GENERAL DESCRIPTION
The HI-8437 is a 32-channel high impedance discrete-to-digital sensor fabricated with Silicon-on-Insulator (SOI) technology designed to interface with a Serial Peripheral Interface (SPI).
The four banks of 8 sense inputs can be programmed to detect one of two threshold ranges, VTHR1, VTHR2.
All sense inputs have a 400KΩ resistor to ground and are internally lightning protected to DO160G, Section 22, Cat AZ, BZ and ZZ without external components.
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FEATURES
• Robust CMOS Silicon-on-Insulator (SOI) technology
• 32-channel Programmable Sense Operation, two
   programmable threshold ranges, 4 X 8 Input Sensors
• Programmable HI/LO Threshold and Hysteresis in
   0.1V steps, from 0.4V to 5.2V.
• Single Low Voltage Supply Operation
• Logic Operation from 3.0V to 3.6V
• 20 MHz Serial Peripheral Interface (SPI)
• Lightning Protected Sense Inputs
• Internal Self-Test

APPLICATION
• Low thresholds applications.
• Avionics Discrete to Digital Sensing