A3209 and A3210: Micropower, Ultrasensitive Hall-Effect Switch

Data Sheet
27622.60C
3209 AND
3210
MICROPOWER, ULTRA-SENSITIVE
HALL-EFFECT SWITCHES
Package Suffix ‘LH’ Pinning
(SOT23W)
X
3
V
DD
OUTPUT
2
GROUND
SUPPLY
1
The A3209Ex and A3210Ex 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
cellular and cordless telephones, pagers, and palmtop computers. 2.5 volt to
3.5 volt operation and a unique clocking scheme to reduce the average operating power requirements – the A3209Ex to 400 µW, the A3210Ex to 25 µW!
Except for operating duty cycle and average operating current, the A3209Ex
and A3210Ex 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 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.
The A3209Ex and A3210Ex are rated for operation over a temperature
range of -40°C to +85°C. Two package styles provide a magnetically optimized package for most applications. Suffix ‘LH’ is a miniature low-profile
surface-mount package while suffix ‘UA’ is a three-lead ultra-mini-SIP for
through-hole or surface mounting.
T
C
U
D
O
.
n
R
y
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P on esig
d
D
e
w
c
E
e
n rn
U
e
r
o
N
f
e
I
f
e 213
T
r
r 3
N
o
F or A
O
C
— 12
S
I
2
3
D
A
e
Dwg. PH-016-1
Pinning is shown viewed from branded side.
ABSOLUTE MAXIMUM RATINGS
at TA = +25°C
Supply Voltage, VDD ............................. 5 V
Magnetic Flux Density, B .......... Unlimited
Output Off Voltage, VOUT ..................... 5 V
Output Current, IOUT .......................... 1 mA
FEATURES
■
■
■
■
Junction Temperature, TJ ............... +170°C
Operating Temperature Range,
TA ............................... -40°C to +85°C
Us
Storage Temperature Range,
TS .............................. -65°C to +170°C
Caution: These CMOS devices have input
static protection (Class 3) but are still
susceptible to damage if exposed to
extremely high static electrical charges.
■
■
■
■
Micropower Operation
Operate With North or South Pole
2.5 V to 3.5 V Battery Operation
Chopper Stabilized
Superior Temperature Stability
Extremely Low Switch-Point Drift
Insensitive to Physical Stress
ESD Protected to 5 kV
Solid-State Reliability
Small Size
Easily Manufacturable With Magnet Pole Independence
Always order by complete part number: the prefix ‘A’ + the basic four-digit
part number + the suffix ‘E’ to indicate operating temperature range + a
suffix to indicate package style, e.g., A3210ELH .
3209 AND 3210
MICROPOWER,
ULTRA-SENSITIVE
HALL-EFFECT SWITCHES
FUNCTIONAL BLOCK DIAGRAM
SUPPLY
SWITCH
OUTPUT
LATCH
SAMPLE
& HOLD
X
DYNAMIC
OFFSET CANCELLATION
TIMING
LOGIC
GROUND
Dwg. FH-020-5
Package Suffix ‘UA’ Pinning
(ultra-mini SIP)
X
700
Suffix "UA"
RθJA = 165°C/W
600
500
V
DD
Suffix "LH"
RθJA = 228°C/W
1
2
GROUND
400
SUPPLY
200
100
0
Dwg. PH-016
20
40
60
100
80
120
AMBIENT TEMPERATURE in °C
140
160
180
Dwg. GH-046-3B
2
3
300
OUTPUT
ALLOWABLE PACKAGE POWER DISSIPATION in MILLIWATTS
800
Pinning is shown viewed from branded side.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
Copyright © 2000, 2003 Allegro MicroSystems, Inc.
3209 AND 3210
MICROPOWER,
ULTRA-SENSITIVE
HALL-EFFECT SWITCHES
ELECTRICAL CHARACTERISTICS with CBYPASS = 0.1 µF,
over operating voltage and temperature range (unless otherwise specified).
Limits
Characteristic
Symbol
Test Conditions
Min.
Typ.
Max.
