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