(SOT23W) MICROPOWER, ULTRA-SENSITIVE HALL-EFFECT SWITCH A321
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Package Suffix `LH' Pinning
(SOT23W)
MICROPOWER, ULTRA-SENSITIVE HALL-EFFECT SWITCH
A3212 integrated circuit ultra-sensitive, pole independent Halleffect switch with latched digital output. This sensor especially suited operation battery-operated, hand-held equipment such cellular cordless telephones, pagers, palmtop computers. volt volt operation unique clocking scheme reduce average operating power requirements less than with 2.75 volt supply. Unlike other Hall-effect switches, either north south pole sufficient strength will turn output absence magnetic field, output off. polarity independence minimal power requirement allow these devices easily replace reed switches superior reliability ease manufacturing, while eliminating requirement signal conditioning. Improved stability made possible through chopper stabilization (dynamic offset cancellation), which reduces residual offset voltage normally caused device overmolding, temperature dependencies, thermal stress. This device includes single silicon chip Hall-voltage generator, small-signal amplifier, chopper stabilization, latch, MOSFET output. Advanced BiCMOS processing used take advantage low-voltage low-power requirements, component matching, very input-offset errors, small component geometries. package styles provide magnetically optimized package most applications. Suffix `LH' miniature low-profile surface-mount package while suffix `UA' three-lead ultra-mini-SIP through-hole surface mounting.
Data Sheet 27622.61
GROUND
Dwg. PH-016-1
Pinning shown viewed from branded side.
ABSOLUTE MAXIMUM RATINGS +25°C
Supply Voltage, Magnetic Flux Density, Unlimited Output Voltage, VOUT Output Current, IOUT Junction Temperature, +170°C Operating Temperature Range, Suffix -40°C +85°C Suffix -40°C +150°C Storage Temperature Range, -65°C +170°C
Caution: These CMOS devices have input static protection (Class still susceptible damage exposed extremely high static electrical charges.
OUTPUT
SUPPLY
FEATURES
Micropower Operation Operation With North South Pole Battery Operation Chopper Stabilized Superior Temperature Stability Extremely Switch-Point Drift Insensitive Physical Stress Protected Solid-State Reliability Small Size Easily Manufacturable With Magnet Pole Independence
Always order complete part number: prefix basic four-digit part number suffix indicate operating temperature range suffix indicate package style, e.g., A3212ELH
3212 MICROPOWER, ULTRA-SENSITIVE HALL-EFFECT SWITCHES
FUNCTIONAL BLOCK DIAGRAM
SUPPLY
SWITCH
TIMING LOGIC
DYNAMIC OFFSET CANCELLATION
OUTPUT
SAMPLE HOLD
LATCH
GROUND
Dwg. FH-020-5
Package Suffix `UA' Pinning
(ultra-mini-SIP)
ALLOWABLE PACKAGE POWER DISSIPATION MILLIWATTS
Suffix "UA" 165°C/W
Suffix "LH" 228°C/W
GROUND
AMBIENT TEMPERATURE
Dwg. PH-016
Dwg. GH-046-3B
Pinning shown viewed from branded side.
Northeast Cutoff, 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright 2002 Allegro MicroSystems, Inc.
OUTPUT
SUPPLY
3212 MICROPOWER, ULTRA-SENSITIVE HALL-EFFECT SWITCHES
ELECTRICAL CHARACTERISTICS over operating voltage temperature range (unless otherwise specified).
Limits Characteristic Supply Voltage Range Output Leakage Current Output Voltage Awake Time Period Duty Cycle Chopping Frequency Supply Current Symbol IOFF VOUT tawake tperiod d.c. IDD(EN) IDD(DIS) IDD(AVG) Chip awake (enabled) Chip asleep (disabled) 2.75 Test Conditions Operating1 VOUT BRPN BRPS IOUT 2.75 Min. Typ. 2.75 <1.0 Max. Units
NOTES: Operate release points will vary with supply voltage. BOPx operate point (output turns on); BRPx release point (output turns off). Typical Data +25°C 2.75 design information only.
MAGNETIC CHARACTERISTICS over operating voltage temperature range (unless otherwise specified).
Limits Characteristic Operate Points Symbol BOPS BOPN Release Points BRPS BRPN Hysteresis Bhys Test Conditions South pole branded side North pole branded side South pole branded side North pole branded side |BOPx BRPx| Min. Typ. Max. Units
NOTES: used here, negative flux densities defined less than zero (algebraic convention) less than Typical Data +25°C 2.75 design information only.
