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LM75的说明书文档,主要介绍温度传感器的使用
LM75A_ds.rar
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<html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta charset="utf-8"> <meta name="generator" content="pdf2htmlEX"> <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1"> <link rel="stylesheet" href="https://static.pudn.com/base/css/base.min.css"> <link rel="stylesheet" href="https://static.pudn.com/base/css/fancy.min.css"> <link rel="stylesheet" href="https://static.pudn.com/prod/directory_preview_static/625ec38f8cbeb85d572638d5/raw.css"> <script src="https://static.pudn.com/base/js/compatibility.min.js"></script> <script src="https://static.pudn.com/base/js/pdf2htmlEX.min.js"></script> <script> try{ pdf2htmlEX.defaultViewer = new pdf2htmlEX.Viewer({}); }catch(e){} </script> <title></title> </head> <body> <div id="sidebar" style="display: none"> <div id="outline"> </div> </div> <div id="pf1" class="pf w0 h0" data-page-no="1"><div class="pc pc1 w0 h0"><img class="bi x0 y0 w1 h1" alt="" src="https://static.pudn.com/prod/directory_preview_static/625ec38f8cbeb85d572638d5/bg1.jpg"><div class="t m0 x1 h2 y1 ff1 fs0 fc0 sc0 ls0 ws0">1.<span class="_ _0"> </span>General description</div><div class="t m0 x2 h3 y2 ff2 fs1 fc1 sc0 ls0 ws0">The LM75A is a temperature-to-digital con<span class="_ _1"></span>verter using an on-chip band<span class="_"> </span>gap temperature</div><div class="t m0 x2 h3 y3 ff2 fs1 fc1 sc0 ls0 ws0">sensor and Sigma-delta A-to-D conv<span class="_ _1"></span>ersion technique<span class="_ _1"></span>. The de<span class="_ _1"></span>vice is also a thermal</div><div class="t m0 x2 h3 y4 ff2 fs1 fc1 sc0 ls0 ws0">detector<span class="_ _2"> </span>providing<span class="_ _2"> </span>an<span class="_ _2"> </span>o<span class="_ _1"></span>v<span class="_ _1"></span>er<span class="_ _3"></span>temperature<span class="_ _2"> </span>detection<span class="_ _2"> </span>output.<span class="_ _2"> </span>The<span class="_ _2"> </span>LM75A<span class="_ _2"> </span>contains<span class="_ _2"> </span>a<span class="_ _2"> </span>number<span class="_ _2"> </span>of</div><div class="t m0 x2 h3 y5 ff2 fs1 fc1 sc0 ls0 ws0">data registers: Con&#64257;guration register (Conf) to store the de<span class="_ _1"></span>vice settings such as de<span class="_ _1"></span>vice</div><div class="t m0 x2 h3 y6 ff2 fs1 fc1 sc0 ls0 ws0">operation mode<span class="_ _1"></span>, OS operation mode, OS polarity and OS f<span class="_ _1"></span>ault queue as described in</div><div class="t m0 x2 h3 y7 ff2 fs1 fc2 sc0 ls0 ws0">Section 7 &#8220;Functional description&#8221;<span class="fc1">; temperature register (T<span class="_ _4"></span>emp) to store the digital temp</span></div><div class="t m0 x2 h3 y8 ff2 fs1 fc1 sc0 ls0 ws0">reading, and set-point registers (T<span class="_ _4"></span>os and Th<span class="_ _1"></span>yst) to store programmab<span class="_ _1"></span>le o<span class="_ _1"></span>v<span class="_ _1"></span>er<span class="_ _3"></span>temperature</div><div class="t m0 x2 h3 y9 ff2 fs1 fc1 sc0 ls0 ws0">shutdown and h<span class="_ _1"></span>ysteresis limits<span class="_ _1"></span>, that can be communicated