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A1141 Datasheet Preview

A1141 Datasheet

Sensitive Two-Wire Chopper-Stabilized Unipolar Hall Effect Switches

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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




Allegro

A1141 Datasheet Preview

A1141 Datasheet

Sensitive Two-Wire Chopper-Stabilized Unipolar Hall Effect Switches

No Preview Available !

A1140/41/42/43
Sensitive Two-Wire Chopper-Stabilized Unipolar Hall Effect Switches
V+
VCC
0.01 uF
Functional Block Diagram
Program/Lock
Programming
Logic
Offset
Clock/Logic
Amp
Low-Pass
Filter
Regulator
GND
Package UA Only
GND
Product Selection Guide
Use the complete part numbers when ordering
Part Number
Package
Supply Current at
TA Low Output, ICC(L)
(ºC) (mA)
A1140ELH
A1140EUA
A1140LLH
A1140LUA
Surface Mount
SIP
Surface Mount
SIP
–40 to 85
–40 to 150
2 to 5
A1141ELH
A1141EUA
A1141LLH
A1141LUA
Surface Mount
SIP
Surface Mount
SIP
–40 to 85
–40 to 150
2 to 5
A1142ELH
A1142EUA
A1142LLH
A1142LUA
Surface Mount
SIP
Surface Mount
SIP
–40 to 85
–40 to 150
5 to 6.9
A1143ELH
A1143EUA
A1143LLH
A1143LUA
Surface Mount
SIP
Surface Mount
SIP
–40 to 85
–40 to 150
5 to 6.9
1South (+) magnetic elds must be of sufcient strength.
2Includes north (–) magnetic elds of sufcient strength, and weak elds of either polarity.
Output
South Other
(+) Field1 Field2
Low High
High
Low
Low High
High
Low
A1140-DS
Allegro MicroSystems, Inc.
2
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com


Part Number A1141
Description Sensitive Two-Wire Chopper-Stabilized Unipolar Hall Effect Switches
Maker Allegro
Total Page 11 Pages
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