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PDF A1266 Data sheet ( Hoja de datos )
| Número de pieza | A1266 | |
| Descripción | Micropower Ultrasensitive 3D Hall-Effect Switch | |
| Fabricantes | Allegro | |
| Logotipo |  |
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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
1 page  
A1266
Micropower Ultrasensitive 3D Hall-Effect Switch
CHARACTERISTIC DATA
40
35
30
TA(ºC)
25
-40
20
15 25
10 85
5
0
2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
VDD (V)
Average Supply Current vs. Supply Voltage
40
35
30
VDD(V)
25
2.5
20
15 3.3
10 5
5
0
-60 -40 -20 0 20 40 60 80 100
TA (ºC)
Average Supply Current vs. Ambient Temperature
500
450
TA(ºC)
X Output
400 -40
350 25
300 85
250 Y and Z
200 -40
150 25
100 85
50
0
2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
VDD (V)
Average Low Output Voltage vs. Supply Voltage
500
450
VDD(V)
X Output
400 2.5
350
3.3
300
5
250
200 Y and Z
150 2.5
100 3.3
50 5
0
-60 -40 -20 0 20 40 60 80 100
TA (ºC)
Average Low Output Voltage vs. Ambient Temperature
IOUT = 20 mA
300
250
200
150
100
50
0
2.0
TA(ºC)
-40
25
85
2.5 3.0 3.5 4.0 4.5 5.0 5.5
VDD (V)
Average Period vs. Supply Voltage
300
250
200 VDD(V)
2.5
150
3.3
100
5
50
0
-60 -40 -20 0 20 40 60 80 100
TA (ºC)
Average Period vs. Ambient Temperature
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
5
5 Page 
A1266
Micropower Ultrasensitive 3D Hall-Effect Switch
Typical Application Circuits
A1266ELHLT-SO3-T AND A1266ELHLX-SO3-T
For sensors configured with the single output option, one pin
reports the output state from any of the three Hall elements.
VS
CBYP
0.1 µF
VDD
A1266
OUT
GND
RLOAD
Sensor
Output
GND
Figure 4: Typical Application Circuit for the Single Output Selection
A1266ELHLT-T AND A1266ELHLX-T
For sensors configured with the triple output option, the three
separate open drain outputs report the output state from the cor-
responding Hall elements.
VS
CBYP
0.1 µF
VDD
A1266
OUTX
OUTY
OUTZ
GND
RLOAD RLOAD RLOAD
Sensor
Outputs
GND
Figure 5: Typical Application Circuit for the Triple Output Selection
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
11
11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet A1266.PDF ] | |
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