b<span class="_ _1"></span>y a controller via the 2-wire</div><div class="t m0 x2 h3 ya ff2 fs1 fc1 sc0 ls0 ws0">serial I</div><div class="t m0 x3 h4 yb ff2 fs2 fc1 sc0 ls0 ws0">2</div><div class="t m0 x4 h3 ya ff2 fs1 fc1 sc0 ls0 ws0">C-bus interf<span class="_ _1"></span>ace<span class="_ _1"></span>. The de<span class="_ _1"></span>vice also includes an open-drain output (OS) which</div><div class="t m0 x2 h3 yc ff2 fs1 fc1 sc0 ls0 ws0">becomes activ<span class="_ _1"></span>e when the temperature e<span class="_ _1"></span>xceeds the progr<span class="_ _1"></span>ammed limits. There are three</div><div class="t m0 x2 h3 yd ff2 fs1 fc1 sc0 ls0 ws0">selectable logic address pins so that eight de<span class="_ _1"></span>vices can be connected on the same b<span class="_ _1"></span>us</div><div class="t m0 x2 h3 ye ff2 fs1 fc1 sc0 ls0 ws0">without address con&#64258;ict.</div><div class="t m0 x2 h3 yf ff2 fs1 fc1 sc0 ls0 ws0">The LM75A can be con&#64257;gured f<span class="_ _1"></span>or diff<span class="_ _1"></span>erent operation conditions<span class="_ _1"></span>. It can be set in nor<span class="_ _3"></span>mal</div><div class="t m0 x2 h3 y10 ff2 fs1 fc1 sc0 ls0 ws0">mode to periodically monitor the ambient temperature, or in shutdown mode to minimiz<span class="_ _1"></span>e</div><div class="t m0 x2 h3 y11 ff2 fs1 fc1 sc0 ls0 ws0">power consumption. The OS output oper<span class="_ _1"></span>ates in either of two selectab<span class="_ _1"></span>le modes:</div><div class="t m0 x2 h3 y12 ff2 fs1 fc1 sc0 ls0 ws0">OS<span class="_"> </span>comparator mode or OS interrupt mode. Its activ<span class="_ _1"></span>e state can be selected as either</div><div class="t m0 x2 h3 y13 ff2 fs1 fc1 sc0 ls0 ws0">HIGH or LO<span class="_ _1"></span>W<span class="_ _5"></span>. The f<span class="_ _1"></span>ault queue that de&#64257;nes the number of consecutiv<span class="_ _1"></span>e f<span class="_ _1"></span>aults in order to</div><div class="t m0 x2 h3 y14 ff2 fs1 fc1 sc0 ls0 ws0">activate the OS output is prog<span class="_ _1"></span>rammab<span class="_ _1"></span>le as well as the set-point limits<span class="_ _1"></span>.</div><div class="t m0 x2 h3 y15 ff2 fs1 fc1 sc0 ls0 ws0">The temperature register alwa<span class="_ _6"></span>ys stores an 11-bit 2's complement data giving a</div><div class="t m0 x2 h5 y16 ff2 fs1 fc1 sc0 ls0 ws0">temperature<span class="_"> </span>resolution<span class="_"> </span>of<span class="_"> </span>0.125<span class="_"> </span><span class="ff3">&#176;</span>C<span class="_ _6"></span>.<span class="_"> </span>This<span class="_"> </span>high<span class="_"> </span>temperature<span class="_"> </span>resolution<span class="_"> </span>is<span class="_"> </span>particular<span class="_ _3"></span>ly<span class="_"> </span>useful</div><div class="t m0 x2 h3 y17 ff2 fs1 fc1 sc0 ls0 ws0">in applications of measuring precisely the ther<span class="_ _3"></span>mal drift or r<span class="_ _3"></span>una<span class="_ _6"></span>way<span class="_ _4"></span>.