www.
DataSheet4U.
com Freescale Semiconductor
Technical Data
Document Number: MC33884 Rev.
4.
0, 11/2006
Switch Monitor Interface
The 33884 Switch Monitor Interface is a monolithic silicon integrated circuit (IC) to perform switch monitoring functions.
The device provides efficient interface between electrical switches and low
voltage microprocessors.
The 33884 supplies switch contact pull-up and pull down current while monitoring the input
voltage level.
All inputs are protected for transients when implemented with an appropriate static discharge capacitor used on the inputs.
There are four modes of operation: Sleep, Normal, Polling, and Polling + INT Timer.
The Polling and Timer modes are ...