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A3260 2-Wire Chopper Stabilized Precision Hall Effect Bipolar Switch
Last Time Buy
These parts are in production but have been determined to be LAST TIME BUY. This classification indicates that the product is obsolete and notice has been given. Sale of this device is currently restricted to existing customer applications. The device should not be purchased for new design applications because of obsolescence in the near future. Samples are no longer available. Date of status change: October 31, 2006 Deadline for receipt of LAST TIME BUY orders: April 27, 2007
Recommended Substitutions:
NOTE: For detailed information on purchasing options, contact your local Allegro field applications engineer or sales representative.
Allegro MicroSystems, Inc. reserves the right to make, from time to time, revisions to the anticipated product life cycle plan for a product to accommodate changes in production capabilities, alternative product availabilities, or market demand. 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 which may result from its use.
3260
Suffix Code 'LH' Pinning
(SOT23W)
3
2-WIRE, CHOPPER-STABILIZED, PRECISION HALL-EFFECT BIPOLAR SWITCH
The A3260-- Hall-effect bipolar switch is an extremely temperature-stable and stress-resistant sensor especially suited for operation over extended temperature ranges to +150C. Superior high-temperature performance is made possible through dynamic offset cancellation, which reduces the residual offset voltage normally caused by device overmolding, temperature dependencies, and thermal stress. The device includes on a single silicon chip a voltage regulator, Hall-voltage generator, small-signal amplifier, chopper stabilization, Schmitt trigger, and a constant-current open-collector output. A south pole of sufficient strength will turn the output OFF. An on-board regulator permits operation with supply voltages of 3.5 to 24 volts. Noise radiation is limited by control of the output current slew rate. The first character of the part number suffix determines the device operating temperature range; suffix `E-' is -40C to +85C and `L-' is -40C to +150C. Two package styles provide a magnetically optimized package for most applications. Suffix `-LH' is a miniature SOT23W low-profile surface-mount package, while suffix `-UA' is a three-lead ultra-mini-SIP for through-hole mounting.
Data Sheet 27631.50d
X
NC
Dwg. PH-003-5
Pinning is shown viewed from branded side.
NO (INTERNAL) CONNECTION
1
2
SUPPLY
GROUND
FEATURES
ABSOLUTE MAXIMUM RATINGS
at TA=+25C Supply Voltage, VCC ........................... 27 V Reverse Battery Voltage, VRCC .......... -16 V Magnetic Flux Density, B ........... Unlimited Package Power Dissipation, PD . See Graph Junction Temperature, TJ ............... +165C Operating Temperature Range, TA Suffix `E-' .................. -40C to +85C Suffix `L-' ................ -40C to +150C Storage Temperature Range, TS .............................. -65C to +170C

Internal Current Regulator for 2-Wire Operation Output Slew Rate Controlled Resistant to Physical Stress Superior Temperature Stability Operation From Unregulated Supply Reverse Battery Protection Solid-State Reliability Small Size
3260 2-WIRE, CHOPPER-STABILIZED, PRECISION HALL-EFFECT BIPOLAR SWITCH
FUNCTIONAL BLOCK DIAGRAM
SUPPLY
REG.
TO ALL SUBCIRCUITS
DYNAMIC OFFSET CANCELLATION
SAMPLE & HOLD
X
LOW-PASS FILTER
GROUND
Dwg. FH-020-
Selection Guide
Part Number1 Pb-Free Packing 2 Mounting Ambient, T A (C) -40 to 85
A3260ELHLT
-
7-in. reel, 3000 pieces/reel
3-pin SOT23W surface mount
A3260EUA
-
Bulk, 500 pieces/bag
3-pin SIP through hole
-40 to 85
1Certain variants cited in this footnote are in production but have been determined to be LAST TIME BUY. This classification indicates that the product is obsolete and notice has been given. Sale of this device is currently restricted to existing customer applications. The variants should not be purchased for new design applications because of obsolescence in the near future. Samples are no longer available. Status date change October 31, 2006. Deadline for receipt of LAST TIME BUY orders is April 27, 2007. These variants include: A3260ELHLT and A3260EUA. Variants A3260LLHLT and A3260LUA are discontinued. 2Contact
Allegro for additional packing options.
2
115 Northeast Cutoff, Box 15036 W Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright (c) 2002, 2006 Allegro MicroSystems, Inc.
3260 2-WIRE, CHOPPER-STABILIZED, PRECISION HALL-EFFECT BIPOLAR SWITCH
ELECTRICAL CHARACTERISTICS over operating supply voltage and temperature ranges.
Limits Characteristic Supply Voltage Output Current Chopping Frequency Output Slew Rate Output Settling Time Reverse Battery Current Symbol VCC IGND(L) IGND(H) fC di/dt tsd ICC CL = 20 pF CL = 20 pF VRCC = -16 V Test Conditions Operating B > BOP B < BRP Min. 3.5 -4.0 -11 - 0.5 -- - Typ. 12 -6.5 -14.5 340 -- -- - Max. 24 -8.0 -18 - 2.0 20 -15 Units V mA mA kHz mA/s s mA
NOTES: 1. BOP = operate point (output turns OFF); BRP = release point (output turns ON). 2. Typical Data is at TA = +25C and VCC = 12 V and is for design information only.
MAGNETIC CHARACTERISTICS over operating supply voltage and temperature ranges.
Limits Characteristic Operate Point Release Point Hysteresis Symbol BOP BRP Bhys BOP - BRP Test Conditions Min. - -40 2.0 Typ. 10 -10 20 Max. 40 - - Units G G G
NOTES: 1. Typical Data is at TA = +25C and VCC = 12 V and is for design information only. 2. 1 gauss (G) is exactly equal to 0.1 millitesla (mT).
