Industrologic UOB

Universal Opto-Isolator Board

Reference Manual

version 2/2/12



Industrologic, Inc.
3201 Highgate Lane
St. Charles, MO
63301
USA

Phone: (636) 723-4000
WWW: http://www.industrologic.com
Email: info@industrologic.com



Trademark and Copyright Information

UOB is a Trademark of Industrologic, Inc. 2007

This document is Copyright (c) 2007 by Industrologic, Inc.
All rights reserved.

No part of this manual may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying or scanning, for any purpose other than the personal use by the purchaser of this product. Industrologic, Inc. reserves the right to revise this document at any time without obligation to notify any person of such revision. Industrologic, Inc. assumes no responsibility for any errors that may appear in this document.


Warning/Disclaimer

Whereas effort has been made to make the information in this document as useful and accurate as possible, Industrologic, Inc. assumes no responsibility for the application, usefulness, or completeness, of the information contained herein. Under no circumstance will Industrologic, Inc. be responsible or liable for any damages or losses including indirect or consequential damages or losses arising from either the use of any information contained within this manual or the use of any products or services referenced within this manual.

Industrologic, Inc. reserves the right to change any product's features, specifications, documentation, warranties, fee schedules, and conditions at any time and without notice.

Industrologic products are provided as printed circuit board level assemblies. Some Industrologic products may include mechanical packaging accessories which are provide for the purchaser's convenience, and are not intended to be final assembly enclosures.

Industrologic products are provided with the understanding that the purchaser will determine fitness for any particular application as well as achieve compliance with any particular specifications or regulations as required or desired for that application.


Warranty

Industrologic, Inc. products are warranted to be free from defects in workmanship or material under normal use and service for a period of one year from date of purchase. Industrologic's warranty is to the original purchaser only, but is extended to you by the Distributor or OEM from whom you purchased the product.

Industrologic's obligation under this Warranty is limited to replacement with a new or repaired unit to the original purchaser. The unit must be returned, and replacements obtained from Industrologic, Inc. or the Distributor or OEM from whom it was purchased.

This warranty will not apply if, in the judgment of Industrologic, Inc., damage or failure of the product has resulted from accident, alteration, misuse, abuse, connection to or operation with incompatible signals or power sources, or improper installation.

Under no circumstances shall Industrologic, Inc. be liable to purchaser or any third party for any loss of profits or other direct or indirect costs, expenses, losses, or consequential damages arising out of or as a result of any defects in or failure of Industrologic products or any part or parts thereof.

THIS WARRANTY IS IN LIEU OF ANY OTHER WARRANTY, EITHER EXPRESSED OR IMPLIED, AS TO DESCRIPTION, QUALITY, MERCHANTABILITY, FITNESS FOR ANY PARTICULAR PURPOSE OR USE, OR ANY OTHER MATTER.


Return and Repair Policy

Products purchased in single piece quantities may be returned, if in resellable condition, for a full refund of the purchase price only, to the original purchaser, within 30 days of purchase.

Products must be returned by original purchaser with a Return Materials Authorization (RMA) number issued by Industrologic, Inc. or the Distributor or OEM from whom it was purchased, authorizing its return. Current repair or replacement fees and procedures will be related during the issue of the RMA number.

Warranty or repair units must be returned with postage and insurance paid by purchaser. Industrologic, Inc. is not responsible for damages or loss during shipment.




Industrologic UOB

Universal Opto-Isolator Board

The Industrologic UOB is an opto-isolator board assembly designed to allow microcontroller and other logic circuits to be interfaced to both input and output signals that require opto-isolation.



picture of UOB



Summary of Features



Mechanical specifications

Single-sided .062" FR-4 glass epoxy printed circuit board
Single circuit is only 2.0 inches by 1.0 inches
Three #6 clearance mounting holes on each individual board

mechanical drawing of UOB



Electrical specifications

Operating Environment:
Temperature: 0-50 degrees Celsius (32-122 Fahrenheit)
Humidity: 30 to 80 percent, non-condensing

The following values are provided as a quick reference only, and are specific to the optocoupler installed. Refer to the data sheet for the optocoupler installed for detailed information about the electrical characteristics of the optocoupler and additional information about connecting the optocoupler to various input and output circuits.        Fairchild 6N138-139 data sheet        Fairchild 4N29-33 data sheet 


