A1190LUA-T Datasheet, PDF (1/18 Pages) Allegro MicroSystems – Programmable, Chopper-Stabilized, Two Wire Hall-Effect Switches

A1190, A1192, and A1193
Programmable, 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
▪ Field programmable for optimized switchpoints
▪ Industry leading ISO 7637-2 performance through use of
proprietary, 40-V clamping structure
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 A1190, A1192, and A1193 comprise a family of two-
wire, unipolar, Hall-effect switches, which can be trimmed
by the user at end-of-line to optimize magnetic switchpoint
accuracy in the application. These devices are produced on
the Allegro^™ 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 A119x 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.
All family members are offered in two package styles. The LH
is a SOT-23W style, miniature, low profile package for surface-
mount applications. The UA is a 3-pin, ultra-mini, single inline
package (SIP) for through-hole mounting. Both packages are
lead (Pb) free, with 100% matte tin leadframe plating.
V+ VCC
0.01 μF
Functional Block Diagram
Regulator
Program / Lock
To all subcircuits
Clock/Logic
Offset Adjust
I_CC Adjust
Amp
Low-Pass Schmitt
Filter
Trigger
Polarity
A1190-DS, Rev. 3
GND
UA package only
GND