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3213 AND 3214
Package Designator `LH' Pinning
(SOT23W)
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 operating power requirements - the A3213xx to 825 W, the A3214xx to 14 W (typical at 2.75 V)! Except for operating duty cycle and average operating current, the A3213xx and A3214xx 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. Range 'E' devices are rated for operation over a temperature range of -40C to +85C; range 'L' devices are rated for operation over a temperature range of -40C to +150C. Two package styles provide a magnetically optimized package for most applications. `LH' is a miniature low-profile surfacemount 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.
Data Sheet 27622.62F
3
V
DD
1 SUPPLY GROUND
2 OUTPUT
Dwg. PH-016-1
Pinning is shown viewed from branded side.
ABSOLUTE MAXIMUM RATINGS
at TA = +25C Supply Voltage, VDD .............................. 6 V Magnetic Flux Density, B .......... Unlimited Output Off Voltage, VOUT ...................... 6 V Output Current, IOUT ........................... 1 mA Junction Temperature, TJ ................ +170C Operating Temperature Range, TA Suffix 'E' ...................... -40C to +85C Suffix 'L' ................... -40C to +150C Storage Temperature Range, TS .............................. -65C to +170C
Caution: These CMOS devices have input static protection (Class 3) but are still susceptible to damage if exposed to extremely high static electrical charges.
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 ESD Protected to 5 kV Solid-State Reliability Small Size Easily Manufacturable With Magnet Pole Independence
3213 AND 3214 MICROPOWER, ULTRA-SENSITIVE HALL-EFFECT SWITCHES
Product Selection Guide
Part Number A3213ELHLT A3213ELHLT-T A3213EUA A3213EUA-T A3213LLHLT A3213LLHLT-T A3213LUA A3213LUA-T A3214ELHLT A3214ELHLT-T A3214EUA A3214EUA-T A3214LLHLT A3214LLHLT-T A3214LUA A3214LUA-T Pb-free - Yes - Yes - Yes - Yes - Yes - Yes - Yes - Yes Packing* 7-in. reel 3000 pieces/reel Bulk 500 pieces/bag 7-in. reel 3000 pieces/reel Bulk 500 pieces/bag 7-in. reel 3000 pieces/reel Bulk 500 pieces/bag 7-in. reel 3000 pieces/reel Bulk 500 pieces/bag Mounting Surface Mount -40 to 85 SIP through hole 25 Surface Mount -40 to 150 SIP through hole Surface Mount -40 to 85 SIP through hole 0.10 Surface Mount -40 to 150 SIP through hole 11 460 Ambient, TA (C) DC (%) IDDAVG(TYP) (A)
*Contact Allegro for additional packing options.
2
115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000
3213 AND 3214 MICROPOWER, ULTRA-SENSITIVE HALL-EFFECT SWITCHES
FUNCTIONAL BLOCK DIAGRAM
SUPPLY
SWITCH
TIMING LOGIC
DYNAMIC OFFSET CANCELLATION
OUTPUT
SAMPLE & HOLD
LATCH
X
GROUND
Dwg. FH-020-5
800
ALLOWABLE PACKAGE POWER DISSIPATION in MILLIWATTS
Package Designator `UA' Pinning
(SIP)
PACKAGE SUFFIX "UA" RJA = 165C/W
700
500 PACKAGE SUFFIX "LH" RJA = 228C/W 400
V
DD
300
1
200 TEMP. CODE "E"
X
2
600
3
GROUND
100 TEMP. CODE "L" 0 20 40 60 80 120 100 AMBIENT TEMPERATURE in C 140 160 180
Dwg. GH-046-9
NOTE - Allowable package power dissipation will not be exceeded unless Absolute Maximum Ratings (page 1) are exceeded.
Dwg. PH-016
Pinning is shown viewed from branded side.
3
115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright (c) 2003 Allegro MicroSystems, Inc.
OUTPUT
SUPPLY
3213 AND 3214 MICROPOWER, ULTRA-SENSITIVE HALL-EFFECT SWITCHES
ELECTRICAL CHARACTERISTICS: unless otherwise noted over operating voltage and temperature range.
Limits Characteristic Supply Voltage Range Output Leakage Current Output On Voltage Awake Time Period Symbol VDD IOFF VOUT tawake tperiod A3213xx A3214xx Duty Cycle d.c. A3213xx A3214xx Chopping Frequency Supply Current fC IDD(EN) IDD(DIS) IDD(AVG) Chip awake (enabled) Chip asleep (disabled) A3213xx A3214xx ESD, Human Body Model ESD, Machine Model - - Per CDF-AEC-Q100-002 Per JESD22-A115 Test Conditions Operating1) VOUT = 5.5 V, BRPN < B < BRPS IOUT = 1 mA, VDD = 3.0 V Min. 2.4 - - - - - - - - - - - - 5.0 350 Typ. 3.0 <1.0 100 60 240 60 25 0.10 340 - - 460 11 - - Max. 5.5 1.0 300 90 360 90 - - - 2.0 8.0 850 22 - - Units V A mV s s ms % % kHz mA A A A kV V
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 = +25C and VDD = 3.0 V and is for design information only.
