A3213EUA-LC-T [ALLEGRO]
Sensor/Transducer, Open-drain, BICMOS, 3 Pin, Plastic/epoxy,;
| 型号： | A3213EUA-LC-T |
| 厂家： | 
ALLEGRO MICROSYSTEMS |
| 描述： | Sensor/Transducer, Open-drain, BICMOS, 3 Pin, Plastic/epoxy, 信息通信管理 |
| 文件： | 总11页 (文件大小：289K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
3213 AND
3214
MICROPOWER, ULTRA-SENSITIVE
HALL-EFFECT SWITCHES
The A3213xx and A3214xx 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. A 2.4 volt
to 5.5 volt operation and a unique clocking scheme reduce the average oper-
ating power requirements – the A3213xx to 825 μW, the A3214xx to 14 μW
(typical at 2.75 V)! Except for operating duty cycle and average operating
current, the A3213xx and A3214xx are identical.
Package Designator ‘LH’ Pinning
(SOT23W)
3
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.
V
DD
Improved stability is made possible through chopper stabilization (dy-
namic offset cancellation), which reduces the residual offset voltage normally
caused by device overmolding, temperature dependencies, and thermal stress.
1
2
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.
Dwg. PH-016-1
Range 'E' devices are rated for operation over a temperature range of
-40°C to +85°C; range 'L' devices are rated for operation over a temperature
range of -40°C to +150°C. Two package styles provide a magnetically opti-
mized 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 available in a lead (Pb) free version (suffix, –T) , with a 100% matte
tin plated leadframe.
Pinning is shown viewed from branded side.
ABSOLUTE MAXIMUM RATINGS
at T = +25°C
A
Supply Voltage, VDD .............................. 6 V
Magnetic Flux Density, B .......... Unlimited
Output Off Voltage, VOUT ...................... 6 V
Output Current, IOUT ........................... 1 mA
Junction Temperature, TJ ................ +170°C
FEATURES
■ Micropower Operation
■ Operate With North or South Pole
■ 2.4 V to 5.5 V Battery Operation
■ Chopper Stabilized
Superior Temperature Stability
Extremely Low Switch-Point Drift
Insensitive to Physical Stress
Operating Temperature Range, TA
Range 'E' ...................... -40°C to +85°C
Range 'L' ................... -40°C to +150°C
■ High ESD protection
■ Solid-State Reliability
Storage Temperature Range,
TS .............................. -65°C to +170°C
■ Small Size
■ Easily Manufacturable With Magnet Pole Independence
3213 AND 3214
MICROPOWER,
ULTRA-SENSITIVE
HALL-EFFECT SWITCHES
Product Selection Guide
Ambient, TA
DC
(%)
IDDAVG(TYP)
Part Number
Pb-free
Packing1
Mounting
(ºC)
(μA)
A3213ELHLT2
A3213ELHLT-T
A3213EUA2
–
Yes
–
7-in. reel
3000 pieces/reel
Surface Mount
–40 to 85
Bulk
500 pieces/bag
SIP through hole
Surface Mount
SIP through hole
Surface Mount
SIP through hole
Surface Mount
SIP through hole
A3213EUA-T
A3213LLHLT2
A3213LLHLT-T
A3213LUA2
Yes
–
25
460
7-in. reel
3000 pieces/reel
Yes
–
–40 to 150
–40 to 85
–40 to 150
Bulk
500 pieces/bag
A3213LUA-T
A3214ELHLT2
A3214ELHLT-T
A3214EUA2
Yes
–
7-in. reel
3000 pieces/reel
Yes
–
Bulk
500 pieces/bag
A3214EUA-T
A3214LLHLT2
A3214LLHLT-T
A3214LUA2
Yes
–
0.10
11
7-in. reel
3000 pieces/reel
Yes
–
Bulk
500 pieces/bag
A3214LUA-T
Yes
1Contact Allegro for additional packing options.
2These variants are in production but have been determined to be NOT FOR NEW DESIGN. This classification indicates that sale of this device is
currently 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 change: May 1, 2006.
115 Northeast Cutoff, Box 15036
2
Worcester, Massachusetts 01615-0036 (508) 853-5000
3213 AND 3214
MICROPOWER,
ULTRA-SENSITIVE
HALL-EFFECT SWITCHES
FUNCTIONAL BLOCK DIAGRAM
Package Designator ‘UA’ Pinning
(SIP)
NOTE – Allowable package power dissipation will not be exceeded un-
less Absolute Maximum Ratings (page 1) are exceeded.
Pinning is shown viewed from branded side.
www.allegromicro.com
3
Copyright © 2003 Allegro MicroSystems, Inc.
3213 AND 3214
MICROPOWER,
ULTRA-SENSITIVE
HALL-EFFECT SWITCHES
ELECTRICAL CHARACTERISTICS: unless otherwise noted
over operating voltage and temperature range.
Limits
Typ.
Characteristic
Supply Voltage Range
Output Leakage Current
Output On Voltage
Awake Time
Symbol
VDD
Test Conditions
Min.
2.4
–
Max.