                             Split-darlington   Darlington optocoupler
                             optocoupler

Power Supply Requirements:   6N139              4N33
+V supply maximum voltage:   18V                N/A
Maximum supply current:      1.5mA              N/A

Optocoupler input:           6N139              4N33
Minimum voltage:             1.75V              1.5V
Maximum current:             20mA               80mA
Minimum suggested current:   0.5mA              2mA

Optocoupler output:          6N139              4N33
Maximum voltage:             18V                30V
Maximum current:             20mA               150mA


Using the UOB

The UOB originates as a 4 board assembly that can be separated into individual boards by snapping the boards apart along a pre-cut score line. Each individual board then contains identical components and functions.

The UOB circuit is designed to allow an 8 pin DIP split-darlington optocoupler to be installed into an 8 pin socket. However, a 6 pin darlington optocoupler may be installed in this sockets using pin positions 2 though 7 of the 8 pin device.

The optocoupler circuit may be used as an input or output isolation circuit, with a power supply being required when using a split-darlington optocoupler.

The input to the optocoupler can be treated in a similar manner as an LED. A circuit driving the input can source current to the anode (or positive input) while the cathode is connected to ground, or the cathode (or negative input) can sink current while the anode is connected to a positive voltage.

The output to the optocoupler can be treated in a similar manner as an NPN transistor. The emitter can source current with the collector connected to a positive voltage, or the collector can sink current with the emitter connected to ground.

The manner in which the inputs and outputs are connected will determine whether or not the optocoupler circuit will invert the logic level of the signal being isolated.



Darlington versus Split-Darlington Optocoupler

The standard UOB board comes with a 6N139 or equivalent high gain split-darlington optocoupler installed. This device requires a positive voltage to supply current to the detector LED portion of the optocoupler. Typically this is done by supplying it with the positive logic supply voltage from the circuit that it is driving. If the UOB will be used to isolate a signal used to activate the digital input of other Industrologic products, the +V connection of the UOB will be connected to one of the +5 volt connections available on the Industrologic product. If the UOB will be used to isolate a digital input signal on other products, the user must supply this voltage, not to exceed 18 volts.

The UOB can be special ordered with a 4N33 or equivalent medium gain darlington optocoupler installed.



Changing the opto input current and opto output pullup resistance

Resistor R1 is used to select the opto input current. The following table lists the current and wattage that results from a particular resistor value and input voltage. The standard UOB comes with a 4.7K resistor for R1, which allows its input voltage to be in the range of 5 to 24 volts.

This table assumes a switched voltage only, and does not take into consideration the output circuitry, voltage drops, and current limitations that exist in logic gates and other output devices. Refer to the data sheet for the optocoupler installed for detailed information for additional information about connecting the optocoupler to logic gates and various input and output circuits.

Since the resistors on the UOB are rated at 1/4 watt, voltage and resistor combinations that exceed 1/4 watt are not listed. For increased reliability the value of the resistor selected should result in the lowest practical current/power setting. It can be seen from the chart that the higher input voltages will require the use of a high gain split-darlington optocoupler in order to keep the power dissipation of the resistor within its limits of 1/4 watt. 

                              Input Voltage

           48V             24V             12V              5V
RP1

100K       0.48mA .023W
 47K       1.02mA .049W    0.51mA .012W
 22K       2.1mA  .1W      1.1mA  .026W    0.54mA .0065W
 10K       4.8mA  .23W     2.4mA  .057W    1.2mA  .014W     0.5mA .0025W
4.7K                       5.1mA  .12W     2.5mA  .03W      1.0mA .0053W
2.2K                       10.9mA .26W     5.4mA  .065W     2.2mA .011W
  1K                                       12mA   .14W      5.0mA .025W
 470                                                        10.6mA/.053W



Resistor R2 is used to select the opto output pullup resistance, and can be removed if no pullup resistor is needed on the output, for example, if the output is driving something other than a digital input. The standard UOB comes with a 10K resistor for R2.



Schematic Diagram

schematic diagram of UOB




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