MAGNETIC CHARACTERISTICS: over operating voltage and temperature range.
Limits Characteristic Operate Points Symbol BOPS BOPN Release Points BRPS BRPN Hysteresis Bhys Test Conditions South pole to branded side North pole to branded side South pole to branded side North pole to branded side |BOPx - BRPx| Min. - -70 10 - - Typ. 42 -48 32 -38 10 Max. 70 - - -10 - Units G G G G 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 = +25C and VDD = 3.0 V and is for design information only. 4. 1 gauss (G) is exactly equal to 0.1 millitesla (mT).
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4
3213 AND 3214 MICROPOWER, ULTRA-SENSITIVE HALL-EFFECT SWITCHES
TYPICAL OPERATING CHARACTERISTICS as a function of temperature (VDD = 3 V)
SWITCH POINTS, B (G)
TEMPERATURE, TA (C)
A3213xx
AVG, SUPPLY CURRENT, IDD (A) AVG, SUPPLY CURRENT, IDD (A)
A3214xx
TEMPERATURE, TA (C)
TEMPERATURE, TA (C)
OUTPUT ON VOLTAGE, VOUT (mV)
TEMPERATURE, TA (C)
5
115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000
3213 AND 3214 MICROPOWER, ULTRA-SENSITIVE HALL-EFFECT SWITCHES
TYPICAL OPERATING CHARACTERISTICS as a function of supply voltage (TA = 25C)
SWITCH POINTS, B (G)
SUPPLY VOLTAGE, VDD (V)
A3213xx
AVG, SUPPLY CURRENT, IDD (A) AVG, SUPPLY CURRENT, IDD (A)
A3214xx
SUPPLY VOLTAGE, VDD (V)
SUPPLY VOLTAGE, VDD (V)
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6
3213 AND 3214 MICROPOWER, ULTRA-SENSITIVE HALL-EFFECT SWITCHES
FUNCTIONAL DESCRIPTION
Low Average Power. Internal timing circuitry activates the sensor for 60 s and deactivates it for the remainder of the period (240 s 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.
PERIOD 60 s - "AWAKE"
+V
SAMPLE & HOLD
X
IDD(EN)
"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-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. 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.
--
HALL VOLTAGE
+
Dwg. AH-011-2
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 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.
7
115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000
Allegro
3213 AND 3214 MICROPOWER, ULTRA-SENSITIVE HALL-EFFECT SWITCHES
SENSOR LOCATIONS
5V MAX OUTPUT OFF B OPN B OPS
OUTPUT VOLTAGE
Package Designator `LH'
ACTIVE AREA DEPTH 0.011" 0.28 mm NOM
0.059" 1.51 mm 3 0.046" 0.85 mm
BRPN 0 -B 0
BRPS
OUTPUT ON
+B
Dwg. GH-043-1
MAGNETIC FLUX
A
1 2
Dwg. MH-025-1
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 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. Extensive 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
Package Designator `UA'
ACTIVE AREA DEPTH 0.0195" 0.50 mm NOM
0.081" 2.07 mm
A
BRANDED SURFACE
0.053" 1.33 mm
1
2
3
www.allegromicro.com
Dwg. MH-011-12
OUTPUT 10 pF
2
DD
50 k
3
V
1
www.allegromicro.com
X
SUPPLY (3 V BATTERY) 0.1 F
Dwg. EH-013-2
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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)
0.122 0.114
Dimensions in Millimeters (controlling dimensions)
3.10 2.90
0.50 0.30
0.020 0.012 0.083 0.073
3
1
2
0.118 0.106
GAUGE PLANE SEATING PLANE
0.010
BSC
2.10 1.85
3
1 2
3.00 2.70
GAUGE PLANE SEATING PLANE
0.25
BSC
0.022
REF
0.55
0.010
MIN
0.037
BSC
0 TO 8
REF
0.95
BSC
0 TO 8
0.20 0.127
0.25
MIN
0.006 0.000
0.045 0.032
0.0079 0.0050
0.15 0.00
Dwg. MA-010-3D in
1.13 0.87
Dwg. MA-010-3D mm
0.028
3
3
0.70 1.00
0.039 0.094
1 2
2.40
1 2
0.037
Dwg. MA-011-3 in
0.95
Dwg. MA-011-3 mm
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.
9
115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000
3213 AND 3214 MICROPOWER, ULTRA-SENSITIVE HALL-EFFECT SWITCHES
PACKAGE DESIGNATOR `UA'
Dimensions in Inches (controlling dimensions)
0.164 0.159
Dimensions in Millimeters (for reference only)
4.17 4.04
45
0.062 0.058
45
1.57 1.47
0.122 0.117 45 0.031
3.10 2.97 45 0.79
0.085
MAX
1
2
3
2.16
MAX
1
2
3
0.640 0.600
0.0173 0.0138
16.26 15.24
0.44 0.35
SEE NOTE
0.0189 0.0142
SEE NOTE
0.48 0.36
0.050
BSC
Dwg. MH-014E in
1.27
BSC
Dwg. MH-014E mm
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).
1
2
3
0.620" 0.500" (15.7 mm 12.7 mm)
0.108" (2.74 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
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 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.
11
115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000

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