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A1266 Schematic ( PDF Datasheet ) - Allegro

Teilenummer A1266
Beschreibung Micropower Ultrasensitive 3D Hall-Effect Switch
Hersteller Allegro
Logo Allegro Logo 




Gesamt 15 Seiten
A1266 Datasheet, Funktion
A1266
Micropower Ultrasensitive 3D Hall-Effect Switch
FEATURES AND BENEFITS
• True 3D sensing
• Omnipolar operation with either north or south pole
• 2.5 to 5.5 V operation
• Low supply current
• High sensitivity, BOP typically 25 G
• Chopper-stabilized offset cancellation
□Superior temperature stability
□Extremely low switchpoint drift
□Insensitive to physical stress
• Solid-state reliability
• Choice of output format
□Separate X, Y, and Z outputs
Combined (X+Y+Z) output
• Tiny SOT-23 packages
PACKAGES:
5-Pin SOT23-W
3-Pin SOT23-W
DESCRIPTION
The A1266 integrated circuit is an ultrasensitive Hall-effect
switch with 3D omnipolar magnetic actuation. The single
silicon chip includes: three Hall plates, multiplexer, small-
signal amplifier, chopper stabilization, Schmitt trigger, and
NMOS output transistors. The device outputs turn on when a
magnetic field of sufficient strength is applied to the sensor
in any orientation. Removal of the magnetic field will turn
the output off.
Two versions of the A1266 offer a choice of output format:
separate X, Y, and Z outputs, or a combined X+Y+Z output.
The low operating supply voltage, 2.5 to 5.5 V, and unique
clocking algorithm assist in reducing the average power
consumption, making it ideal for battery operation (e.g., the
power consumption is less than 25 μW with a 3.3 V supply).
The small geometries of the BiCMOS process allow for
ultrasmall packages suitable for even space-constrained
applications. In this case, a modified SOT23-W surface-mount
package is available in a 3-pin (combined output) or a 5-pin
(separate outputs) configuration, magnetically optimized for
use in a variety of orientations. The packages are lead (Pb) free
and RoHS-compliant, with 100% matte-tin leadframe plating.
Not to scale
VDD
X Hall
Y Hall
Z Hall
Hall
Amp.
To All Subcircuits
Low-Pass
Filter
Sample, Hold &
Averaging
Note for Pin Designations: Triple-Output (Single Output) Options
Functional Block Diagram
A1266-DS, Rev. 2
Output
Logic
OUTX (OUT)
OUTY (n/a)
OUTZ (n/a)
GND






A1266 Datasheet, Funktion
A1266
Micropower Ultrasensitive 3D Hall-Effect Switch
40
TA(ºC)
30 BOPS
20 -40
10 25
0
85
BOPN
-10 -40
-20 25
-30 85
-40
2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
VDD (V)
Average X-Axis Operate Point vs. Supply Voltage
40
VDD(V)
30 BOPS
20 2.5
10 3.3
0
5
BOPN
-10 2.5
-20 3.3
-30 5
-40
-60 -40 -20 0 20 40 60 80 100
TA (ºC)
Average X-Axis Operate Point vs. Ambient Temperature
40
TA(ºC)
30 BOPS
20 -40
10 25
85
0 BOPN
-10 -40
-20 25
-30 85
-40
2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
VDD (V)
Average Y-Axis Operate Point vs. Supply Voltage
40
VDD(V)
30 BOPS
20 2.5
10 3.3
5
0 BOPN
-10 2.5
-20 3.3
-30 5
-40
-60 -40 -20 0 20 40 60 80 100
TA (ºC)
Average Y-Axis Operate Point vs. Ambient Temperature
40
TA(ºC)
30 BOPS
20 -40
10 25
85
0 BOPN
-10 -40
-20 25
-30 85
-40
2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
VDD (V)
Average Z-Axis Operate Point vs. Supply Voltage
40
VDD(V)
30 BOPS
20 2.5
10 3.3
5
0 BOPN
-10 2.5
-20 3.3
-30 5
-40
-60 -40 -20 0 20 40 60 80 100
TA (ºC)
Average Z-Axis Operate Point vs. Ambient Temperature
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
6

6 Page









A1266 pdf, datenblatt
A1266
Micropower Ultrasensitive 3D Hall-Effect Switch
Chopper Stabilization
A limiting factor for switchpoint accuracy when using Hall-effect
technology is the small signal voltage developed across the Hall
plate. This voltage is proportionally small relative to the offset
that can be produced at the output of the Hall sensor. This makes
it difficult to process the signal and maintain an accurate, reliable
output over the specified temperature and voltage range. Chopper
stabilization is a proven approach used to minimize Hall offset.
The Allegro patented technique, dynamic quadrature offset
cancellation, removes key sources of the output drift induced by
temperature and package stress. This offset reduction technique
is based on a signal modulation-demodulation process. Figure 6
illustrates how it is implemented.
The undesired offset signal is separated from the magnetically
induced signal in the frequency domain through modulation. The
subsequent demodulation acts as a modulation process for the
offset, causing the magnetically induced signal to recover its orig-
inal spectrum at baseband while the DC offset becomes a high-
frequency signal. Then, using a low-pass filter, the signal passes
while the modulated DC offset is suppressed. Allegro’s innova-
tive chopper-stabilization technique uses a high-frequency clock.
The high-frequency operation allows a greater sampling rate
that produces higher accuracy, reduced jitter, and faster signal
processing. Additionally, filtering is more effective and results in
a lower noise analog signal at the sensor output. Devices such as
the A1266 that use this approach have an extremely stable quies-
cent Hall output voltage, are immune to thermal stress, and have
precise recoverability after temperature cycling. This technique
is made possible through the use of a BiCMOS process, which
allows the use of low-offset, low-noise amplifiers in combination
with high-density logic and sample-and-hold circuits.
VDD
Amp.
Low-Pass
Filter
Sample, Hold &
Averaging
Figure 6: Model of Chopper-Stabilization Circuit (Dynamic Offset Cancellation)
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
12

12 Page





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