Different voltage levels damaging USB-8451?

We just started using I2C communications in our product so I am not very familiar with it. We are using the USB-8451 to communicate with a HCS08 device. The SDA and SCL lines are pulled up to 3.3V on the unit under test with 5.11K. The NI USB-8451 appears to be damaged if the +5V and the +3.3V from the UUT are shorted. The +5V from the USB-8451 is not used. The manufacturing issues have been addressed. We want to keep the device from harm if this mistake happens again.
We are not seeing any reason the different voltage level should affect the 8451, but we have a dead device. Any ideas on how this is happening or how to mitigate this in the future?
Thanks,
Larry

Hi Larry,
There is information on how to wire the USB-8451 without damaging it on page 3-10 of this manual. Also take a look at the specifications section in Appendix A.
Best,
Jeff S.
National Instruments

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Thank you for the information. I have similar problem, i get the error message Error -301744 occurred at NI-845x I2C Run Script.vi:6110001,
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Generated a simple program to talk to i2c on NSE5310 using usb-8451. I get the following error.
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NI-8451 Testing ver2.vi ‏13 KB
NSE-5310_Datasheet_v1_0.pdf ‏1569 KB

You are providing the wrong address. As the error message says, you must provide the 7-bit address, excluding the read/write bit. . You are providing the full value of the first byte, including the read/write bit. In other words, you are doing the exact opposite of what the error message tells you to do. If you've set the user-bits to 0 then the correct address is 0x40.
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Message Edited by t06afre on 01-23-2009 03:41 PM
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</script>
<?php include_once("/var/home/hondovfd/hondovfd.org/www/analyticstracking.php"); ?>
</body>
</html>
Other Page:
<?php
if (!isset($_SESSION)) {
session_start();
$MM_authorizedUsers = "user,admin";
$MM_donotCheckaccess = "false";
// *** Restrict Access To Page: Grant or deny access to this page
function isAuthorized($strUsers, $strGroups, $UserName, $UserGroup) {
// For security, start by assuming the visitor is NOT authorized.
$isValid = False;
// When a visitor has logged into this site, the Session variable MM_Username set equal to their username.
// Therefore, we know that a user is NOT logged in if that Session variable is blank.
if (!empty($UserName)) {
    // Besides being logged in, you may restrict access to only certain users based on an ID established when they login.
    // Parse the strings into arrays.
    $arrUsers = Explode(",", $strUsers);
    $arrGroups = Explode(",", $strGroups);
    if (in_array($UserName, $arrUsers)) {
      $isValid = true;
    // Or, you may restrict access to only certain users based on their username.
    if (in_array($UserGroup, $arrGroups)) {
      $isValid = true;
    if (($strUsers == "") && false) {
      $isValid = true;
return $isValid;
$MM_restrictGoTo = "/membersonly/loginfailed.php";
if (!((isset($_SESSION['MM_Username'])) && (isAuthorized("",$MM_authorizedUsers, $_SESSION['MM_Username'], $_SESSION['MM_UserGroup'])))) {
$MM_qsChar = "?";
$MM_referrer = $_SERVER['PHP_SELF'];
if (strpos($MM_restrictGoTo, "?")) $MM_qsChar = "&";
if (isset($QUERY_STRING) && strlen($QUERY_STRING) > 0)
$MM_referrer .= "?" . $QUERY_STRING;
$MM_restrictGoTo = $MM_restrictGoTo. $MM_qsChar . "accesscheck=" . urlencode($MM_referrer);
header("Location: ". $MM_restrictGoTo);
exit;
?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />

<title>Members Only Area</title>

<meta name="description" content="Hondo Fire and Rescue serves the Arroyo Hondo and Canada Village areas of Santa Fe County, NM." />
<meta name="keywords" content="hondo, hondo fire, hondo vfd, hondo fire department, santa fe county fire department, santa fe county, volunteer fire department, hondo volunteer fire department" />
<link href="../stylesheet.css" type="text/css" rel="stylesheet" />

