The PST41 is an integrated Hall Effect latched sensor designed for electronic commutation of brush-less DC motor applications. The device includes an on-chip Hall voltage generator for magnetic sensing, a comparator that amplifiers the Hall voltage, and a Schmitt 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.

In the absence of a magnetic field, the output pin is “OFF” (High). A north pole of sufficient strength will turn the output “ON” (Low). While the magnetic flux density (B) is larger than threshold Bop, the output pin is “ON”. If B removed toward Brp, the output pin is latched “ON” state prior to B < Brp. When B < Brp, the output pin goes into “OFF” state.