Description
The A1140, A1142, and A1143 devices are sensitive, two-wire,
unipolar, Hall effect switches that are factory-programmed at
end-of-line to optimize 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
A1140/A1142/A1143 family, 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. The
A1140/A1142/A1143 family of switches also features on-chip
A1140-DS, Rev. 17
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
Sensitive 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)
A1140, A1142, and A1143
Amp
Regulator
Low-Pass
Filter
GND
VCC
GND
Package UA Only
0.01 uF
V+
Clock/Logic
To All Subcircuits
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