<script src="../SpryAssets/SpryMenuBar.js" type="text/javascript"></script>
<link href="../SpryAssets/SpryMenuBarVertical.css" rel="stylesheet" type="text/css" />
</head>
<body class="thrColLiqHdr">
<div id="container">
<div id="header"></div>
<div id="sidebar1">
<h3>Navigation : </h3>
<ul id="MenuBar1" class="MenuBarVertical">
<li><a href="/index.php">Home</a></li>
<li><a href="/support.php">Support Hondo</a></li>
<li><a class="MenuBarItemSubmenu" href="#">Information Menu</a>
    <ul>
      <li><a href="/people.php">Our People</a></li>
      <li><a href="http://www.google.com/maps/ms?ie=UTF8&hl=en&msa=0&msid=101620713606637979698.00045b6ead4ab4ea70b78&z=11" target="_blank">Response Area</a></li>
      <li><a href="/medical.php">Medical</a></li>
      <li><a href="/apparatus.php">Apparatus</a></li>
      <li><a href="/training.php">Training</a></li>
      <li><a href="/volunteer.php">Volunteer</a></li>
      <li><a href="/statistics.php">Statistics</a></li>
      <li><a href="/patchtrading.php">Patch Trading</a></li>
    </ul>
</li>
<li><a href="/album.php">Photo Gallery</a></li>
<li><a href="/calendar.php">Calendar</a></li>
<li><a href="/news.php">Blog/News</a></li>
<li><a href="/links.php">Links</a></li>
<li><a href="/contact.php">Contact Us</a></li>
</ul>
<br />
<form action="https://www.paypal.com/cgi-bin/webscr" method="post">
<span class="lefttext">
<input type="hidden" name="cmd" value="_s-xclick">
<input type="hidden" name="hosted_button_id" value="8567201">
<input type="image" src="https://www.paypal.com/en_US/i/btn/btn_donate_LG.gif" border="0" name="submit" alt="PayPal - The safer, easier way to pay online!" />
<img alt="" border="0" src="https://www.paypal.com/en_US/i/scr/pixel.gif" width="1" height="1">
</img></input></input>
</span>
</form>
<span class="lefttext"><br />
</span>
<center>
<span class="lefttext"><a href="http://www.facebook.com/pages/Santa-Fe-NM/Hondo-Volunteer-Fire-Department/74284233488" target="_blank" class="lefttext">Hondo VFD on Facebook</a></span>
</center>
</div>
<div id="sidebar2">
    <p><a href="/membersonly/login.php">Log In</a> | <a href="/membersonly/logout.php">Log Out</a></p>
    <p>Call Statistics for <?php
$myFile = "/var/home/hondovfd/hondovfd.org/www/membersonly/month.txt";
$fh = fopen($myFile, 'r');
$theData = fread($fh, filesize($myFile));
fclose($fh);
echo $theData;
?> as of <?php
$myFile = "/var/home/hondovfd/hondovfd.org/www/membersonly/date.txt";
$fh = fopen($myFile, 'r');
$theData = fread($fh, filesize($myFile));
fclose($fh);
echo $theData;
?></p>
<table width="90%" border="0" cellspacing="0" cellpadding="0">
<tr>
    <td width="60%">EMS Calls</td>
    <td width="40%"><?php
$myFile = "/var/home/hondovfd/hondovfd.org/www/membersonly/emscalls.txt";
$fh = fopen($myFile, 'r');
$theData = fread($fh, filesize($myFile));
fclose($fh);
echo $theData;
?></td>
</tr>
<tr>
    <td>Fire Calls</td>
    <td><?php
$myFile = "/var/home/hondovfd/hondovfd.org/www/membersonly/firecalls.txt";
$fh = fopen($myFile, 'r');
$theData = fread($fh, filesize($myFile));
fclose($fh);
echo $theData;
?></td>
</tr>
</table>
<hr />
    <div id="cse" style="width:100%;">Loading</div>
<script src="http://www.google.com/jsapi" type="text/javascript"></script>
<script type="text/javascript">
google.load('search', '1');
google.setOnLoadCallback(function(){
    new google.search.CustomSearchControl().draw('cse');
}, true);
</script>
     
</div>

<div id="mainContent">
<div class="top"></div><div class="wrap">
    <table width="100%" border="0" cellspacing="0" cellpadding="0">
<tr>
    <td height="47" class="h2">Members Only Area</td>
</tr>
<tr>
    <td><p><a href="/membersonly/documents.php">Useful Documents</a></p>
      <p><a href="/membersonly/IncidentCount01_08.pdf">Current Call Statistics</a> as of 9/3/09</p>
      </td>
</tr>
</table>
<script type="text/javascript">

</script>
</div>
<div class="bottom"></div>
</div>
      <br class="clearfloat" />
<div id="footer">
    <p align="center">© Copyright 2009 Hondo Volunteer Fire Department | <a href="mailto:[email protected]">Contact Us</a><a href="http://www.legalhelpers.com/chapter-13-bankruptcy/chapter13.html"></a><br />Hosting provided by <a href="http://studiox.com/" target="_blank">Studio X</a></p>
</div>
</div>
<script type="text/javascript">

</script>
<?php include_once("/var/home/hondovfd/hondovfd.org/www/analyticstracking.php"); ?>
</body>
</html>

you don't need all that bloat. set a session during login of some kind of uniquely identifying id. i.e.
$_SESSION['id'] = $row_rs['id'];
then on the pages you need to protect, check it like this....
<?php
session_start();
if (!(isset($_SESSION['id']) && $_SESSION['id'] != '')) {
die(header("Location: http://www.notinprotectedareas.com")); }
?>
you can use an include file i.e.
<?php require_once('login_check.php'); ?>
where file is name login_check.php to make your auth controls clean on your protected pages.

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