3235

Reliable and Rugged Magnetic Sensing Switch
Two Outputs Independently Switched by North and South Poles
Independent Actuation of Outputs Minimizes Inductive-Load Reactive Transient
Built-in Hysteresis Minimizes Interference from Stray Fields

Operates from 4.5 V to 24 V
Outputs Compatible with All Logic Levels
On-Board Reverse Polarity Protection
Open-Collector, Active-Low Outputs

Figure 1 illustrates a method of sensing the presence of either a north or south magnetic pole.  Because the UGN3235K is an open-collector device, it is possible to directly connect (wired OR) the two outputs.  This causes the output to go LOW when either a north pole or south pole of sufficient magnitude is sensed.  The device connected in this manner suits many applications, ranging from doubling the resolution of a ring-magnet encoder, to zero-crossing detection.