A1157(2012) 데이터 시트보기 (PDF) - Allegro MicroSystems
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A1157 Datasheet PDF : 12 Pages
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A1150, A1152, A1153, A1155, A1156, A1157, and A1158
Chopper-Stabilized, Two Wire Hall-Effect Switches
Features and Benefits
▪ High speed, 4-phase chopper stabilization
▪ Low switchpoint drift throughout temperature range
▪ Low sensitivity to thermal and mechanical stresses
▪ On-chip protection
▫ Supply transient protection
▫ Reverse battery protection
▫ On-board voltage regulator
▫ 3.0 to 24 V operation
▪ Solid-state reliability
▪ Robust EMC and ESD performance
▪ Industry leading ISO 7637-2 performance through use of
proprietary, 40-V clamping structures
Packages
3-pin SOT23-W
2 mm × 3 mm × 1 mm
(suffix LH)
3-pin ultramini SIP
1.5 mm × 4 mm × 3 mm
(suffix UA)
Approximate footprint
Description
The A1150, A1152, A1153, A1155, A1156, A1157, and A1158
comprise a family of two-wire, unipolar, Hall-effect switches,
which are factory-trimmed to optimize magnetic switchpoint
accuracy.These devices are produced on theAllegro® advanced
BiCMOS wafer fabrication process, which implements
a patented high frequency, 4-phase, chopper-stabilization
technique. This technique achieves magnetic stability over
the full operating temperature range, and eliminates offsets
inherent in devices with a single Hall element that are exposed
to harsh application environments.
The A115x family has a number of automotive applications.
These include sensing seat track position, seat belt buckle
presence, hood/trunk latching, and shift selector position.
Two-wire unipolar switches are particularly advantageous in
cost-sensitive applications because they require one less wire
for operation versus the more traditional open-collector output
switches. 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.
Continued on the next page…
V+ VCC
0.01 μF
Functional Block Diagram
Regulator
To all subcircuits
Clock/Logic
Amp
Low-Pass
Filter
Schmitt
Trigger
Polarity
A1152-DS, Rev. 5
GND
UA package only
GND
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