HI-8436

July 2016 HI-8436 32-Channel Ground/Open or Supply/Open Low Threshold Sensor with SPI Interface GENERAL DESCRIPTION The HI-8436 is a 32-channel discrete-to-digital sensor fabricated with Silicon-on-Insulator (SOI) technology designed to interface with a Serial Peripheral Interface (SPI). Four banks of 8 sense inputs can be programmed as either GND/Open or Supply/Open sensors. Supply/Open sensing is also referred to as 28V/Open sensing. All sense inputs are internally lightning protected to DO160G, Section 22, Cat AZ, BZ and ZZ without external components. The sensing circuit window comparator thresholds are set by programming the center threshold and hysteresis registers to values from 0.4V to 5.2V. The digital values of the sensed inputs can be read either one bank at a time or all 4 banks with one command. Each bank of sensors have a VWETn pin available for application of a voltage to supply pull up current to the GND/Open sensor. Interface to the digital subsystem is simple CMOS l...