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3212 MICROPOWER, ULTRA-SENSITIVE HALL-EFFECT SWITCHES
TYPICAL OPERATING CHARACTERISTICS
SWITCH POINTS
BOPS BRPS
BOPS BRPS
SWITCH POINTS GAUSS
SWITCH POINTS GAUSS
2.75
25°C
BRPN BOPN
BRPN BOPN
Dwg. GH-057-2
AMBIENT TEMPERATURE
Dwg. GH-027-3
SUPPLY VOLTAGE VOLTS
SUPPLY CURRENT
AVERAGE SUPPLY CURRENT
=3.5
AVERAGE SUPPLY CURRENT
=2.75
=2.5
25°C
Dwg. GH-058-7
AMBIENT TEMPERATURE
Dwg. GH-028-11
SUPPLY VOLTAGE VOLTS
Northeast Cutoff, 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000
3212 MICROPOWER, ULTRA-SENSITIVE HALL-EFFECT SWITCHES
CRITERIA DEVICE QUALIFICATION
Allegro sensors subjected stringent qualification requirements prior being released production. become qualified, except destructive tests, failures permitted. Qualification Test Biased Humidity (HAST) High-Temperature Operating Life (HTOL) Accelerated HTOL Test Method Test Conditions 130°C, JESD22-A108, 150°C, 165°C 175°C, 190°C Test Length Samples Comments VOUT VOUT
VOUT
Autoclave, Unbiased
JESD22-A102, Condition 121°C, psig MIL-STD-883, Method 1008, 170°C MIL-STD-883, Method 1010, -65°C +150°C
High-Temperature (Bake) Storage Life Temperature Cycle
1000
cycles
Latch-Up
Pre/Post Reading Pre/Post Reading Pre/Post Reading Pre/Post Reading
Electro-Thermally Induced Gate Leakage ESD, Human Body Model ESD, Machine Model Electrical Distributions
CDF-AEC-Q100-002
test test
Test failure, leads Test failure, leads
JESD22-A115
Specification
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3212 MICROPOWER, ULTRA-SENSITIVE HALL-EFFECT SWITCHES
FUNCTIONAL DESCRIPTION
Average Power. Internal timing circuitry activates sensor deactivates remainder period ms). short "awake" time allows stabilization prior sensor sampling data latching falling edge timing pulse. output during "sleep" time latched last sampled state. supply current affected output state.
PERIOD "AWAKE"
SAMPLE HOLD
IDD(EN)
"SLEEP" SAMPLE OUTPUT LATCHED
Dwg. EH-012-1
IDD(DIS)
Dwg. WH-017-2
Chopper-Stabilized Technique. Hall element considered resistor array similar Wheatstone bridge. large portion offset result mismatching these resistors. These devices proprietary dynamic offset cancellation technique, with internal high-frequency clock reduce residual offset voltage Hall element that normally caused device overmolding, temperature dependencies, thermal stress. chopper-stabilizing technique cancels mismatching resistor circuit changing direction current flowing through Hall plate using CMOS switches Hall voltage measurement taps, while maintaing Hall-voltage signal that induced external magnetic flux. signal then captured sample-andhold circuit further processed using low-offset bipolar circuitry. This technique produces devices that have extremely stable quiescent Hall output voltage, immune thermal stress, have precise recoverability after temperature cycling. relatively high sampling frequency used faster signal processing capability processed. More detailed descriptions circuit operation found Technical Paper 97-10, Monolithic Magnetic Hall Sensor Using Dynamic Quadrature Offset Cancellation Technical Paper 99-1, Chopper-Stabilized Amplifiers With Track-and-Hold Signal Demodulator.
