The HI-8428 is an 8-channel discrete-to-digital sensor fabricated with Silicon-on-Insulator (SOI) technology designed to interface with a Serial Peripheral Interface (SPI).

 

Each input is individually configurable as either GND/Open or Supply/Open (28V/Open). Discrete input thresholds and hysteresis are compliant with Airbus ABD0100H specification. In GND/Open mode, thresholds are set at 4.5V/10.5V, and in Supply/Open mode at 6V/12V.

 

The part operates from a 3.3V (+/- 5%) digital supply and 12V - 16.5V analog supply.

 

A 1mA wetting current is sourced from each SENSE input when GND/Open mode is selected for that pin. The wetting current serves to prevent dry relay or switch contacts.

 

All sense inputs are internally lightning protected to RTCA/DO160G, Section 22 Level 3 Pin Injection Test Waveform Set A (3 & 4), Set B (3 & 5A) and Set Z (3 & 5B) without the use of any external components.

 

The device is available in industrial −40^oC to +85^oC and extended −55^oC to +125^oC temperature ranges and comes in a 16-pin, narrow body SOIC with exposed heat pad.

 

HI-8428 is a drop-in replacement for the DEI1282.

 

 

Features

• Eight discrete inputs, individually configurable as GND/Open or Supply/Open (28V/Open)
• Sense inputs lightning protected to RTCA/DO1060G, Section 22 Level 3 Pin Injection Test Waveforms with no external components
• 10MHz Serial Peripheral Interface (SPI) allows daisychaining of parts for efficient board routing
• Withstands inadvertent application of 115V AC/400 Hz power to Sense inputs.
• Airbus ABD0100H compliant
• MIL-STD-704 compliant
• Internal Self-Test mode checks analog comparators and logic
• Robust CMOS Silicon-on-Insulator (SOI) technology
• Industrial & extended temperature ranges available
• Drop-in replacement for DEI1282

 

Applications

• Avionics discrete sensing applications