Hall-Effect Sensor - US1881 (Latching)

The US1881 is an integrated Hall effect latched sensor. That's nice but what does it do? 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 DO is turned on (low). The output state is held until a magnetic flux density reversal falls below Brp causing DO to be turned off (high). Features:3.5V to 24V DC operation voltageLow current consumptionTemperature compensationWide operating voltage rangeOpen-Collector pre-driver50mA maximum sinking output currentReverse polarity protectionLead Free Package: TO-92Documents:DatasheetBildr Tutorial