Datasheet

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REV.: 0/2018 P-1

R-REF03-CAN1

Reference Design

Features

Reference

Design

• Complete isolated solution for CAN bus

• Contains galvanically-isolated CAN transceiver ISO1042

• Contains R1SX-3.305/H - 3.3V to 5V 1W

DC-DC converter with 3kVDC isolation

• Up to 5Mbit data rate in CAN FD mode

• Input and output test points

• 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-Ω resistor R3 which can be used with the EVM as a

terminated line end (CAN is deﬁned for 120Ω 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 120Ω 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.

Caution:

ESD sensitive. Always follow ESD preventative procedures when

handling the product!

R-REF03-CAN1 Top view

Summary of content (6 pages)

PAGE 1
Features Reference Design • Complete isolated solution for CAN bus • Contains galvanically-isolated CAN transceiver ISO1042 • Contains R1SX-3.305/H - 3.3V to 5V 1W DC-DC converter with 3kVDC isolation • Up to 5Mbit data rate in CAN FD mode • Input and output test points • Meets ISO11898-2 (2016) standard Reference Design R-REF03-CAN1 Description The R-REF03-CAN1 Reference Board demonstrates the ISO1042 isolated CAN transceiver supplied by the R1SX-3.305/H isolated DC/DC converter.
PAGE 2
R-REF03-CAN1 Reference Design Specifications (measured @ Ta= 25°C, full load after warm up unless otherwise stated) BASIC CHARACTERISTICS of the R1SX-3.305/H Parameter Condition Min. Input Voltage Range Max. ±10.0% 20kHz Internal Operating Frequency Output Ripple and Noise Typ. (1) 60kHz 100kHz 20MHz BW 100mVp-p Output Accuracy ±5.0% Isolation Voltage I/P to O/P with suffix “/H” Isolation Resistance 3kVDC 1.
PAGE 3
R-REF03-CAN1 Reference Design Specifications (measured @ Ta= 25°C, full load after warm up unless otherwise stated) Typical Switching Waveforms Input and output waveforms of the reference board for a 5Mbit signal CH1 - TXD CH2 - CANL CH3 - RXD CH4 - CANH Quick Start Guide • Apply 3.3V to VCC1/GND1 and observe 5V on the VCC2/GND2.
PAGE 4
J1 1 2 3 4 5 6 VCC1 C12 4U 7 25V C1 4U7 25V REV.: 0/2018 GND1 GND1 TP1 TP2 TP3 TP4 C13 4U7 25V GND1 TP5 C2 1uF GND1 VCC1 GND1 RXD NC NC NC GND1 GND1 5 4 6 7 2 8 ISO1042DWR TXD VCC1 3 1 U1 C3 0.1uF GND1 VCC1 -V OUT +V OUT VCC2 VCC2 GND2 GND2 GND2 NC CANL 15 10 9 14 12 13 16 11 GND2 VCC2 R1SX-3.3 05/H-R -VIN NC +VIN U2 CANH 1 8 2 4 5 GND2 2 0 0 R5 51uH 2 00mA 1 L1 R1 GND 2 R6 120R 3 4 LED1 0603 GND2 R7 120R VCC2 R3 120 R4 59.0 R2 59.
PAGE 5
R-REF03-CAN1 Reference Design Specifications (measured @ Ta= 25°C, full load after warm up unless otherwise stated) DIMENSION AND PHYSICAL CHARACTERISTICS Parameter Type Value Dimension (LxWxH) 81.28 x 44.96 x 18.0mm Weight 18.0g typ. Layout Top Layer Layer 2 (GND) Bottom (GND) Layer 3 (GND) Notes: Note3: Visit www.recom-power.com/eval-ref-boards to download the Gerber files BOM Comp.
PAGE 6
R-REF03-CAN1 Reference Design Specifications (measured @ Ta= 25°C, full load after warm up unless otherwise stated) BOM Comp. Description Manufacturer Part Number Manufacturer Qty. C8, C9 CAP, CERM, 68 pF, 100 V, +/- 5%, C0G/NP0, 0603 Vishay 2 C2, C5 CAP, CERM, 1 uF, 50 V, +/- 10%, X7R, 0603 TDK 2 C3, C6 CAP, CERM, 0.1 uF, 25 V, +/- 5%, X7R, 0603 AVX 2 C1, C10, C11, C12, C13 Cap Cer 1206 50V 4.