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Description
The A1147 and A1148 devices are two-wire, unipolar, Hall
effect switches that are factory-programmed at end-of-line to
optimize ultrasensitive magnetic switchpoint accuracy. These
devices use a patented high frequency chopper-stabilization
technique, produced using the Allegro advanced BiCMOS
wafer fabrication process, to achieve magnetic stability and
to eliminate offset inherent in single-element devices exposed
to harsh application environments.
Commonly found in a number of automotive applications,
these switches are utilized in sensing seat track position, seat
belt buckle presence, hood/trunk latching, and shift selector
position. Two-wire unipolar switches, such as the A1147
and A1148, are particularly advantageous in price-sensitive
applications because they require one less wire for operation
than do switches with the more traditional open-collector output.
Additionally, the system designer inherently gains diagnostics
because there is always output current flowing, which should
be in either of two narrow ranges. Any current level not within
these ranges indicates a fault condition. These devices also
A1147-DS, Rev. 12
Features and Benefits
? Chopper stabilization
?Low switchpoint drift over operating
  temperature range
?Low sensitivity to stress
? Factory programmed at end-of-line for optimized
switchpoints
? On-chip protection
?Supply transient protection
?Reverse-battery protection
?On-board voltage regulator
?3.5 to 24 V operation
Low Current Ultrasensitive Two-Wire Chopper-Stabilized
Unipolar Hall Effect Switches
Continued on the next page&
Functional Block Diagram
Not to scale
Packages: 3 pin SOT23W (suffix LH), and
3 pin SIP (suffix UA)
A1147 and A1148
Amp
Regulator
Low-Pass
Filter
GND
VCC
GND
Package UA Only
0.01 uF
V+
Clock/Logic
To All Subcircuits
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相关代理商/技术参数
A1148LUATI 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:Low Current Ultrasensitive Two-Wire Chopper-Stabilized Unipolar Hall Effect Switches
A1148LUATI-T 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:Low Current Ultrasensitive Two-Wire Chopper-Stabilized Unipolar Hall Effect Switches
A11490 功能描述:大功率LED - 单色 Amber 590nm 5 Watt RoHS:否 制造商:Cree, Inc. 照明颜色:Blue 波长:465 nm 光强度: 光通量/辐射通量:500 mW 正向电流:350 mA 正向电压:3.1 V 安装风格:SMD/SMT 功率额定值: 系列:XB-D 封装:Reel
A114A 制造商:General Electric Company 功能描述: 制造商:Advanced Semiconductor Inc 功能描述:Rectifier Diode, 100 Volt, Axial-B 制造商:SIGNAL DIODE 功能描述:Rectifier Diode, 100 Volt, Axial-B
A11-4A 制造商:Honeywell Sensing and Control 功能描述:
A114AX9 制造商:Rochester Electronics LLC 功能描述:- Bulk
A114C 制造商:Rochester Electronics LLC 功能描述:- Bulk
A114D 制造商:Rochester Electronics LLC 功能描述:- Bulk