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| 12 | <title>I²C, SMBus and hardware monitoring references</title> |
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| 14 | |
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| 15 | <body> |
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| 16 | |
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| 17 | <h1>I²C, SMBus and hardware monitoring references</h1> |
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| 18 | |
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| 19 | <p>This document contains all kinds of useful references to I²C and SMBus |
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| 20 | documents and implementations, and to hardware sensors documentation and |
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| 21 | implementations. Please report any other references you have found!</p> |
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| 22 | |
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| 23 | <ul> |
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| 24 | <li><span class="toplvl"><a name="i2c">I²C</a></span> |
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| 25 | <ul> |
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| 26 | <li><a href="http://www.ping.be/~ping0751/i2cfaq/i2cindex.htm">I²C FAQ</a></li> |
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| 27 | <li>Another <a href="http://vhimpe.crosswinds.net/electronics/i2cfaq/i2c.html">I²C |
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| 28 | FAQ</a></li> |
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| 29 | <li>Yet another <a href="http://www.esacademy.com/faq/i2c/">I²C FAQ</a></li> |
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| 30 | <li><a href="http://www.semiconductors.philips.com/buses/i2c/">Philips</a>, the I²C bus |
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| 31 | inventors |
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| 32 | <br />This site contains many example programs.</li> |
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| 33 | <li>Simon Vogl's <a href="http://voxel.at/prj/i2c/">I²C for Linux</a> page</li> |
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| 34 | </ul> |
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| 35 | </li> |
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| 36 | <li><span class="toplvl"><a name="smbus">SMBus</a></span> |
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| 37 | <ul> |
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| 38 | <li><a href="http://www.smbus.org/specs/">SMBus specification documents</a> |
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| 39 | <br />Includes version 1.1 and version 2.0 documents.</li> |
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| 40 | </ul> |
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| 41 | </li> |
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| 42 | <li><span class="toplvl"><a name="implementations">I²C and SMBus implementations</a></span> |
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| 43 | <ul> |
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| 44 | <li><a href="http://www.ali.com.tw/">ALi</a> (M1533, |
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| 45 | <a href="http://www.ali.com.tw/eng/product/corelogic/m1535.htm">M1535</a>, |
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| 46 | <a href="http://www.ali.com.tw/eng/product/corelogic/m1535d.htm">M1535D</a>, |
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| 47 | <a href="http://www.ali.com.tw/eng/product/corelogic/m1543c.htm">M1543C</a>) |
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| 48 | <br />ALi chipsets include SMBus adapters, integrated with many other functions. |
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| 49 | <br />Datasheets available on |
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| 50 | <a href="http://210.63.71.156/app/csd/webuser.nsf/DTSRF?OpenForm">request</a>.</li> |
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| 51 | <li><a href="http://developer.intel.com/">Intel</a> (PIIX4, |
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| 52 | <a href="http://developer.intel.com/design/chipsets/440mx/">82443MX</a>, |
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| 53 | i801, <a href="http://developer.intel.com/design/chipsets/810/">i810</a>, |
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| 54 | <a href="http://developer.intel.com/design/chipsets/810/810e.htm">i810E</a>, |
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| 55 | <a href="http://developer.intel.com/design/chipsets/815/">i815</a>) |
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| 56 | <br />Intel SMBus adapter, integrated with many other functions. |
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| 57 | <br />Datasheets available for |
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| 58 | <a href="http://developer.intel.com/design/chipsets/datashts/index.htm?iid=PCG+devleftnav">download</a>.</li> |
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| 59 | <li><a href="http://www.sis.com/">Silicon Integrated Systems</a> (SiS5595, |
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| 60 | <a href="http://www.sis.com/products/chipsets/integrated/socket370/630.htm">SiS630</a>, |
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| 61 | <a href="http://www.sis.com/products/chipsets/oa/pentium4/645.htm">SiS645</a>, |
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| 62 | <a href="http://www.sis.com/products/chipsets/southbridge/96x.htm#961">SiS961</a>) |
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| 63 | <br />No datasheet found.</li> |
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| 64 | <li><a href="http://www.via.com.tw/">VIA</a> (VT85C586B, VT82C596, VT82C596B, VT82C686A, |
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| 65 | VT82C686B, VT8231, VT8233, VT8233A) |
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| 66 | <br />VIA I²C adapters, integrated with many other functions (south bridge). |
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| 67 | Each south bridge may be used in many chipsets. To know which south bridge is used in |