Units
2.5
2.75
3.5
V
Supply Voltage Range
VDD
Operating1)
Output Leakage Current
IOFF
VOUT = 3.5 V, BRPN < B < BRPS
–
«1.0
1.0
µA
Output On Voltage
VOUT
IOUT = 1 mA, VDD = 2.5 V
–
105
300
mV
Awake Time
tawake
30
60
90
µs
Period
tperiod
A3209Ex
240
480
720
µs
A3210Ex
30
60
90
ms
A3209Ex
–
12.5
–
%
A3210Ex
–
0.10
–
%
–
340
–
kHz
Duty Cycle
Chopping Frequency
Supply Current
(2.5 ≤ VDD ≤3.5 V)
d.c.
fC
IDD(EN)
Chip awake (enabled)
0.1
–
3.0
mA
IDD(DIS)
Chip asleep (disabled)
1.0
10
50
µA
IDD(AVG)
A3209Ex, VDD = 2.75 V
–
145
425
µA
A3209Ex, VDD = 3.5 V
–
195
425
µA
A3210Ex, VDD = 2.75 V
–
8.8
25
µA
A3210Ex, VDD = 3.5 V
–
13
60
µA
NOTES: 1. Operate and release points will vary with supply voltage.
2. BOPx = operate point (output turns ON); BRPx = release point (output turns OFF).
3. Typical Data is at TA = +25°C and VDD = 2.75 V and is for design information only.
MAGNETIC CHARACTERISTICS with CBYPASS = 0.1 µF,
over operating voltage and temperature range (unless otherwise specified).
Limits
Characteristic
Symbol
Operate Points
BOPS
Release Points
Hysteresis
Test Conditions
Min.
Typ.
Max.
Units
South pole to branded side
–
30
60
G
BOPN
North pole to branded side
-60
-35
–
G
BRPS
South pole to branded side
5.0
22
–
G
BRPN
North pole to branded side
–
-27
-5.0
G
Bhys
|BOPx - BRPx|
–
7.7
–
G
NOTES: 1. As used here, negative flux densities are defined as less than zero (algebraic convention) and -50 G is less than +10 G.
2. Typical Data is at TA = +25°C and VDD = 2.75 V and is for design information only.
www.allegromicro.com
3
3209 AND 3210
MICROPOWER,
ULTRA-SENSITIVE
HALL-EFFECT SWITCHES
TYPICAL OPERATING CHARACTERISTICS
as a function of temperature
SWITCH POINTS
60
SWITCH POINTS IN GAUSS
40
BOPS
BRPS
20
VDD = 2.75 V
0
-20
BRPN
BOPN
-40
-60
-50
-25
0
25
50
75
AMBIENT TEMPERATURE IN ° C
100
Dwg. GH-027-2
A3209-- SUPPLY CURRENT
A3210-- SUPPLY CURRENT
16
200
VDD = 3.5 V
180
VDD = 3 V
160
VDD = 2.5 V
140
120
-50
-25
0
25
50
AMBIENT TEMPERATURE IN ° C
4
AVERAGE SUPPLY CURRENT IN µ A
AVERAGE SUPPLY CURRENT IN µA
220
75
100
Dwg. GH-028-7
14
VDD = 3.5 V
12
VDD = 2.5 V
10
VDD = 3 V
8.0
6.0
-50
-25
0
25
50
AMBIENT TEMPERATURE IN ° C
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
75
100
Dwg. GH-028-6
3209 AND 3210
MICROPOWER,
ULTRA-SENSITIVE
HALL-EFFECT SWITCHES
TYPICAL OPERATING CHARACTERISTICS
as a function of supply voltage
SWITCH POINTS
60
SWITCH POINTS IN GAUSS
40
BOPS
BRPS
20
TA = 25°C
0
-20
BRPN
BOPN
-40
-60
2.4
2.6
2.8
3.0
3.2
3.4
SUPPLY VOLTAGE IN VOLTS
3.6
Dwg. GH-057-1
A3210-- SUPPLY CURRENT
16
200
14
AVERAGE SUPPLY CURRENT IN µA
AVERAGE SUPPLY CURRENT IN µA
A3209-- SUPPLY CURRENT
220
180
160
140
120
2.4
TA = 25°C
2.6
2.8
3.0
3.2
SUPPLY VOLTAGE IN VOLTS
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3.4
3.6
Dwg. GH-058-6
12
10
8.0
6.0
2.4
TA = 25°C
2.6
2.8
3.0
3.2
SUPPLY VOLTAGE IN VOLTS
3.4
3.6
Dwg. GH-058-5A
5
3209 AND 3210
MICROPOWER,
ULTRA-SENSITIVE
HALL-EFFECT SWITCHES
FUNCTIONAL DESCRIPTION
Low Average Power. Internal timing circuitry activates the
device for 60 µs and deactivates it for the remainder of the
period (480 µs for the A3209Ex and 60 ms for the A3210Ex).
