined as less than zero (algebraic convention) and -50 G is less than +10 G.
OPx
= operate point (output turns ON); B
RPx
= release point (output turns OFF).
3
Typical Data is at T = 25°C and V
A
DD
= 3.0 V and is for design information only.
4
1 gauss (G) is exactly equal to 0.1 millitesla (mT).
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
4
A3213
and
A3214
Characteristic
Micropower Ultra-Sensitive Hall-Effect Switches
Symbol
Test Conditions*
Package LH, 1-layer PCB with copper limited to solder pads
Package LH, 2-layer PCB with 0.463 in.
2
of copper area each side
connected by thermal vias
Package UA, 1-layer PCB with copper limited to solder pads
Value Units
228
110
165
ºC/W
ºC/W
ºC/W
THERMAL CHARACTERISTICS may require derating at maximum conditions, see application information
Package Thermal Resistance
R
θJA
*Additional thermal information available on Allegro website.
V
DD(max)
Maximum Allowable V
DD
(V)
V
DD(min)
Power Dissipation versus Ambient Temperature
1900
1800
1700
1600
1500
1400
1300
1200
1100
1000
900
800
700
600
500
400
300
200
100
0
20
Power Dissipation, P
D
(mW)
2-
l
(R aye
rP
JA
= 1 CB
10 , Pa
1-la
ºC ck
/W ag
(R yer PC
eL
)
B, P
JA
=
H
165
ack
ºC/
age
W)
UA
1-lay
er P
(R
CB,
P
JA
= 2
28 º ackage
C/W
LH
)
40
60
80
100
120
Temperature (°C)
140
160
180
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
5
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