The device exceeds Airbus ABD0100 specification requirements by providing 800-volt galvanic isolation between individual sensors and the logic interface. Sensor input thresholds comply to Airbus ABD0100H and MIL-STD-704 specifications and sensor outputs may be read from a serial peripheral interface (SPI) or parallel bus.
A sensor output interrupt pin alerts the system to a change in sensor input, avoiding constant polling via SPI to check status.
Each discrete input is configurable as a GND/open or supply/open (28-volt/open) sensor, making this device suitable for systems that tolerate different grounds or excessive voltage transients.
The HI-8400 also is suitable for relay switching detection, providing a 1 milliamp wetting current to prevent dry contacts. In addition to galvanic isolation, 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) with respect to the sensor return ground without using external components.
The device is available in industrial -40 to 85-degree Celsius and extended -55 to 125-degree Celsius temperature ranges with optional burn-in at the higher temperature, and comes in a compact 44 pin PQFP package.
For more information contact Hold Integrated Circuits online at www.holtic.com.
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