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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.

Features

? Full Operation with 7.0 V < VPWR < 26 V, Limited Operation with 5.5 V < VPWR < 7.0 V

? Input Voltage Range: -14 V to 40 V

? Interface Directly to Microprocessors Using SPI Protocol

? Wake Up on Change of Monitored Switch Status

? Programmable Wetting Current

? Four Switch-to-Ground Switches

? Six (Fixed Function) Inputs Monitoring Six Switch-to-Ground Switches

? Two (Fixed Function) Inputs Monitoring Two Switch-to-Battery Switches

? Quiescent Current in Sleep Mode < 10 μA

? Reset Input Defaults the Device to Sleep Mode

? Pb-Free Packaging Designated by Suffix Code EG