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3
3260 2-WIRE, CHOPPER-STABILIZED, PRECISION HALL-EFFECT BIPOLAR SWITCH
SENSOR LOCATIONS
Package Designator "LH"
ACTIVE AREA DEPTH 0.011" 0.28 mm NOM 0.059" 1.49 mm 3 0.038" 0.96 mm
Package Designators "UA"
ACTIVE AREA DEPTH 0.0195" 0.50 mm NOM 0.080" 2.04 mm
0.056" 1.44 mm
A
1 2
Dwg. MH-025
A
BRANDED SURFACE 1 2 3
Dwg. MH-011-9B
Although sensor location is accurate to three sigma for a particular design, product improvements may result in small changes to sensor location.
800
Allegro
Suffix "-UA" R JA = 165C/W
ALLOWABLE PACKAGE POWER DISSIPATION in MILLIWATTS
700
600
500 Suffix "-LH" R JA = 228C/W 400
300
200 Suffix "E-" 100 Suffix "L-" 0 20 40 60 100 80 120 AMBIENT TEMPERATURE in C 140 160 180
Dwg. GH-046-2D
4
115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000
3260 2-WIRE, CHOPPER-STABILIZED, PRECISION HALL-EFFECT BIPOLAR SWITCH
FUNCTIONAL DESCRIPTION
Chopper-Stabilized Technique. 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. 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. 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. The chopperstabilizing technique cancels the mismatching of the resistors by changing the direction of the current flowing through the Hall plate and Hall voltage measurement taps, while maintaining the Hall-voltage signal that is induced by the external magnetic flux. The signal is, then, captured by a sample-and-hold circuit. Operation. The output of these devices turns ON when a magnetic field (north pole) perpendicular to the Hall sensor exceeds the release point threshold (BRP). After turn-ON, the output will source current equal to the device operating current plus a current source (IGND(H)). When the magnetic field is increased (south pole) above the operate point (BOP), the output will source current equal to the Hall-effect sensor operating current with the current source turned OFF (IGND(L)). Note especially that release can occur when the magnetic field is removed but to ensure release, a field reversal is required. The difference in the magnetic operate and release points is the hysteresis (Bhys) of the device. The hysteresis allows clean switching of the output even in the presence of external mechanical vibration or electrical noise. Powering up in the absence of a magnetic field (less than BOP and higher than BRP) will allow an indeterminate output state. The correct state is warranted after the first excursion beyond BOP or BRP. Bipolar switches may switch on removal of field but require field reversal for reliable operation over temperature range; latches will not switch on removal of magnetic field.
REG
X
B +V
--
HALL VOLTAGE
+
Dwg. AH-011-2
+I
IOUT + ICC
OUTPUT CURRENT
BRP
BOP
ICC
0 -B 0 FLUX DENSITY +B
Dwg. GH-034-6
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SAMPLE & HOLD
Dwg. EH-012
5
3260 2-WIRE, CHOPPER-STABILIZED, PRECISION HALL-EFFECT BIPOLAR SWITCH
APPLICATIONS INFORMATION
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.
'UA' PACKAGE
0.95 V
- +
X
3
0.1 F
100 SUPPLY
1
2
Dwg. EH-011-2A
Extensive applications information for Hall-effect sensors is available in: * Hall-Effect IC Applications Guide, Application Note 27701; * Hall-Effect Devices: Soldering, Gluing, Potting, Encapsulating, and Lead Forming, Application Note 27703.1; * Soldering of Through-Hole Hall-Sensor Dervices, Application Note 27703; and * Soldering of Surface-Mount Hall-Sensor Devices, Application Note 27703.2. More detailed descriptions of the chopper-stabilized circuit operation can be found in: * Monolithic Magnetic Hall Sensor Using Dynamic Quadrature Offset Cancelation, Technical Paper STP 97-10; and * Chopper-Stabilized Amplifiers With A Track-and-Hold Signal Demodulator, Technical Paper STP 99-1. All are provided at
www.allegromicro.com
6
115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000
3260 2-WIRE, CHOPPER-STABILIZED, PRECISION HALL-EFFECT BIPOLAR SWITCH
PACKAGE DESIGNATOR 'LH'
(fits SC-59A solder-pad layout) Dimensions in Inches (for reference only) Dimensions in Millimeters (controlling dimensions)
0.122 0.114 0.020 0.012 0.083 0.073
3 1 2
3.10 2.90 0.50 0.30
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 0.0079 0.0050
REF
0.95
BSC
0 TO 8 0.20 0.127
0.25
MIN
0.006 0.000
0.045 0.032
0.15 0.00
Dwg. MA-010-3D in
1.13 0.87
Dwg. MA-010-3D mm
0.028
3
0.70
3
0.039 0.094
1 2
1.00 2.40
1 2
0.037
Dwg. MA-011-3 in
0.95
Dwg. MA-011-3 mm
NOTES: 1. 2. 3. 4. 5.
Tolerances on package height and width represent allowable mold offsets. Dimensions given are measured at the widest point (parting line). Exact body and lead configuration at vendor's option within limits shown. Height does not include mold gate flash. Where no tolerance is specified, dimension is nominal. Add "LT" to part number for tape and reel.
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7
3260 2-WIRE, CHOPPER-STABILIZED, PRECISION HALL-EFFECT BIPOLAR SWITCH
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
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).
8
115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000
3260 2-WIRE, CHOPPER-STABILIZED, PRECISION HALL-EFFECT BIPOLAR SWITCH
Suffix Code 'UA' Pinning
(ultra-mini SIP)
X
1
2
3
SUPPLY
Dwg. PH-003-7A
Pinning is shown viewed from branded side.
GROUND
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.
www.allegromicro.com
GROUND
9

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