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Isolated CAN-transceiver reference board eases protection challenges

By eeNews Europe

To ensure signal integrity and reliability, isolated CAN transceivers need isolated power as well as properly designed bus protection. The R-REF03-CAN1 satisfies these requirements as a ready-to-use reference board that solves the critical component-layout, signal-termination and routing challenges when bringing up a robust and reliable transceiver design. The board contains a TI ISO1042 isolated CAN transceiver, which supports data rates up to 5Mbps in CAN-FD mode and 1Mbps in CAN Classic. All the necessary protection components including TVS diodes and common-mode choke are provided, and the board gives users the flexibility to bypass these if desired. A 120Ω line-termination resistor can also be added for optimum CAN-bus performance with 120Ω-impedance twisted-pair cable. A Recom R1SX-3.305/H isolated surface-mount DC/DC converter provides the single 3.3V rail needed to power the ISO1042. Energy efficient and compact, measuring only 10.8×12.75×5.5mm, the converter is pre-configured with a “split” termination network. Common-mode capacitance and additional capacitors on the CAN bus are included for optimum protection. The converter output powers the CAN-bus side of the ISO1042 transceiver and lights a green LED power-good indicator. As the entire transceiver draws about 80mA, the R1SX-3.305/H can also power additional external loads up to about 120mA. The board provides a connector pin and a test point to facilitate this.

Dengrove Electronic Components – www.dengrove.com


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