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PDF A1160 Data sheet ( Hoja de datos )
| Número de pieza | A1160 | |
| Descripción | Chopper-Stabilized Precision Hall Effect Switch | |
| Fabricantes | Allegro | |
| Logotipo |  |
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A1160
Chopper-Stabilized Precision Hall-Effect Switch
With Advanced Diagnostics
Features and Benefits
• AEC-Q100 automotive qualified
• Unipolar switchpoints
• Externally enabled diagnostics feature
• Diagnostics feature exercises the entire magnetic and
electrical signal path within the IC
• Resistant to physical stress
• Superior temperature stability through advanced chopper
stabilization techniques
• Output short-circuit protection
• Internal regulator enables operation from unregulated
supplies
• Reverse-battery protection
• Solid-state reliability
• Small surface-mount package
Package: 5-pin SOT23W (suffix LH)
Approximate footprint
Description
The A1160 is a unipolar, Hall-effect switch with an externally
enabled diagnostic function. In normal operating mode, the
A1160 functions as a standard, unipolar Hall-effect switch.
The output transistor turns on (output signal switches low)
in the presence of a sufficient magnetic field (>BOP(max)).
Additionally, the output transistor of the A1160 switches
off (output signal switches high) when the magnetic field is
removed (< BRP(min)).
The A1160 includes conductive coils in close proximity to the
Hall element. When the diagnostic feature is enabled, these
coils are energized. The energized coils generate an internal
magnetic field that can be sensed by the Hall element. While
in Diagnostic mode, the output of the A1160 provides a square
wave output, which confirms the IC is properly sensing the
internally generated magnetic field. The Diagnostic mode
exercises the entire magnetic and electrical signal path internal
to the IC, fully confirming functionality. Therefore, use of the
A1160 either eliminates the need for redundant sensors in safety
critical applications or increases robustness in safety critical
applications that require redundant sensors (drive-by-wire
systems and so forth).
The A1160 Hall-effect sensor IC is extremely temperature-
stable and stress-resistant, especially suited for operation
Continued on the next page…
VCC
DIAG
Functional Block Diagram
Regulator
VREG
Hall
Element
To all subcircuits
Amplifier
Signal
Recovery
Threshold
Normal
Diagnostic
System Diagnostics
Control
Current
Limit
VOUT
A1160-DS, Rev. 1
GND
1 page  
A1160
Chopper-Stabilized Precision Hall-Effect Switch
With Advanced Diagnostics
Thermal Characteristics: may require derating at maximum conditions; see application information
Characteristic
Symbol
Test Conditions*
Package Thermal Resistance
RθJA On 4-layer PCB based on JEDEC standard
*Additional thermal information available on the Allegro website
Value Unit
124 ºC/W
Power Derating Curve
25
24 VCC(max)
23
22
21
20
Normal Mode
(ICC(max) = 5 mA)
19
18
17
16
15
14
Diagnostic Mode
(ICC(max) = 25 mA)
13
12
11
10
9
8
7
6
5
4
3
VCC(min)
2
20 40 60 80 100 120 140 160 180
Temperature (ºC)
Power Dissipation versus Ambient Temperature
1900
1800
1700
1600
1500
1400
1300
Diagnostic Mode (ICC(max) = 25 mA)
Normal Mode (ICC(max) = 5 mA)
1200
1100
1000
900
800
700
600
500
400
300
200
100
0
20 40 60 80 100 120 140 160 180
Temperature (°C)
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
5
5 Page 
A1160
Chopper-Stabilized Precision Hall-Effect Switch
With Advanced Diagnostics
Chopper Stabilization Technique
When using Hall-effect technology, a limiting factor for
switchpoint accuracy is the small signal voltage developed across
the Hall element. This voltage is disproportionally small relative
to the offset that can be produced at the output of the Hall IC.
This makes it difficult to process the signal while maintaining an
accurate, reliable output across the specified operating tempera-
ture and voltage ranges.
Chopper stabilization is a unique approach used to minimize
Hall offset on the chip. The patented Allegro technique, namely
Dynamic Quadrature Offset Cancellation, removes key sources
of the output drift induced by thermal and mechanical stresses.
This offset reduction technique is based on a signal modulation-
demodulation process. The unwanted offset signal is separated
from the magnetic field-induced signal in the frequency domain,
through modulation. The subsequent demodulation acts as a
modulation process for the offset, causing the magnetic field
induced signal to recover its original spectrum at baseband, while
the DC offset becomes a high-frequency signal. The magnetic
sourced signal then can pass through a low-pass filter, while the
modulated DC offset is suppressed. This configuration is illus-
trated in figure 4.
The chopper stabilization technique uses a 400 kHz, high
frequency clock. For demodulation process, a sample-and-hold
technique is used, where the sampling is performed at twice the
chopper frequency (800 kHz). This high-frequency operation
allows a greater sampling rate, which results in higher accuracy
and faster signal-processing capability. This approach desensi-
tizes the chip to the effects of thermal and mechanical stresses,
and produces devices that have extremely stable quiescent Hall
output voltages and 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 integration and
sample-and-hold circuits.
The repeatability of magnetic field-induced switching is affected
slightly by a chopper technique. However, the Allegro high
frequency chopping approach minimizes the affect of jitter and
makes it imperceptible in most applications. Applications that are
more likely to be sensitive to such degradation are those requiring
precise sensing of alternating magnetic fields; for example, speed
sensing of ring-magnet targets. For such applications, Allegro
recommends its digital sensor IC families with lower sensitivity
to jitter. For more information on those products, contact your
Allegro sales representative.
Regulator
Hall Element
Clock/Logic
Amp
Low-Pass
Filter
Figure 4. Chopper stabilization circuit (Dynamic Quadrature Offset Cancellation)
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 13 Páginas | |
| PDF Descargar | [ Datasheet A1160.PDF ] | |
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