A1260 Datasheet, PDF (1/13 Pages) Allegro MicroSystems – Chopper-Stabilized Precision Vertical Hall-Effect Latch

A1260
Chopper-Stabilized Precision Vertical Hall-Effect Latch
FEATURES AND BENEFITS
• AEC-Q100 automotive qualified
• Magnetic sensing parallel to surface of the package
• Highly sensitive switch thresholds
• Symmetrical latch switch points
• Operation from unregulated supply down to 3 V
• Small package sizes
• Automotive grade
□□Output short-circuit protection
□□Resistant to physical stress
□□Reverse-battery protection
□□Solid-state reliability
□□Superior temperature stability
□□Supply voltage Zener clamp
PACKAGES:
3-Pin SOT23-W
(Suffix LH)
3-Pin SIP
(Suffix UA)
Not to scale
DESCRIPTION
The A1260 vertical Hall-effect sensor IC is an extremely
temperature-stable and stress-resistant magnetic-sensing
device ideal for harsh operating environments. The sensor
is actuated by alternating north and south polarity magnetic
fields in plane with the device’s branded face. Two package
options, the SOT23W surface-mount and SIP through-hole,
allow sensing in a variety of orientations with respect to the
mounting position. Superior high-temperature performance
is made possible through dynamic offset cancellation, which
reduces the residual offset voltage normally caused by device
overmolding, temperature dependencies, and thermal stress.
Each device includes on a single silicon chip a voltage regulator,
a Hall-voltage generator, a small-signal amplifier, chopper
stabilization, a Schmitt trigger, and a short-circuit protected
NMOS output to sink up to 25 mA. The on-board regulator
permits operation with supply voltages of 3 to 24 V. The
advantage of operating down to 3 V is that the device can be
used in 3.3 V applications, while allowing additional external
resistance in series with the supply pin for greater protection
against high-voltage transient events.
The output is turned on when a south pole of sufficient strength
perpendicular to the vertical Hall element is present. A north
pole is necessary to turn the output off. Package type LH is a
modified SOT23W surface-mount package that switches with
magnetic fields oriented perpendicularly to the non-leaded side
of the package. The UA package is an ultra-mini SIP, equipped
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VCC
Vertical
Hall
Hall
Amp
Regulator
To All Subcircuits
Sample, Hold,
& Averaging
Low-Pass
Filter
Control
Current
Limit
VOUT
A1260-DS, Rev. 2
GND
Functional Block Diagram