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부품번호 A1140EUA 기능
기능 Sensitive Two-Wire Chopper-Stabilized Unipolar Hall-Effect Switches
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A1140EUA 데이터시트, 핀배열, 회로
A1140/41/42/43
Sensitive Two-Wire Chopper-Stabilized
Unipolar Hall-Effect Switches
Package LH, 3-pin SOT
3
1. VCC
2. No connection
3. GND
NC
12
Package UA, 3-pin SIP
1. VCC
2. GND
3. GND
PTCT
123
ABSOLUTE MAXIMUM RATINGS
Supply Voltage, VCC .......................................... 28 V
Reverse-Supply Voltage, VRCC ........................ –18 V
Magnetic Flux Density, B .........................Unlimited
Operating Temperature
Ambient, TA, Range E.................. –40ºC to 85ºC
Ambient, TA, Range L................ –40ºC to 150ºC
Maximum Junction, TJ(max)........................165ºC
Storage Temperature, TS .................. –65ºC to 170ºC
The A1140, A1141, A1142, and A1143 devices are sensitive, two-wire, unipo-
lar, Hall effect switches that are factory-programmed at end-of-line to optimize
magnetic switchpoint accuracy. These devices are produced on the Allegro
MicroSystems advanced BiCMOS wafer fabrication process, which implements a
patented, high-frequency, chopper-stabilization technique that achieves magnetic
stability and eliminates the offsets that are inherent in single-element devices
exposed to harsh application environments. Commonly found in a number of
automotive applications, the A1140-43 family of devices are utilized to sense: seat
track position, seat belt buckle presence, hood/trunk latching, and shift selector
position.
Two-wire unipolar switches are particularly advantageous in price-sensitive appli-
cations, because they require one less wire than the more traditional open-collec-
tor output switches. Additionally, the system designer gains inherent diagnostics
because output current normally ows in either of two narrowly-specied ranges.
Any output current level outside of these two ranges is a fault condition. The
A1140-43 family of devices also features on-chip transient protection, and a Zener
clamp to protect against overvoltage conditions on the supply line.
The output currents of the A1141 and A1143 switch HIGH in the presence of a south
polarity magnetic eld of sufcient strength; and switch LOW otherwise, including
when there is no signicant magnetic eld present. The A1140 and A1142 have
inverted output current levels: switching LOW in the presence of a south polarity
magnetic eld of sufcient strength, and HIGH otherwise. The devices also differ in
their specied LOW current supply levels.
All family members are offered in two package styles: SOT-23W, a miniature low-
prole package for surface-mount applications (sufx –LH), and TO-92, three-
lead ultra-mini Single Inline Package (SIP) for through-hole mounting
(sufx –UA).
Field-programmable versions are also available. Refer to: A1180, A1181, A1182,
and A1183.
Features and Benets
Chopper stabilization
Low switchpoint drift over operating tem-
perature range
Low stress sensitivity
Factory programmed at end-of-line for
optimized switchpoints
On-chip protection
Supply transient protection
Reverse-battery protection
On-board voltage regulator
3.5 V to 24 V operation
A1140-DS
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com




A1140EUA pdf, 반도체, 판매, 대치품
A1140/41/42/43
Sensitive Two-Wire Chopper-Stabilized Unipolar Hall Effect Switches
Characteristic Data
ICC(L) versus Ambient Temperature
at Various Levels of VCC
(A1140, A1141, A1142, A1143)
10
8
VCC
6 3.8 V
12.0 V
4 24.0 V
2
0
–40
25
150
Ambient Temperature, TA (°C)
ICC(H) versus Ambient Temperature
at Various Levels of VCC
(A1140, A1141, A1142, A1143)
20
18
VCC
16 3.8 V
12.0 V
14 24.0 V
12
10
–40
25
150
Ambient Temperature, TA (°C)
Switchpoint versus Ambient Temperature
(A1143)
110
105
100
95
90
85
80
75
70
65
60
55
–50
0
50 100 150
Ambient Temperature, TA (°C)
200
Hysteresis versus Ambient Temperature
(A1143)
30
25
20
15
10
5
50
0 50 100 150
Ambient Temperature, TA (°C)
200
A1140-DS
Device Qualication Program
Contact Allegro MicroSystems for information.
EMC (Electromagnetic Compatibility) Requirements
Contact your local representative for EMC results.
Test Name
ESD – Human Body Model
ESD – Machine Model
Conducted Transients
Direct RF Injection
Bulk Current Injection
TEM Cell
Reference Specication
AEC-Q100-002
AEC-Q100-003
ISO 7637-1
ISO 11452-7
ISO 11452-4
ISO 11452-3
Allegro MicroSystems, Inc.
4
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com

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A1140EUA 전자부품, 판매, 대치품
A1140/41/42/43
Sensitive Two-Wire Chopper-Stabilized Unipolar Hall Effect Switches
Chopper Stabilization Technique
When using Hall-effect technology, a limiting factor for switch-
point 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 sensor.
This makes it difcult to process the signal while maintaining an
accurate, reliable output over the specied operating temperature
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 undesired offset signal is separated
from the magnetic eld-induced signal in the frequency domain,
through modulation. The subsequent demodulation acts as a
modulation process for the offset, causing the magnetic eld-
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 lter, while the
modulated dc offset is suppressed.
The chopper stabilization technique uses a 200 kHz high fre-
quency clock. The chopping occurs on each clock edge, result-
ing in a 400 kHz chop frequency. This high-frequency opera-
tion allows a greater sampling rate, which results in higher
accuracy and faster signal-processing capability. This approach
desensitizes the chip to the effects of thermal and mechani-
cal 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 ampli-
ers in combination with high-density logic integration and
sample-and-hold circuits. This process is illustrated in gure 2.
The repeatability of magnetic eld-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. Applica-
tions that are more likely to be sensitive to such degradation
are those requiring precise sensing of alternating magnetic
elds; for example, speed sensing of ring-magnet targets. For
such applications, Allegro recommends its digital sensor fami-
lies with lower sensitivity to jitter. For more information on
those devices, contact your Allegro sales representative.
Regulator
Hall Element
Clock/Logic
Amp
Low-Pass
Filter
Figure 2. Chopper stabilization circuit (dynamic quadrature offset cancellation)
A1140-DS
Allegro MicroSystems, Inc.
7
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com

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A1140EUA

Sensitive Two-Wire Chopper-Stabilized Unipolar Hall-Effect Switches

Allegro MicroSystems
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