A3144 A3144E OH3144E 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) (see datasheet bellow).

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
• Solid-State Reliability 
• Small Size
• Resistant to Physical Stress

Arduino Tutorials:

• Arduino Playground - Hall Effect
• Various Hall Effect Sensors (Bildr Tutorial)

Datasheet:

• A3144 Datasheet