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| 68 | your VIA chipset, use <a href="http://www.viaarena.com/?PageID=14">this table</a>. |
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| 69 | <br />Datasheets available on |
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| 70 | <a href="http://www.via.com.tw/en/datasheet/datasheets.jsp">request</a>.</li> |
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| 71 | </ul> |
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| 72 | </li> |
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| 73 | <li><span class="toplvl"><a name="chips">Hardware monitoring chips</a></span> |
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| 74 | <ul> |
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| 75 | <li><a href="http://www.analog.com/">Analog Devices</a> |
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| 76 | (<a href="http://www.analog.com/en/prod/0,2877,ADM1021A,00.html">ADM1021A</a>, |
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| 77 | <a href="http://www.analog.com/en/prod/0%2C2877%2CADM1022%2C00.html">ADM1022</a>, |
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| 78 | <a href="http://www.analog.com/en/prod/0%2C2877%2CADM1023%2C00.html">ADM1023</a>, |
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| 79 | <a href="http://www.analog.com/en/prod/0%2C2877%2CADM1024%2C00.html">ADM1024</a>, |
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| 80 | <a href="http://www.analog.com/en/prod/0,2877,ADM1025,00.html">ADM1025</a>, |
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| 81 | <a href="http://www.analog.com/en/prod/0,2877,ADM1025A,00.html">ADM1025A</a>, |
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| 82 | <a href="http://www.analog.com/en/prod/0%2C2877%2CADM1026%2C00.html">ADM1026</a>, |
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| 83 | <a href="http://www.analog.com/en/prod/0%2C2877%2CADM1027%2C00.html">ADM1027</a>, |
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| 84 | <a href="http://www.analog.com/en/prod/0%2C2877%2CADM1028%2C00.html">ADM1028</a>, |
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| 85 | <a href="http://www.analog.com/en/prod/0%2C2877%2CADM1029%2C00.html">ADM1029</a>, |
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| 86 | <a href="http://www.analog.com/en/prod/0%2C2877%2CADM1030%2C00.html">ADM1030</a>, |
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| 87 | <a href="http://www.analog.com/en/prod/0%2C2877%2CADM1031%2C00.html">ADM1031</a>, |
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| 88 | <a href="http://www.analog.com/en/prod/0%2C2877%2CADM1032%2C00.html">ADM1032</a>, |
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| 89 | <a href="http://www.analog.com/en/prod/0%2C2877%2CADM9240%2C00.html">ADM9240</a>) |
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| 90 | <br />Datasheets available for download.</li> |
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| 91 | <li><a href="http://www.genesyslogic.com/">Genesys Logic</a> (GL518, GL520, GL523) |
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| 92 | <br />No datasheet available.</li> |
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| 93 | <li><a href="http://www.hp.com/">Hewlett Packard</a> (Maxilife) |
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| 94 | <br />Datasheets only under NDA.</li> |
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| 95 | <li><a href="http://www.maxim-ic.com/">Maxim IC</a> (includes Dallas Semiconductor) |
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| 96 | (<a href="http://www.maxim-ic.com/quick_view2.cfm/qv_pk/2952">DS75</a>, |
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| 97 | <a href="http://www.maxim-ic.com/quick_view2.cfm/qv_pk/2737">DS1621</a>, DS1625, |
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| 98 | <a href="http://www.maxim-ic.com/quick_view2.cfm/qv_pk/2774">DS1775</a>, |
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| 99 | <a href="http://www.maxim-ic.com/quick_view2.cfm/qv_pk/2775">DS1780</a>, |
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| 100 | <a href="http://www.maxim-ic.com/quick_view2.cfm/qv_pk/1855">MAX1617</a>, |
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| 101 | <a href="http://www.maxim-ic.com/quick_view2.cfm/qv_pk/1964">MAX1617A</a>) |
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| 102 | <br />Datasheets available for |
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| 103 | <a href="http://www.maxim-ic.com/Sensors.cfm">download</a>.</li> |
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| 104 | <li><a href="http://www.myson.com.tw/">Myson</a> (MTP008) |
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| 105 | <br />No datasheet available.</li> |
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| 106 | <li><a href="http://www.national.com/">National Semiconductor</a> |
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| 107 | (<a href="http://www.national.com/pf/LM/LM75.html">LM75</a>, |
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| 108 | <a href="http://www.national.com/pf/LM/LM77.html">LM77</a>, |
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| 109 | <a href="http://www.national.com/pf/LM/LM78.html">LM78</a>, LM78J, |
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| 110 | <a href="http://www.national.com/pf/LM/LM79.html">LM79</a>, |
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| 111 | <a href="http://www.national.com/pf/LM/LM80.html">LM80</a>, |
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| 112 | <a href="http://www.national.com/pf/LM/LM84.html">LM84</a>, |
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| 113 | <a href="http://www.national.com/pf/LM/LM87.html">LM87</a>, |
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| 114 | <a href="http://www.national.com/pf/LM/LM92.html">LM92</a>) |
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| 115 | <br />Datasheets available for |
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| 116 | <a href="http://www.national.com/catalog/AnalogThermalManagement.html">download</a>.</li> |
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| 117 | <li><a href="http://www.sis.com/">Silicon Integrated Systems</a> (SIS5595, SIS950) |
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| 118 | <br />No datasheet available.</li> |
