Description
The A3250 and A3251 are field-programmable, chopper-
stabilized, unipolar Hall-effect switches designed for use in
high-temperature applications. These devices use a chop-
per-stabilization technique to eliminate offset inherent in
single-element devices.
The A3250 and A3251 are externally programmable
devices. The devices have a wide range of programmabil-
ity of the magnetic operate point (B
OP
) while the hysteresis
remains fixed. This advanced feature allows for optimiza-
tion of the device switchpoint and can drastically reduce
the effects of variations found in a production environment,
such as magnet and device placement tolerances.
These devices provide on-chip transient protection. A Zener
clamp on the power supply protects against overvoltage
conditions on the supply line. These devices also include
short-circuit protection on the output.
The output of the A3250 switches LOW when subjected
to a south-polarity magnetic field with a flux density that
exceeds the threshold for B
OP
, and switches HIGH when the
field drops below the magnetic release point, B
RP
. The out-
put of the A3251 has the opposite polarity, switching HIGH
in a south-polarity magnetic field that B
OP
, and switching
LOW when the field drops below B
RP
.
3250-DS Rev. 11
Features and Benefits
?Chopper stabilization for stable switchpoints throughout
operating temperature range
?Externally programmable operate point (through VCC pin)
?On-board voltage regulator for 4.2 V to 24 V operation
?On-chip protection against:
?Supply transients
?Output short-circuits
?Reverse-battery condition
Field-Programmable, Chopper-Stabilized
Unipolar Hall-Effect Switches
Continued on the next page&
Package: 3-pin SOT89 (suffix LT) and
3-pin SIP (suffix UA)
Functional Block Diagram
Not to scale
A3250 and A3251
Current Limit
Amp
Regulator
Program/Lock
Low-Pass
Filter
VCC
GND
Programming
Logic
Offset Adjust
VOUT
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