The HI-35930 from Holt Integrated Circuits is a CMOS integrated circuit for interfacing a Serial Peripheral Interface (SPI) enabled microcontroller to the ARINC 429 serial bus. The device includes two receivers, each with user-programmable label recognition for any combination of 256 possible labels, 32 x 32 Receive FIFO, 3 priority-label quick-access double-buffered registers and analog line receiver. Both line receivers meet the lightning requirements of 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 no additional external components. The HI-35930 is a drop-in replacement for Holt’s popular HI-3593, enabling customers to add lightning protection to existing designs with a minimum of re-qualification or re-use existing software on new designs.

An independent transmitter has a 32 x 32 Transmit FIFO and built-in line driver. The line driver operates from a single 3.3V supply and includes on-chip DC/DC converter to generate the bipolar ARINC 429 differential voltage levels needed to directly drive the ARINC 429 bus. The status of the transmit and receive FIFOs and priority-label buffers can be monitored using the programmable external interrupt pins, or by polling the Status Registers. The Serial Peripheral Interface minimizes the number of host interface signals resulting in a small footprint device that can be interfaced to a wide range of industry-standard microcontrollers supporting SPI.

Other combinations of digital/analog receiver and transmitter are also offered (see datasheet for details). One device variant (HI-35933) includes a digital-only device, enabling galvanic isolation utilizing external Holt line receivers (HI-8460) and lightning protection on the transmitter using an external Holt lightning-protected line driver, HI-8597.

Features

• ARINC specification 429 compliant
• Single 3.3V power supply operation
• On-chip analog line driver and line receivers connect directly to the ARINC 429 Bus
• Integrated DO-160G lightning protection (Level 3) on both line receivers
• Programmable label recognition for 256 labels
• 32 x 32 Receive FIFO with Priority Label buffers for each Receive Channel
• 32 x 32 Transmit FIFO
• Independent data rates for Transmit and Receive channels
• 10MHz four-wire Serial Peripheral Interface
• Label bit-order control
• 32nd transmit bit can be data or parity
• Self test mode
• Low power
• Industrial and extended temperature ranges available

Applications

• Avionics data communication
• Serial to parallel conversion
• Parallel to serial conversion