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| 119 | <li><a href="http://www.ti.com/">Texas Instruments</a> |
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| 120 | (<a href="http://focus.ti.com/docs/prod/productfolder.jhtml?genericPartNumber=THMC10">THMC10</a>, |
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| 121 | <a href="http://focus.ti.com/docs/prod/productfolder.jhtml?genericPartNumber=THMC50">THMC50</a>) |
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| 122 | <br />Datasheets available for download.</li> |
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| 123 | <li><a href="http://www.via.com.tw/">VIA</a> (VT82C686A, VT82C686B, VT8231, VT1211) |
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| 124 | <br />VIA bridges and chips which include integrated sensors. |
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| 125 | <br />Datasheets available on |
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| 126 | <a href="http://www.via.com.tw/en/datasheet/datasheets.jsp">request</a>.</li> |
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| 127 | <li><a href="http://www.winbond.com/">Winbond</a> (W83781D, W83782D, W83783S, |
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| 128 | W83791D, W83792D, W83L785TS-S, |
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| 129 | W83627HF, W83627THF, W83637HF, W83687THF, W83697HF) |
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| 130 | <br />Datasheets available for |
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| 131 | <a href="http://www.winbond.com/e-winbondhtm/partner/b_2_d_4.htm">hardware monitoring</a> and |
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| 132 | <a href="http://www.winbond.com/e-winbondhtm/partner/b_2_d_2.htm">super-I/O</a> |
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| 133 | chips.</li> |
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| 134 | </ul> |
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| 135 | </li> |
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| 136 | <li><span class="toplvl"><a name="protocol">Other protocol information</a></span> |
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| 137 | <ul> |
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| 138 | <li><a href="http://developer.intel.com/design/servers/ipmi/">IPMI documentation</a> |
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| 139 | <br />IPMI (intelligent platform management interface), a standard for hardware |
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| 140 | monitor chip reading.</li> |
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| 141 | </ul> |
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| 142 | </li> |
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| 143 | <li><span class="toplvl"><a name="installguides">Installation guides</a></span> |
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| 144 | <ul> |
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| 145 | <li><a href="http://khali.linux-fr.org/devel/i2c/">Jean Delvare's</a> |
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| 146 | <br />Focuses on the new i2c interface issues.</li> |
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| 147 | <li><a href="http://chrisp.orcon.net.nz/linux/sensors.html">Chris Peters'</a> |
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| 148 | <br />More simple, probably better for beginners.</li> |
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| 149 | </ul> |
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| 150 | </li> |
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| 151 | <li><span class="toplvl"><a name="sensorsconfdb">Motherboard configuration files</a></span> |
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| 152 | <p>Poject is rather incomplete, help is wanted to develop it further (or start a new one altogether)!</p> |
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| 153 | <ul> |
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| 154 | <li><a href="http://lm-sensors-db.berlios.de/">lm_sensors_db</a> |
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| 155 | <br />Hosted by berlios.de.</li> |
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| 156 | </ul> |
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| 157 | |
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| 158 | <p> |
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| 159 | As far we know only one motherboard manufacturer provides sensors.conf files:</p> |
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| 160 | <ul> |
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| 161 | <li><a href="http://www.tyan.com/archive/support/html/software_utilities.html#lms">TYAN motherboads sensors.conf |
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| 162 | files database (archive link)</a></li> |
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| 163 | <li><a href="ftp://ftp.tyan.com/software/lms/">TYAN motherboads sensors.conf |
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| 164 | files database (ftp link)</a> |
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| 165 | </li> |
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| 166 | </ul> |
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| 167 | |
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| 168 | <p>Personal collections:</p> |
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| 169 | <ul> |
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| 170 | <li><a href="http://www.lathspell.de/linux/lm_sensors/">Christian Hammers'</a></li> |
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| 171 | <li><a href="http://khali.linux-fr.org/devel/lm-sensors/">Jean Delvare's</a></li> |
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| 172 | </ul> |
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| 173 | </li> |
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| 174 | <li><span class="toplvl"><a name="applications">Hardware monitoring applications using the lm_sensors package</a></span> |
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| 175 | <ul> |
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| 176 | <li><a href="http://www.lm-sensors.org">LM Sensors</a> |
