MCZ33884

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 similar, except the Timer mode has the addition of an interrupt that is sent to the microprocessor if a switch is sensed closed, or upon the internal interrupt timer times out. An interrupt is ultimately sent to the microprocessor. All modes of operation are easily programmed via the Serial Peripheral Interface (SPI) control. Features 33884 SWITCH MONITOR INTERFACE DW SUFFIX EG (PB-FREE) SUFFIX 98ASB42344B 24-PIN SOICW Full Operation with 7.0 V < VPWR < 26 V, Limited Operation with ORDERING INFORMATION 5.5 V < VPWR < 7.0 V Temperature Input Voltage Range: -14 V to 40 V Device Package Range (TA) Interface Directly to Microprocessors Using SPI Protocol Wake Up on Change of Monitored Switch Status MC33884DW/R2 -40°C to 105°C 24 SOICW Programmable Wetting Current MCZ33884EG/R2 ...