Description
The A3340 Hall effect switch is an extremely temperature-stable
and stress-resistant sensor IC especially suited for operation
over extended temperature ranges up to 150°C. 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.
The device includes on a single silicon chip a voltage regulator,
Hall-voltage generator, small-signal amplifier, chopper
stabilization, Schmitt trigger, and a short-circuit protected
open-collector output to sink up to 25 mA. A south pole of
sufficient strength will turn the output off. An on-board regulator
permits operation with supply voltages of 4.2 to 24 volts.
Two package styles provide a magnetically optimized package
for most applications. Suffix LH is an SOT23W surface mount
package and while suffix UA is a three-lead ultramini SIP for
through hole mounting.
The A3340 complements the A3240, which offers the same
features, but with the opposite output polarity.
A3340-DS, Rev. 8
Features and Benefits
▪ Resistant to physical stress
▪ Superior temperature stability
▪ Output short-circuit protection
▪ Operation from unregulated supply
▪ Reverse battery protection
▪ Sol id-state reliability
▪ Small size
Chopper-Stabilized, Precision
Hall-Effect Switch
Packages: 3 pin SOT23W (suffix LH),
and 3 pin SIP (suffix UA)
Functional Block Diagram
Not to scale
A3340
Regulator
GND
VCC
VOUT
Control
Current Limit
<17
Dynamic Offset
Cancellation
Sample and Hold
To All Subcircuits
Amp
Amp