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| 177 | <br />First see the |
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| 178 | <a href="http://www.lm-sensors.org/browser/lm-sensors/trunk/prog">prog |
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| 179 | directory</a> in the lm_sensors package for sample applications. In particular, |
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| 180 | see <a href="http://stimpy.netroedge.com/tellerstats/">Tellerstats</a>, a web-based |
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| 181 | hardware monitor created by Phil Edelbrock, one of our main project contributors.</li> |
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| 182 | <li><a href="http://freshmeat.net/">Freshmeat</a> |
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| 183 | <br />A <a href="http://freshmeat.net/search/?q=lm_sensors">search for "lm_sensors"</a> |
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| 184 | brings up a good starter list.</li> |
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| 185 | <li><a href="http://sensors-applet.sourceforge.net/">GNOME Sensors Applet</a> |
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| 186 | <br />An applet for the GNOME panel to monitor lm_sensors outputs.</li> |
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| 187 | <li>ASFATM (Afterstep fan and temperature monitor) |
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| 188 | <br />A wharf/dock app that is capable of displaying system/CPU temperatures and up to |
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| 189 | three fan rotation speeds depending on the hardware being used. The development has |
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| 190 | stopped, but you still can download the sources from |
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| 191 | <a href="http://public.planetmirror.com/pub/afterstep/apps/asfatm/">Planet Mirror</a> |
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| 192 | or <a href="http://www-ftp.lip6.fr/pub/X11/afterstep/apps/asfatm/">LIP6</a>.</li> |
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| 193 | <li><a href="http://www.ma-scha.de/index.phtml?menu=progs&submenu=asftavm">ASFTAVM</a> |
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| 194 | (Afterstep fan, temperature and voltage monitor) |
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| 195 | <br />An enhancement of ASFATM.</li> |
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| 196 | <li><a href="http://www.warmcat.com/milksop/cheapi2c.html">CheapI2C</a> |
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| 197 | <br />A real-time linux I2C bus protocol capture tool using the parallel port.</li> |
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| 198 | <li><a href="http://www.plogic.com/dogsled/">Dogsled</a> |
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| 199 | <br />A tool to manage and monitor Linux clusters.</li> |
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| 200 | <li><a href="http://www.gkrellm.net/">GKrellM</a> |
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| 201 | <br />GKrellM is a single process stack of system monitors |
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| 202 | which supports applying themes to match its appearance to your |
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| 203 | window manager, Gtk, or any other theme. Very popular.</li> |
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| 204 | <li><a href="http://ksim.sourceforge.net/">KSim</a> |
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| 205 | <br />KSim is a GKrellM equivalent for KDE. Supports GKrellM skins.</li> |
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| 206 | <li><a href="http://gpdialapplet.sourceforge.net/">GPDial Applet</a> |
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| 207 | <br />A Gnome applet that displays a specific number from a file on the Gnome panel. |
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| 208 | By configuring it for a specific sensor file in /proc, you get a |
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| 209 | sensor reading. Requires fam and fam++.</li> |
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| 210 | <li><a href="http://digilander.libero.it/robang/gsensor/gsensor_en.html">GSensor</a> |
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| 211 | <br />GTK+ application.</li> |
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| 212 | <li><a href="http://lcd4linux.sourceforge.net/">LCD4Linux</a> |
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| 213 | <br />Displays kernel information on an external LCD.</li> |
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| 214 | <li><a href="http://phpsysinfo.sourceforge.net/">phpSysInfo</a> |
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| 215 | <br />Generates a web page with system information, optionally including sensors output. |
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| 216 | Recommended.</li> |
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| 217 | <li><a href="http://www.gedanken.demon.co.uk/procmeter3/">ProcMeter 3</a> |
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| 218 | <br />A comprehensive system monitoring package. Nice desktop application. |
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| 219 | Recommended.</li> |
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| 220 | <li><a href="http://www.joenst.de/s2w/">Sens2web</a> |
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| 221 | <br />A Perl script to generate a web page of sensor readings.</li> |
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| 222 | <li><a href="http://www.coverfire.com/sensor_sweep_applet/">Sensor Sweep Applet</a> |
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| 223 | <br />A configurable Gnome panel applet.</li> |
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| 224 | <li><a href="http://voyager2.htmlplanet.com/sensors_srvr.html">Sensors Server</a> |
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| 225 | <br />Nice client/server application with a html-embedded Java applet.</li> |
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| 226 | <li><a href="http://denis.corbin.free.fr/software.html">Sentinelle</a> |