A short "awake" time allows for stabilization prior to the
sampling and data latching on the falling edge of the timing
pulse. The output during the "sleep" time is latched in the last
sampled state. The supply current is not affected by the output
state.
SAMPLE
& HOLD
+V
X
PERIOD
IDD(EN)
60 µs - "AWAKE"
"SLEEP"
SAMPLE &
OUTPUT LATCHED
Dwg. EH-012-1
IDD(DIS)
0
Dwg. WH-017-1
B
+V
Chopper-Stabilized Technique. The Hall element can be
considered as a resistor array similar to a Wheatstone bridge. A
large portion of the offset is a result of the mismatching of these
resistors. These devices use a proprietary dynamic offset
cancellation technique, with an internal high-frequency clock to
reduce the residual offset voltage of the Hall element that is
normally caused by device overmolding, temperature dependencies, and thermal stress. The chopper-stabilizing technique
cancels the mismatching of the resistor circuit by changing the
direction of the current flowing through the Hall plate using
CMOS switches and Hall voltage measurement taps, while
maintaing the Hall-voltage signal that is induced by the external
magnetic flux. The signal is then captured by a sample-andhold circuit and further processed using low-offset bipolar
circuitry. This technique produces devices that have an
extremely stable quiescent Hall output voltage, are immune to
thermal stress, and have precise recoverability after temperature
cycling. This technique will also slightly degrade the device
output repeatability. A relatively high sampling frequency is
used in order that faster signals can be processed.
More detailed descriptions of the circuit operation can be
found in: Technical Paper STP 97-10, Monolithic Magnetic
Hall Sensor Using Dynamic Quadrature Offset Cancellation
and Technical Paper STP 99-1, Chopper-Stabilized Amplifiers
With A Track-and-Hold Signal Demodulator.
6
—
HALL
VOLTAGE
+
Dwg. AH-011-2
Operation. The output of this device switches low (turns on)
when a magnetic field perpendicular to the Hall element exceeds
the operate point BOPS (or is less than BOPN). After turn-on, the
output is capable of sinking up to 1 mA and the output voltage
is VOUT(ON). When the magnetic field is reduced below the
release point BRPS (or increased above BRPN), the device output
switches high (turns off). The difference in the magnetic
operate and release points is the hysteresis (Bhys) of the device.
This built-in hysteresis allows clean switching of the output
even in the presence of external mechanical vibration and
electrical noise.
As used here, negative flux densities are defined as less
than zero (algebraic convention) and -50 G is less than +10 G.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
3209 AND 3210
MICROPOWER,
ULTRA-SENSITIVE
HALL-EFFECT SWITCHES
ELEMENT LOCATIONS
OUTPUT OFF
5V
MAX
B OPS
OUTPUT VOLTAGE
B OPN
Package Designator ‘LH’
ACTIVE AREA DEPTH
0.011"
0.28 mm
NOM
BRPS
BRPN
0.038"
0.96 mm
OUTPUT ON
A
0
0
-B
3
0.059"
1.49 mm
+B
MAGNETIC FLUX
1
Dwg. GH-043-1
Applications. Allegro's pole-independent sensing technique
allows for operation with either a north pole or south pole
magnet orientation, enhancing the manufacturability of the
device. The state-of-the-art technology provides the same
output polarity for either pole face.
It is strongly recommended that an external bypass capacitor be connected (in close proximity to the Hall element) between
the supply and ground of the device to reduce both external
noise and noise generated by the chopper-stabilization technique. This is especially true due to the relatively high impedance of battery supplies.
