The repeater uses a combination of Holt's HI-8476 ARINC 429 receiver and HI-8470 ARINC 429 transmitter, and operates autonomously without an MCU or software, company officials say. Holt's two-chip repeater eliminates the microcontroller, software, and associated certification costs, and any additional ARINC 429 protocol devices.
The HI-8476 receiver has ARINC 429 label filtering, enabling reception of three individual labels or groups of labels. The received ARINC 429 bus data is made available at 32 digital output pins.
The HI-8470 transmitter uses this 32-bit parallel data input to transmit an ARINC 429 compliant word automatically on the bus. Optional parity checking is possible and configuration and operation of the transmitter is controlled by CMOS logic pins.
The repeater operates from one 3.3-volt power supply and may be 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) by using two external resistors on the receiver inputs.
These devices are available in industrial and extended-temperature operating ranges. The industrial version operates in temperatures from -40 to 85 degrees Celsius, and the extended-temperature version operates in temperatures from -55 to 125 C.
For more information contact Holt Integrated Circuits online at www.holtic.com.