HI-8470

16-Channel Discrete-to-Digital Sensor with ARINC 429 Transmitter

The HI-8470 is a sixteen-channel discrete-to-digital interface device. The IC has 16 channels which can sense Open/Ground or 28V/Open signal levels. The voltage threshold of the sensors is user-programmable with external resistors. Sense input thresholds may also be set to CMOS logic levels to interface the part with other sensors, for example, an external ADC.

An on-chip ARINC 429 transmitter/line driver allows the status of discrete lines to be transmitted in ARINC 429 format with pin-programmed label byte value, repetition rate and transmission speed. The complete operation of the HI-8470 is controlled by CMOS logic pins, negating the need for an MCU or software in the application.

The device uses an on-chip DC/DC converter to generate the required ARINC 429 line voltages from a 3.3V supply. In addition, the discrete sense pins and line driver outputs are lightning protected to RTCA/DO-160G, 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, resulting in additional component count and cost savings for the application. The user simply needs a single 3.3V power supply and a 1 MHz clock source, for ARINC 429 bit timing and word transmission rate scheduling.

The device is available in industrial −40oC to +85oC and extended −55oC to +125oC temperature ranges and comes in a 100-pin PQFP package.