The simplest form of magnet that will operate these devices
is a bar magnet with either pole near the branded surface of the
device. Many other methods of operation are possible. Extensive applications information on magnets and Hall-effect
devices is also available in the Allegro Electronic Data Book
AMS-702 or Application Note 27701, or at
2
Dwg. MH-025
Package Designator ‘UA’
ACTIVE AREA DEPTH
0.0195"
0.50 mm
NOM
0.081"
2.06 mm
0.057"
1.45 mm
A
BRANDED
SURFACE
1
2
3
www.allegromicro.com
Dwg. MH-011-11A
2
OUTPUT
1
X
V
DD
3
50 kΩ
10 pF
0.1 µF
www.allegromicro.com
SUPPLY
(3 V BATTERY)
Dwg. EH-013-2
Allegro
7
3209 AND 3210
MICROPOWER,
ULTRA-SENSITIVE
HALL-EFFECT SWITCHES
PACKAGE DESIGNATOR ‘LH’
(fits SC-59A solder-pad layout)
Dimensions in Inches
(for reference only)
Dimensions in Millimeters
(controlling dimensions)
3.10
2.90
0.122
0.114
0.50
0.30
0.020
0.012
0.083
0.073
3
1
2
0.118
0.106
2.10
1.85
0.010
BSC
3
1
2
3.00
2.70
SEATING PLANE
REF
0° TO 8°
0.037
0.006
0.000
SEATING PLANE
0.55
0.010
REF
0.045
0.032
0° TO 8°
0.95
MIN
BSC
BSC
GAUGE PLANE
GAUGE PLANE
0.022
0.25
MIN
BSC
0.0079
0.0050
0.15
0.00
0.20
0.127
1.13
0.87
Dwg. MA-010-3D in
Dwg. MA-010-3D mm
0.028
0.70
3
3
1.00
0.039
2.40
0.094
1
1
2
2
0.95
0.037
Dwg. MA-011-3 mm
Dwg. MA-011-3 in
NOTES: 1. Tolerances on package height and width represent allowable mold offsets. Dimensions given are
measured at the widest point (parting line).
2. Exact body and lead configuration at vendor’s option within limits shown.
3. Height does not include mold gate flash.
4. Where no tolerance is specified, dimension is nominal.
8
0.25
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
3209 AND 3210
MICROPOWER,
ULTRA-SENSITIVE
HALL-EFFECT SWITCHES
PACKAGE DESIGNATOR ‘UA’
Dimensions in Millimeters
(for reference only)
Dimensions in Inches
(controlling dimensions)
0.164
0.159
4.17
4.04
0.062
0.058
45°
1.57
1.47
45°
0.122
0.117
3.10
2.97
45°
45°
0.085
1
2
3
0.031
2.16
1
2
0.79
3
MAX
MAX
0.640
0.600
16.26
15.24
0.0173
0.0138
0.0189
0.0142
SEE NOTE
0.44
0.35
0.48
0.36
SEE NOTE
1.27
0.050
BSC
BSC
Dwg. MH-014E in
NOTES: 1. Tolerances on package height and width represent
allowable mold offsets. Dimensions given are
measured at the widest point (parting line).
2. Exact body and lead configuration at vendor’s option
within limits shown.
3. Height does not include mold gate flash.
4. Recommended minimum PWB hole diameter to clear
transition area is 0.035" (0.89 mm).
5. Where no tolerance is specified, dimension is nominal.
6. Supplied in bulk pack (500 pieces per bag).
Dwg. MH-014E mm
Radial Lead Form (order A32xxEUA-LC)
1
2
3
0.108"
(2.74 mm)
0.620"
0.500"
(15.7 mm
12.7 mm)
0.100"
(2.5 mm)
Dwg. MH-026
NOTE: Lead-form dimensions are the nominals produced on the
forming equipment. No dimensional tolerance is implied or
guaranteed for bulk packaging (500 pieces per bag).
www.allegromicro.com
9
3209 AND 3210
MICROPOWER,
ULTRA-SENSITIVE
HALL-EFFECT SWITCHES
The products described herein are manufactured under one or
more of the following U.S. patents: 5,045,920; 5,264,783; 5,442,283;
5,389,889; 5,581,179; 5,517,112; 5,619,137; 5,621,319; 5,650,719;
5,686,894; 5,694,038; 5,729,130; 5,917,320; and other patents
pending.
Allegro MicroSystems, Inc. reserves the right to make, from time to
time, such departures from the detail specifications as may be
required to permit improvements in the performance, reliability, or
manufacturability of its products. Before placing an order, the user is
cautioned to verify that the information being relied upon is current.
Allegro products are not authorized for use as critical components
in life-support appliances, devices, or systems without express written
approval.
The information included herein is believed to be accurate and
reliable. However, Allegro MicroSystems, Inc. assumes no responsibility for its use; nor for any infringements of patents or other rights of
third parties that may result from its use.
10
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
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