A3144 Hall Effect Sensor

DESCRIPTION

• The A3144 is an integrated Hall effect non-latching sensor.
• Holding a magnet near the sensor will cause the output pin to toggle.
• This makes for a robust presence sensor. A reed sensor also works nicely, but can be limited by the glass encapsulation and size.
• A hall effect sensor is much smaller, but can handle less current than a reed switch.
• The device includes an on-chip Hall voltage generator for magnetic sensing, a comparator that amplifies the Hall voltage, and a Schmitt trigger to provide switching hysteresis for noise rejection, and open-collector output.
• An internal bandgap regulator is used to provide temperature compensated supply voltage for internal circuits and allows a wide operating supply range.
• If a magnetic flux density larger than threshold Bop, the output is turned on (low). The output state is held until a magnetic flux density reversal falls below Brp causing the output to be turned off (high)  

FEATURES

• Superior Temp. Stability for Automotive or Industrial Applications
• 4.5 V to 24 V operation, works with most unregulated supplies
• Open-Collector 25 mA output, compatible with digital logic
• Reverse Battery Protection
• Activate with Small, Commercially Available Permanent Magnets