Holt Integrated Circuits announced the introduction of HI-8475, a novel ARINC 429 receiver designed specifically for use without a microprocessor. All configuration and control is programmed using logic input pins, eliminating the need for a microprocessor or software interface and the related costs for software certification. The device compliments Holt’s previously released ARINC 429 transmitter, HI-8470, which receives discrete sensor data and autonomously transmits on an ARINC 429 bus without MCU intervention.

The HI-8475 receives ARINC 429 data directly from the bus and makes the data available at 32 digital output pins. ARINC 429 label filtering is defined by 16 digital input pins, defining a maskable label match to enable reception of a single label or group of labels.

The device supports both high-speed and low-speed ARINC 429 data rates, operating from a 1MHz clock source and a single 3.3V or 5.0V power supply. The receiver inputs 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) using only two external resistors.

“Software development and certification is a significant time and money expense for our customers,” said Anthony Murray, Director of Business Development at Holt. “These latest ARINC 429 receivers and transmitters often eliminate the MCU from customer boards entirely, providing smaller, lower cost solutions entirely free from software approvals.”

For more complex situations, the 128-pin HI-8476 option adds two more maskable ARINC 429 labels, and provides both true and complementary digital outputs to simplify external logic. In addition, a default post-reset condition on the outputs is programmable before the first ARINC 429 word is received.

These devices are available in industrial −40oC to +85oC and extended −55oC to +125oC temperature ranges. An Application Development Kit is available from Holt on request.