5.5
1.0
300
90
Units
V
Operating1)
3.0
<1.0
100
60
IOFF
VOUT = 5.5 V, BRPN < B < BRPS
IOUT = 1 mA, VDD = 3.0 V
μA
mV
μs
VOUT
tawake
tperiod
–
–
Period
A3213xx
A3214xx
A3213xx
A3214xx
–
240
60
360
90
μs
–
ms
%
Duty Cycle
d.c.
–
25
–
–
0.10
340
–
–
%
Chopping Frequency
Supply Current
fC
–
–
kHz
mA
μA
μA
μA
IDD(EN)
IDD(DIS)
IDD(AVG)
Chip awake (enabled)
Chip asleep (disabled)
A3213xx
–
2.0
8.0
700
15
–
–
–
460
11
A3214xx
–
2. BOPx = operate point (output turns ON); BRPx = release point (output turns OFF).
3. Typical Data is at TA = +25°C and VDD = 3.0 V and is for design information only.
MAGNETIC CHARACTERISTICS: over operating voltage and temperature range.
Limits
Characteristic
Operate Points
BOPN
Symbol
Test Conditions
Min.
–
Typ.
42
Max.
70
–
Units
G
BOPS
South pole to branded side
North pole to branded side
-70
10
–
-48
32
G
Release Points
BRPN
BRPS
South pole to branded side
–
G
North pole to branded side
-38
10
-10
–
G
Hysteresis
Bhys
|BOPx - BRPx
|
–
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. BOPx = operate point (output turns ON); BRPx = release point (output turns OFF).
3. Typical Data is at TA = +25°C and VDD = 3.0 V and is for design information only.
4. 1 gauss (G) is exactly equal to 0.1 millitesla (mT).
115 Northeast Cutoff, Box 15036
4
Worcester, Massachusetts 01615-0036 (508) 853-5000
3213 AND 3214
MICROPOWER,
ULTRA-SENSITIVE
HALL-EFFECT SWITCHES
TYPICAL OPERATING CHARACTERISTICS
as a function of temperature (VDD = 3 V)
TEMPERATURE, TA (°C)
A3213xx
A3214xx
TEMPERATURE, TA (°C)
TEMPERATURE, TA (°C)
TEMPERATURE, TA (°C)
www.allegromicro.com
5
3213 AND 3214
MICROPOWER,
ULTRA-SENSITIVE
HALL-EFFECT SWITCHES
TYPICAL OPERATING CHARACTERISTICS
as a function of supply voltage (TA = 25°C)
SUPPLY VOLTAGE, VDD (V)
A3213xx
A3214xx
SUPPLY VOLTAGE, VDD (V)
SUPPLY VOLTAGE, VDD (V)
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
6
3213 AND 3214
MICROPOWER,
ULTRA-SENSITIVE
HALL-EFFECT SWITCHES
FUNCTIONAL DESCRIPTION
Low Average Power. Internal timing circuitry activates the
sensor for 60 μs and deactivates it for the remainder of the
period (240 μs for the A3213xx and 60 ms for the A3214xx). A
short "awake" time allows for stabilization prior to the sensor
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.
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 cancel-
lation 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-and-hold 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.
Operation. The output of this device switches low (turns on)
when a magnetic field perpendicular to the Hall sensor 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 pres-
ence of external mechanical vibration and electrical noise.
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.
As used here, negative flux densities are defined as less than
zero (algebraic convention) and -50 G is less than +10 G.
Applications. Allegro's pole-independent sensing technique
www.allegromicro.com
7
3213 AND 3214
MICROPOWER,
Allegro
ULTRA-SENSITIVE
HALL-EFFECT SWITCHES
SENSOR LOCATIONS
Package Designator ‘LH’
allows for operation with either a north pole or south pole mag-
net orientation, enhancing the manufacturability of the device.
The state-of-the-art technology provides the same output polarity
for either pole face.
Package Designator ‘UA’
It is strongly recommended that an external bypass capacitor
be connected (in close proximity to the Hall sensor) 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. Exten-
sive applications information on magnets and Hall-effect sensors
is also available in the Allegro Electronic Data Book AMS-702
or Application Note 27701, or at
www.allegromicro.com
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
8
3213 AND 3214
MICROPOWER,
ULTRA-SENSITIVE
HALL-EFFECT SWITCHES
PACKAGE DESIGNATOR ‘LH’
(SOT23W, fits SC-59A solder-pad layout)
Dimensions in Inches
(for reference only)
Dimensions in Millimeters
(controlling dimensions)
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.
5. Add "LT" to part number for tape and reel.
www.allegromicro.com
9
3213 AND 3214
MICROPOWER,
ULTRA-SENSITIVE
HALL-EFFECT SWITCHES
PACKAGE DESIGNATOR ‘UA’
Dimensions in Millimeters
Dimensions in Inches
(controlling dimensions)
(for reference only)
Radial Lead Form (order A321xxUA-LC)
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).
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).
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
10
3213 AND 3214
MICROPOWER,
ULTRA-SENSITIVE
HALL-EFFECT SWITCHES
The products described herein are manufactured under one or more
of the following U.S. patents: 4,761,569; 5,619,137; 5,621,319. In
addition, a patent is pending for Allegro's magnetic pole-independent
feature. Allegro has several foreign counterpart patents as well. Allegro
has not licensed any of these patents to any third party.
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 manufactur-
ability 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 reli-
able. 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.
www.allegromicro.com
11
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