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| 227 | <br />A daemon which warns you when your sensor readings reach critical values.</li> |
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| 228 | <li><a href="http://packages.debian.org/stable/x11/wmsensors.html">WMSensors</a> |
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| 229 | <br />A Windowmaker dockapp. By Adrian Baugh, maintained by the Debian team.</li> |
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| 230 | <li><a href="http://www.linuxgod.net/~jd/">WMSens Dockapp</a> |
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| 231 | <br />A Windowmaker dockapp that works only with the Winbond 83697HF chipset. |
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| 232 | By Jonathan D. Meadows.</li> |
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| 233 | <li><a href="http://www.fluxcode.net/">WMgtemp</a> |
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| 234 | <br />A Windowmaker dockapp that displays the CPU and system temperatures. |
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| 235 | By Roger Dunce.</li> |
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| 236 | <li><a href="http://www.gnodde.org/projects/wmtemp.php">WMtemp</a> |
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| 237 | <br />Another Windowmaker dockapp that displays the CPU and system temperatures. |
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| 238 | By Peter Gnodde. Inspired from WMgtemp.</li> |
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| 239 | <li><a href="http://member.melbpc.org.au/~iann/varyfan/">Varyfan</a> |
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| 240 | <br />A C program to vary the fan speeds for the CPU and case fans according to |
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| 241 | the temperature of the CPU and motherboard. By Ian Nicholls, more or less |
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| 242 | abandoned.</li> |
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| 243 | <li><a href="http://www.linuxhardware.org/xsensors/">xsensors</a> |
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| 244 | <br />A X11 version of sensors. Requires GTK+ 2.0. Nice, although many chips are not |
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| 245 | supported yet.</li> |
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| 246 | <li>Floyd Davidson has nice <a href="http://web.newsguy.com/floyd_davidson/sensors/">monitoring |
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| 247 | data graphics</a> generated using |
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| 248 | <a href="http://web.newsguy.com/floyd_davidson/code/sensors/">modified tellerstats |
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| 249 | scripts</a></li> |
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| 250 | <li><a href="http://freshmeat.net/projects/e-sensors/">E-Sensors</a> |
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| 251 | <br />An Enlightenment frontend (<i>epplet</i>) to lm_sensors, by Øystein Haare.</li> |
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| 252 | </ul> |
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| 253 | </li> |
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| 254 | <li><span class="toplvl"><a name="other">Other hardware monitoring implementations (not using LM Sensors)</a></span> |
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| 255 | <ul> |
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| 256 | <li><a href="http://mbm.livewiredev.com/">Motherboard Monitor</a> |
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| 257 | <br />A very comprehensive package for Windows, unfortunately discontinued. |
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| 258 | Supports many many devices. Also has a <a href="http://mbm.livewiredev.com/mobolist.html">great |
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| 259 | database of motherboards</a>. We wish to thank the author, Alex van Kaam, for the |
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| 260 | great cooperation we had.</li> |
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| 261 | <li><a href="http://www.lysator.liu.se/~alla/files/lm78_stuff/">Alexander Larsson's |
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| 262 | LM78 module</a> |
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| 263 | <br />The original module LM Sensors is based upon.</li> |
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| 264 | <li><a href="http://www.beowulf.org/software/">Beowulf project LM78 module</a> |
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| 265 | <br />By Erik Hendriks. Old, probably unmaintained.</li> |
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| 266 | <li><a href="http://smartmontools.sourceforge.net/">smartmontools</a> |
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| 267 | <br />The smartmontools package contains two utility programs |
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| 268 | (smartctl and smartd) to control and monitor storage systems |
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| 269 | using the Self-Monitoring, Analysis and Reporting Technology |
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| 270 | System (SMART) built into most modern ATA and SCSI hard |
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| 271 | disks. </li> |
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| 272 | <li><a href="http://www.guzu.net/linux/hddtemp.php">hddtemp</a> |
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| 273 | <br />Get the hard drive temperatures |
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| 274 | using the Self-Monitoring, Analysis and Reporting Technology |
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| 275 | System (SMART) built into most modern ATA and SCSI hard |
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| 276 | disks. Much simpler than smartmontools.</li> |
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| 277 | <li><a href="http://www.ganzfix.de/">TXWD</a> |
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| 278 | <br />Another LM78/LM75 module, by Chris Benndorf.</li> |
