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 voltage * Low current consumption * Temperature compensation * Wide operating voltage range * Open-Collector pre-driver * 50mA maximum sinking output current * Reverse polarity protection * Lead Free Package: TO-92 **Documents:** * [Datasheet](http://www.sparkfun.com/datasheets/Components/General/Hall-US1881EUA.pdf) **Videos**
