The R-REF03-CAN1 Reference Board demonstrates the ISO1042 isolated CAN transceiver supplied by the R1SX-3.305/H isolated dc/dc converter. To supply the reference board only one 3.3-V external supply is required. The green LED indicates the presence of the VCC2 supply on the secondary (CAN bus) side. The reference board allows designers to quickly develop and analyze isolated systems.
The reference board is pre-configured with a “split” termination network with a common-mode capacitance and additional caps on the CAN bus for protection. It also includes an option to populate a 120-Ω resistor which can be used as a terminated line end (CAN is defined for 120-Ω impedance twisted pair cable). Protection components like TVS diodes and a common code choke are also provided with bypass paths if necessary.
The output of the R1SX-3.305/H is used to supply the secondary (CAN bus) side of the digital isolator and a green LED which indicates the presence of the voltage on VCC2. VCC2 is loaded with a 120-Ω resistor, too, to keep the VCC2 safely below 5.3 V. Since the reference board internally consumes about 80 mA, developers can use about 120 mA to supply circuits outside of this reference board through a connector pin or test point.
Recom Power, 6870 W 52nd Ave., Suite 125, Arvada, CO 80002, www.recom-power.com/pdf/Eval-Boards/R-REF03-CAN1.pdf