HALL VOLTAGE
Dwg. AH-011-2
Operation. output this device switches (turns when magnetic field perpendicular Hall sensor exceeds operate point BOPS less than BOPN). After turn-on, output capable sinking output voltage VOUT(ON). When magnetic field reduced below release point BRPS increased above BRPN), device output switches high (turns off). difference magnetic operate release points hysteresis (Bhys) device. This built-in hysteresis allows clean switching output even presence external mechanical vibration electrical noise. used here, negative flux densities defined less than zero (algebraic convention) less than
Northeast Cutoff, 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000
3212 MICROPOWER, ULTRA-SENSITIVE HALL-EFFECT SWITCHES
SENSOR LOCATIONS
OUTPUT
(±0.005" [0.13 placement)
OUTPUT VOLTAGE
Package Designator `LH'
ACTIVE AREA DEPTH 0.011" 0.28
0.059" 1.49 0.038" 0.96
BRPN
BRPS
OUTPUT
Dwg. GH-043-1
Dwg. MH-025
MAGNETIC FLUX
Applications. Allegro's pole-independent sensing technique allows operation with either north pole south pole magnet orientation, enhancing manufacturability device. state-of-the-art technology provides same output polarity either pole face. strongly recommended that external bypass capacitor connected close proximity Hall sensor) between supply ground device reduce both external noise noise generated chopper-stabilization technique. This especially true relatively high impedance battery supplies. simplest form magnet that will operate these devices magnet with either pole near branded surface device. Many other methods operation possible. Extensive applications information magnets Hall-effect sensors also available Allegro Electronic Data Book AMS-702 Application Note 27701,
Package Designators `UA', UA-LC', `UA-TL'
ACTIVE AREA DEPTH 0.0195" 0.50
0.081" 2.06
0.057" 1.45
BRANDED SURFACE
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Dwg. MH-011-11A
OUTPUT
Although sensor location accurate three sigma particular design, product improvements result small changes sensor location.
SUPPLY BATTERY)
Dwg. EH-013-2
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Allegro
3212 MICROPOWER, ULTRA-SENSITIVE HALL-EFFECT SWITCHES
PACKAGE DESIGNATOR `LH'
(fits SC-74A solder-pad layout) Dimensions Inches (for reference only)
0.122 0.114 0.020 0.012 0.083 0.073
Dimensions Millimeters (controlling dimensions)
3.10 2.90 0.50 0.30
0.118 0.106
GAUGE PLANE SEATING PLANE
0.020
2.10 1.85
3.00 2.70
GAUGE PLANE SEATING PLANE
0.25
0.022
0.55
0.020
0.037
0.0079 0.0050
0.95
0.20 0.127
0.25
0.006 0.000
0.045 0.032
0.15 0.00
Dwg. MA-010-3C
1.13 0.87
Dwg. MA-010-3C
0.028
0.70 1.00
0.039 0.094
2.40
0.037
Dwg. MA-011-3
0.95
Dwg. MA-011-3
NOTES: Tolerances package height width represent allowable mold offsets. Dimensions given measured widest point (parting line). Exact body lead configuration vendor's option within limits shown. Height does include mold gate flash. Where tolerance specified, dimension nominal.
Northeast Cutoff, 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000
3212 MICROPOWER, ULTRA-SENSITIVE HALL-EFFECT SWITCHES
PACKAGE DESIGNATOR `UA'
Dimensions Inches (controlling dimensions)
0.164 0.159
Dimensions Millimeters (for reference only)
4.17 4.04
0.062 0.058
1.57 1.47
0.122 0.117 0.031
3.10 2.97 0.79
0.085
2.16
0.640 0.600
0.0173 0.0138
16.26 15.24
0.44 0.35
NOTE
0.0189 0.0142
NOTE
0.48 0.36
0.050
Dwg. MH-014E
1.27
Dwg. MH-014E
Radial Lead Form (order A3212xUA-LC)
NOTES: Tolerances package height width represent allowable mold offsets. Dimensions given measured widest point (parting line). Exact body lead configuration vendor's option within limits shown. Height does include mold gate flash. Recommended minimum hole diameter clear transition area 0.035" (0.89 mm). Where tolerance specified, dimension nominal. Supplied bulk pack (500 pieces bag).
0.620" 0.500" (15.7 12.7
0.108" (2.74
0.100" (2.5
Dwg. MH-026
NOTE: Lead-form dimensions nominals produced forming equipment. dimensional tolerance implied guaranteed bulk packaging (500 pieces bag).
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3212 MICROPOWER, ULTRA-SENSITIVE HALL-EFFECT SWITCHES
products described herein manufactured under more 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; other patents pending. Allegro MicroSystems, Inc. reserves right make, from time time, such departures from detail specifications required permit improvements performance, reliability, manufacturability products. Before placing order, user cautioned verify that information being relied upon current. Allegro products authorized critical components life-support appliances, devices, systems without express written approval. information included herein believed accurate reliable. However, Allegro MicroSystems, Inc. assumes responsibility use; infringements patents other rights third parties that result from use.
Northeast Cutoff, 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000
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