R-REF03-CAN1 Recom Power

Complete isolated solution for CAN bus Features Contains galvanically-isolated CAN transceiver ISO1042 Contains R1SX-3.305/H - 3.3V to 5V 1W Reference Design DC-DC converter with 3kVDC isolation Reference Up to 5Mbit data rate in CAN FD mode Input and output test points Design R-REF03-CAN1 Meets ISO11898-2 (2016) standard Description 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 3.3V 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 (R2 and R4) with a common-mode capacitance and additional caps (C7, C8 and C9) on the CAN bus for protection. It also includes an option to populate a 120- resistor R3 which can be used with the EVM as a terminated line end (CAN is defined for 120 impedance twisted pair cable). Protection components like TVS diodes (D1) and common code (CM) choke (L1) are also provided with bypass paths if neces- sary. Using these options, the customer is allowed installation of the desired components. The output of the R1SX-3.305/H (U2) is used to supply the secondary (CAN bus) side of the digital isolator U1 and the green LED (LED1) which indicates the presence of the voltage on VCC2. VCC2 is loaded with a 120 resistor R7, too, to keep the VCC2 safely below 5.3V. Since the reference board internally consumes about 80mA from the output of the U2, a user can use about 120mA to supply circuits outside of this reference board through connector pin J2-1 or test point TP10. R-REF03-CAN1 Top view Caution: ESD sensitive. Always follow ESD preventative procedures when handling the product www.recom-power.com REV.: 0/2018 P-1R-REF03-CAN1 Reference Design Specifications (measured Ta= 25C, full load after warm up unless otherwise stated) BASIC CHARACTERISTICS of the R1SX-3.305/H Parameter Condition Min. Typ. Max. Input Voltage Range 10.0% 20kHz 60kHz 100kHz Internal Operating Frequency (1) Output Ripple and Noise 20MHz BW 100mVp-p Output Accuracy 5.0% tested for 1 second 3kVDC Isolation Voltage I/P to O/P with suffix /H rated for 1 minute 1.5kVAC Isolation Resistance 10G Isolation Capacitance 70pF Leakage Current 3A Operating Temperature Range -40C to +100C Operating Altitude 5000m Notes: Note1: Measurements are made with a 0.1F MLCC across output. (low ESR) Footprint Details of R1SX (mm) Pin Connection Pin Single 1 -Vin 8 5 2 +Vin Top View 4 -Vout 5 +Vout 1 2 4 8 NC NC= no connection Basic Specification of the ISO1042 The ISO1042 device is a galvanically-isolated controller area network (CAN) transceiver that meets the specifications of the ISO11898-2 (2016) standard. The device supports up to 5-Mbps data rate in CAN FD mode allowing much faster transfer of payload compared to classic CAN. This device uses a silicon dioxide (SiO2) insulation barrier with a withstand voltage of 5000 VRMS. Used in conjunction with isolated power supplies like R1SX from RECOM, the device prevents noise currents on a data bus or other circuits from entering the local ground and interfering with or damaging sensitive circuitry. ISO1042 accepts 1.8V, 2.5V, 3.3V or 5.5V supply voltage on the primary side (VCC1) and 5V on the secondary (VCC2). For more details about the ISO1042 please visit www.ti.com/product/iso1042 Notes: Note2: The reference board may contain pre-production version of the ISO1042. This pre-production version part number is XISO1042 and this part number is printed on the IC. If your board is populated with the XISO1042, the prototype device waiver from T exas Instruments (included at the end of this document) is applicable. www.recom-power.com REV.: 0/2018 P-2