</div><div class="t m0 x2 h3 y18 ff2 fs1 fc1 sc0 ls0 ws0">The de<span class="_ _6"></span>vice is powered-up in normal operation mode with the OS in comparator mode,</div><div class="t m0 x2 h5 y19 ff2 fs1 fc1 sc0 ls0 ws0">temperature threshold of 80<span class="_"> </span><span class="ff3">&#176;</span>C and h<span class="_ _6"></span>ysteresis of 75<span class="_"> </span><span class="ff3">&#176;</span>C, so that it can be used as a</div><div class="t m0 x2 h3 y1a ff2 fs1 fc1 sc0 ls0 ws0">stand-alone ther<span class="_ _3"></span>mostat with those pre-de&#64257;ned temper<span class="_ _1"></span>ature set points.</div><div class="t m0 x1 h2 y1b ff1 fs0 fc0 sc0 ls0 ws0">2.<span class="_ _0"> </span>Features</div><div class="t m0 x2 h3 y1c ff4 fs1 fc0 sc0 ls0 ws0">n<span class="_ _7"> </span><span class="ff2 fc1">Pin-f<span class="_ _1"></span>or-pin replacement f<span class="_ _6"></span>or industr<span class="_ _3"></span>y standard LM75 and offers impro<span class="_ _6"></span>ved temperature</span></div><div class="t m0 x5 h5 y1d ff2 fs1 fc1 sc0 ls0 ws0">resolution of 0.125<span class="_"> </span><span class="ff3">&#176;</span>C and speci&#64257;cation of a single par<span class="_ _3"></span>t ov<span class="_ _6"></span>er power supply range from</div><div class="t m0 x5 h3 y1e ff2 fs1 fc1 sc0 ls0 ws0">2.8<span class="_"> </span>V to 5.5<span class="_"> </span>V</div><div class="t m0 x2 h3 y1f ff4 fs1 fc0 sc0 ls0 ws0">n<span class="_ _7"> </span><span class="ff2 fc1">Small 8-pin package types: SO8 and TSSOP8</span></div><div class="t m0 x2 h3 y20 ff4 fs1 fc0 sc0 ls0 ws0">n<span class="_ _7"> </span><span class="ff2 fc1">I</span></div><div class="t m0 x6 h4 y21 ff2 fs2 fc1 sc0 ls0 ws0">2</div><div class="t m0 x7 h3 y20 ff2 fs1 fc1 sc0 ls0 ws0">C-bus interf<span class="_ _6"></span>ace with up to 8 de<span class="_ _1"></span>vices on the same bus</div><div class="t m0 x2 h3 y22 ff4 fs1 fc0 sc0 ls0 ws0">n<span class="_ _7"> </span><span class="ff2 fc1">P<span class="_ _6"></span>ower supply r<span class="_ _6"></span>ange from 2.8<span class="_"> </span>V to 5.5<span class="_"> </span>V</span></div><div class="t m0 x2 h5 y23 ff4 fs1 fc0 sc0 ls0 ws0">n<span class="_ _7"> </span><span class="ff2 fc1">T<span class="_ _4"></span>emperatures range from<span class="_"> </span><span class="ff3">&#8722;</span>55<span class="_"> </span><span class="ff3">&#176;</span>C to +125<span class="_"> </span><span class="ff3">&#176;<span class="_ _1"></span><span class="ff2">C</span></span></span></div><div class="t m0 x2 h5 y24 ff4 fs1 fc0 sc0 ls0 ws0">n<span class="_ _7"> </span><span class="ff2 fc1">11-bit ADC that off<span class="_ _1"></span>ers a temperature resolution of 0.125<span class="_"> </span><span class="ff3">&#176;</span>C</span></div><div class="t m0 x8 h6 y25 ff1 fs3 fc0 sc0 ls0 ws0">LM75A</div><div class="t m0 x8 h7 y26 ff1 fs4 fc0 sc0 ls0 ws0">Digital temperature sensor and thermal watchdog</div><div class="t m0 x8 h8 y27 ff1 fs5 fc0 sc0 ls0 ws0">Rev<span class="_ _4"></span>. 04 &#8212; 10 Jul<span class="_ _1"></span>y 2007<span class="_ _8"> </span>Product data sheet</div><a class="l" rel='nofollow' onclick='return false;'><div class="d m1"></div></a></div><div class="pi" data-data='{"ctm":[1.611639,0.000000,0.000000,1.611639,0.000000,0.000000]}'></div></div> </body> </html>
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