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| 279 | <li><a href="ftp://ftp.hypercore.co.jp/linux-sbs/kernel-patches/">Beta SMBus access |
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| 280 | through the BIOS interface</a> |
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| 281 | <br />Old, obviously abandoned.</li> |
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| 282 | </ul> |
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| 283 | </li> |
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| 284 | <li><span class="toplvl"><a name="tools">Other useful tools</a></span> |
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| 285 | <ul> |
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| 286 | <li><a href="http://users.ev1.net/~redelm/">CPUBurn</a> |
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| 287 | <br />CPU-heating program to stress-test marginally-cooled systems and test |
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| 288 | LM Sensors. Highly recommended.</li> |
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| 289 | <li><a href="http://people.ee.ethz.ch/~oetiker/webtools/rrdtool/">RRDTool (Round Robin |
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| 290 | Database)</a> |
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| 291 | <br />A database for readings taken over time, such as sensor data. |
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| 292 | The LM Sensors package contains scripts to create and update an RRD database |
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| 293 | and graphically display the data on webpages.</li> |
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| 294 | </ul> |
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| 295 | </li> |
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| 296 | <li><span class="toplvl"><a name="papers">White papers, documents, articles and other things</a></span> |
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| 297 | <ul> |
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| 298 | <li><a href="http://www.sbs-forum.org/marcom/winter01/Designing%20with%20SMBus%202.pdf"> |
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| 299 | Designing with SMBus 2.0</a><br /> |
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| 300 | A great introduction to SMBus 2.0 and the differences with version 1.x.</li> |
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| 301 | <li><a href="http://www.dmtf.org/standards/standard_alert.php">Alert standard format |
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| 302 | (ASF) specification</a> |
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| 303 | <br />A standard for system management messages using the SMBus |
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| 304 | and passing this information to remote management devices. By the DMTF.</li> |
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| 305 | <li><a href="http://www.tip.net.au/~millerp/rmch/recu-make-cons-harm.html">Recursive |
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| 306 | make considered harmful</a> |
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| 307 | <br />A paper on which the version 2 Makefile is based.</li> |
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| 308 | <li><a href="http://www.thermometrics.com/assets/images/ntcnotes.pdf">NTC thermistors</a> |
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| 309 | <br />A comprehensive description of the physics and mathematics of NTC thermistors.</li> |
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| 310 | <li><a href="http://www.jedec.org/DOWNLOAD/jedec/JEP106I.pdf">Standard manufacturer's |
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| 311 | identification code</a> |
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| 312 | <br />The official list of Manufacturer IDs for EEPROMs.</li> |
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| 313 | <li><a href="http://www.temperatures.com/">About temperature sensors</a> |
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| 314 | <br />A web guide to devices that measure temperature. General information.</li> |
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| 315 | <li><a href="http://www.analog.com/library/analogDialogue/archives/33-04/temperatures/index.html">Measuring |
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| 316 | temperatures on computer chips with speed and accuracy</a> |
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| 317 | <br />The advantages of thermal diodes over traditional thermistors.</li> |
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| 318 | <li><a href="http://www-900.ibm.com/developerWorks/cn/linux/hardware/stability/index_eng.shtml">Linux |
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| 319 | hardware stability guide</a> |
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| 320 | <br />A nice article about using LM Sensors for diagnosing hardware problems.</li> |
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| 321 | <li><a href="http://leenooks.com/163">Linux |
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| 322 | hardware monitoring INcompatibility guide</a> |
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| 323 | <br />A list of chips that don't work well under Linux.</li> |
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| 324 | <li><a href="http://www.analog.com/library/analogDialogue/archives/38-02/fan_speed.html">Why |
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| 325 | and how to control fan speed for cooling electronic equipment</a> |
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| 326 | <br />A comprehensive article by Mary Burke comparing fan speed |
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| 327 | control methods</li> |
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| 328 | </ul> |
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| 329 | </li> |
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| 330 | </ul> |
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| 331 | |
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| 332 | </body> |
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| 333 | |
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| 334 | </html> |
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