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 +150°C. 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 -40°C to +85°C and ‘L–’ is
-40°C to +150°C. Three package styles provide a magnetically opti-
mized package for most applications. Suffix ‘–LH’ is a miniature
SOT23W low-profile surface-mount package, ‘–LT’ is a miniature
SOT89/TO-243AA transistor package for surface-mount applications;
while suffix ‘–UA’ is a three-lead ultra-mini-SIP for through-hole
mounting.
Data Sheet
27631.50
NC
1
2
X
GROUND
NO (INTERNAL)
CONNECTION
Dwg. PH-003-5
Pinning is shown viewed from branded side.
SUPPLY
FEATURES
ABSOLUTE MAXIMUM RATINGS
at T
A
=+25
°
C
Supply Voltage, V
CC
...........................
27 V
Reverse Battery Voltage, V
RCC
..........
-16 V
Magnetic Flux Density, B ...........
Unlimited
Package Power Dissipation, P
D
.
See Graph
Junction Temperature, T
J
...............
+170
°
C
Operating Temperature Range, T
A
Suffix ‘E–’ ..................
-40
°
C to +85
°
C
Suffix ‘L–’ ................
-40
°
C to +150
°
C
Storage Temperature Range,
T
S
..............................
-65
°
C to +170
°
C
s
s
s
s
s
s
s
s
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
Always order by complete part number: the prefix 'A' + the basic four-digit
part number + a suffix to indicate operating temperature range +
a suffix to indicate package style, e.g.,
A3260ELH .
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-020-4
Suffix Code 'UA' Pinning
(ultra-mini SIP)
Suffix Code 'LT' Pinning
(SOT89/TO-243AA)
X
NC
X
1
2
3
1
2
3
GROUND
GROUND
GROUND
Dwg. PH-003-7A
Dwg. PH-003-6
Pinning is shown viewed from branded side.
2
115 Northeast Cutoff, Box 15036
W
Worcester, Massachusetts 01615-0036 (508) 853-5000
Copyright © 2002, 2003 Allegro MicroSystems, Inc.
NO (INTERNAL)
CONNECTION
SUPPLY
SUPPLY
3260
2-WIRE, CHOPPER-STABILIZED,
PRECISION HALL-EFFECT
BIPOLAR SWITCH
ELECTRICAL CHARACTERISTICS over operating temperature range.
Limits
Characteristic
Supply Voltage
Output Current
Chopping Frequency
Output Slew Rate
Output Settling Time
Reverse Battery Current
Symbol
V
CC
I
GND(L)
I
GND(H)
f
C
di/dt
t
sd
I
CC
C
L
= 20 pF
C
L
= 20 pF
V
RCC
= -16 V
Test Conditions
Operating
B > B
OP
B < B
RP
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/µs
µs
mA
NOTES: 1. B
OP
= operate point (output turns OFF); B
RP
= release point (output turns ON).
2. Typical Data is at T
A
= +25°C and V
CC
= 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
B
OP
B
RP
B
hys
B
OP
- B
RP
Test Conditions
Min.
–
-40
2.0
Typ.
10
-10
20
Max.
40
–
–
Units
G
G
G
NOTES: 1. Typical Data is at T
A
= +25°C and V
CC
= 12 V and is for design information only.
2. 1 gauss (G) is exactly equal to 0.1 millitesla (mT).
www.allegromicro.com
3
3260
2-WIRE, CHOPPER-STABILIZED,
PRECISION HALL-EFFECT
BIPOLAR SWITCH
SENSOR LOCATIONS
ALLOWABLE PACKAGE POWER DISSIPATION in MILLIWATTS
800
700
Suffix "–UA"
R
θJA
= 165°C/W
600
Package Designator “LH”
ACTIVE AREA DEPTH
0.011"
0.28 mm
NOM
0.059"
1.49 mm
3
0.038"
0.96 mm
500
Suffix "–LH"
R
θJA
= 228°C/W
400
Suffix "–LT"
R
θJA
= 180°C/W
300
A
1
2
Dwg. MH-025
200
Suffix "E–"
100
Suffix "L–"
0
20
40
60
100
80
120
AMBIENT TEMPERATURE in
°
C
140
160
180
Dwg. GH-046-2D
Package Designator “LT”
ACTIVE AREA DEPTH
0.0305"
0.775 mm
NOM
0.088"
2.24 mm
0.045"
1.14 mm
A
1
2
3
Allegro
Dwg. MH-008-8A
Package Designators “UA” and "UA-TL"
ACTIVE AREA DEPTH
0.0195"
0.50 mm
NOM
0.080"
2.04 mm
0.056"
1.44 mm
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.
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 repeat-
ability.
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 chopper-
stabilizing 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 (B
RP
). After turn-ON, the
output will source current equal to the device operating current
plus a current source (I
GND(H)
). When the magnetic field is
increased (south pole) above the operate point (B
OP
), the output
will source current equal to the Hall-effect sensor operating
current with the current source turned OFF (I
GND(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 (B
hys
) of the device. The hysteresis allows clean
switching of the output even in the presence of external me-
chanical vibration or electrical noise.
Powering up in the absence of a magnetic field (less than
B
OP
and higher than B
RP
) will allow an indeterminate output
state. The correct state is warranted after the first excursion
beyond B
OP
or B
RP
.
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
I
OUT
+ I
CC
OUTPUT CURRENT
B
RP
B
OP
I
CC
0
-B
0
FLUX DENSITY
+B
Dwg. GH-034-6
www.allegromicro.com
SAMPLE
& HOLD
Dwg. EH-012
5
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