www.recom-power.com

REV.: 0/2018

P-3

Reference Design

R-REF03-CAN1

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. The green LED on the board should light up

•

Inject test signal up to 5-Mbit into the TXD input pin (TXD/GND1) using a signal generator or other source

•

Check the CANH and CANL signals with a scope on the secondary side (CANH/GND2 and CANL/GND2)

•

Check the RXD signal with a scope on the primary side (RXD/GND1)

•

Turn off the signal generator

•

Turn off the 3.3V supply. The LED should turn off

Basic Test Setup

GND1

VCC1

TXD

CAN

(CANL)

(CANH)

Bus

SIGNAL

GENERATOR

RXD

GND1

GND2

SCOPE

SCOPE

Pin

Name

Description

Test Point

1

VCC1

Primary Supply 3.3V

TP1

2

GND1

Primary Ground

TP2

3

GND1

Primary Ground

4

TXD

CAN transmit data input

TP3

5

RXD

CAN receive data output

TP4

6

GND1

Primary Ground

TP5

Pin

Name

Description

Test Point

1

VCC2

Secondary Supply 5V

TP10

2

GND2

Secondary Ground

TP9

3

GND2

Secondary Ground

4

CANH

High-level CAN bus line

TP8

5

CANL

Low-level CAN bus line

TP7

6

GND2

Secondary Ground

TP6

Connector Description

Con1

Con2