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Description
The A1180, A1181, A1182, and A1183 devices are sensitive,
two-wire, unipolar, Hall effect switches. The operate point, B
OP
,
can be field-programmed, after final packaging of the device
and placement into the application. This advanced feature
allows the optimization of the device switching performance,
by effectively accounting for variations caused by mounting
tolerances for the device and the target magnet.
This family of 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 A1180-83 family
of devices are utilized in sensing: seat track position, seat
belt buckle presence, hood/trunk latching, and shift selector
position.
Two-wire unipolar switches are particularly advantageous
in price-sensitive applications, because they require one less
A1180-DS, Rev. 14
Features and Benefits
? Chopper stabilization
?Low switchpoint drift over operating
  temperature range
?Low sensitivity to stress
? Field programmable for optimized switchpoints
? On-chip protection
?Supply transient protection
?Reverse-battery protection
?On-board voltage regulator
?3.5 to 24 V operation
Sensitive Two-Wire Field-Programmable 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)
A1180, A1181, A1182, and A1183
Amp
Regulator
Low-Pass
Filter
GND
VCC
GND
Package UA Only
0.01 uF
V+
Program/Lock
Programming
Logic
Offset
Clock/Logic
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A1181ELHLT 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:Sensitive Two-Wire Field-Programmable Chopper-Stabilized Unipolar Hall-Effect Switches
A1181ELHLT-T 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:Sensitive Two-Wire Field-Programmable Chopper-Stabilized Unipolar Hall-Effect Switches
A1181EUA 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:Sensitive Two-Wire Field-Programmable Chopper-Stabilized Unipolar Hall-Effect Switches
A1181EUA-T 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:Sensitive Two-Wire Field-Programmable Chopper-Stabilized Unipolar Hall-Effect Switches
A1181LLHLT 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:Sensitive Two-Wire Field-Programmable Chopper-Stabilized Unipolar Hall-Effect Switches
A1181LLHLT-T 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:Sensitive Two-Wire Field-Programmable Chopper-Stabilized Unipolar Hall-Effect Switches