Olimex USB-ISO User guide

USB-ISO - USB 2.0 compliant, 1000VDC
USB Full Speed isolator

Users Manual

All boards produced by Olimex are ROHS compliant

Rev. D, July 2011

Copyright(c) 2011, OLIMEX Ltd, All rights reserved

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INTRODUCTION

USB-ISO is USB Full speed USB 2.0 compliant port isolator with 1000V isolation
voltage. This device is very useful as protects your PC computer USB host from
over-voltages, ESD shock. USB-ISO provides 1000VDC isolation and this way you
can connect to your PC programmers and debuggers which work directly with
targets at high voltages like 220V mains power supply etc. Even if your target is not
connected to high voltage, USB-ISO is additional protection for your valuable
computer, laptop etc. USB-ISO may work with or without external power supply, if
no external power supply it generates with isolated DC-DC converter 5V isolated
voltage for your USB device by taking power from your USB host, if your USB
deveice needs more power than your USB host can provide, there is external power
supply option you can connect any power supply adapter which provides power
supply from +8 to +15VDC and USB-ISO internal DC-DC will convert it to 5VDC
for the USB device. Note that in this case the external power supply should be
ISOLATED as this DC-DC converter is not isolated and the external power supply
will be directly connected to your USB programmer/debugger etc! Just your PC
side will be isolated.

USB-ISO FEATURES

– USB isolation 1000VDC between USB host and USB device

– Fully USB 2.0 Compliant

– Full speed data rate: 1.5 Mbps and 12 Mbps

– Bidirectional communication

– Short-circuit protection for xD+ and xD− lines

– Class 3A contact ESD performance per ANSI/ESD STM5.1-2007

– High common-mode transient immunity: >25 kV/μs

– USB_DEVICE connector- which is USB-B type and have to be connected to the

PC USB host.

– USB_HOST connector which is USB-A type and have to be connected to the

USB device like USB JTAG, programmer, debugger etc

– Power Jack for external power supply with +8-15VDC, note this power jack is

not isolated from the USB_HOST connector

– A DC-DC converter supplies isolated voltage to the USB_DEVICE from either

the external power supply, or (if no external power supply is connected) from
the USB_HOST device

– dimensions 41.5x36.5 mm (1.634x1.437")

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ELECTROSTATIC WARNING

The USB-ISO board is shipped in protective anti-static packaging. The board must
not be subject to high electrostatic potentials. General practice for working with
static sensitive devices should be applied when working with this board.

BOARD USE REQUIREMENTS

Cables: You need two 1.8 meter USB A-B cable to connect to the PC and to your

USB isolated device. Note these cables should be with LOW resistance (under 1
ohm) and good insulation, on the market there are cheap cables with HIGH
resistance (above 1 ohm) and poor insulation which are not good for USB
connection and cause signal fading and lost of communication packets.

SAFETY AND REGULATORY APPROVALS:

The USB isolator component used in USB-ISO have the following regulatory approvals:

– UL recognition: 5000 V rms for 1 minute per

– UL 1577 (pending)

– CSA Component Acceptance Notice #5A

– IEC 60601-1: 125 V rms (reinforced)

– IEC 60950-1: 380 V rms (reinforced)

– VDE certificate of conformity (pending)

– DIN V VDE V 0884-10 (VDE V 0884-10):2006-12

– VIORM = 846 V peak

POWER SUPPLY CIRCUIT

USB-ISO can take power from two sources:

– External Power Jack +8-15 V DC

– +5V from USB_HOST, in this case maximum current available depend on the

maximum current which PC USB host can provide and may be in 100-500mA
range

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