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-<table class="head">
- <tr>
- <td class="head-ltitle">LM75(4)</td>
- <td class="head-vol">Device Drivers Manual</td>
- <td class="head-rtitle">LM75(4)</td>
- </tr>
-</table>
-<div class="manual-text">
-<section class="Sh">
-<h1 class="Sh" id="NAME"><a class="permalink" href="#NAME">NAME</a></h1>
-<p class="Pp"><code class="Nm">lm75</code> &#x2014; <span class="Nd">lm75 i2c
- digital temperature sensor driver</span></p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="SYNOPSIS"><a class="permalink" href="#SYNOPSIS">SYNOPSIS</a></h1>
-<p class="Pp"><code class="Cd">device iic</code>
- <br/>
- <code class="Cd">device iicbus</code>
- <br/>
- <code class="Cd">device lm75</code></p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="DESCRIPTION"><a class="permalink" href="#DESCRIPTION">DESCRIPTION</a></h1>
-<p class="Pp">The <code class="Nm">lm75</code> driver provides access to sensor
- data and configuration over the <a class="Xr">iicbus(4)</a>.</p>
-<p class="Pp">It provides an easy and simple way to check the functionality of
- an i2c bus as it provides read and write access to the
- <code class="Nm">lm75</code> configuration register.</p>
-<p class="Pp">The access to <code class="Nm">lm75</code> data is made via the
- <a class="Xr">sysctl(8)</a> interface:</p>
-<div class="Bd Pp Li">
-<pre>dev.lm75.0.%desc: LM75 temperature sensor
-dev.lm75.0.%driver: lm75
-dev.lm75.0.%location: addr=0x49
-dev.lm75.0.%pnpinfo: name=lm750 compat=national,lm75
-dev.lm75.0.%parent: iicbus3
-dev.lm75.0.temperature: 27.1C
-dev.lm75.0.thyst: 75.0C
-dev.lm75.0.tos: 80.0C
-dev.lm75.0.faults: 1
-dev.lm75.0.mode: comparator
-dev.lm75.0.polarity: active-low
-dev.lm75.0.shutdown: 0</pre>
-</div>
-<dl class="Bl-tag">
- <dt id="dev.lm75._d.temperature"><var class="Va">dev.lm75.%d.temperature</var></dt>
- <dd>Is the read-only value of the current temperature read by the sensor.</dd>
- <dt id="dev.lm75._d.thyst"><var class="Va">dev.lm75.%d.thyst</var></dt>
- <dd>Sets the hysteresis temperature. Once the temperature gets over the
- overtemperature shutdown value (tos) it needs to drop below the hysteresis
- temperature to disable the output (interrupt) pin again.</dd>
- <dt id="dev.lm75._d.tos"><var class="Va">dev.lm75.%d.tos</var></dt>
- <dd>Sets the overtemperature shutdown value. Once the temperature gets over
- this value the output pin will be enabled. The way the output (interrupt)
- pin works, depends on the mode configuration.</dd>
- <dt id="dev.lm75._d.faults"><var class="Va">dev.lm75.%d.faults</var></dt>
- <dd>Is the number of faults that must occur consecutively to activate the
- interrupt (output) pin. It can be set to 1, 2, 4, and 6.</dd>
- <dt id="dev.lm75._d.mode"><var class="Va">dev.lm75.%d.mode</var></dt>
- <dd>Sets the operation mode for the sensor interrupt pin. It can be set to
- 'comparator' (default) or 'interrupt'.</dd>
- <dt id="dev.lm75._d.polarity"><var class="Va">dev.lm75.%d.polarity</var></dt>
- <dd>Sets the polarity of the sensor interrupt pin. It can be set to
- 'active-low' (default) or 'active-high'. Please note that the output pin
- is an open-drain output and it needs a proper pull-up resistor to
- work.</dd>
- <dt id="dev.lm75._d.shutdown"><var class="Va">dev.lm75.%d.shutdown</var></dt>
- <dd>When set to '1' it shuts down the sensor. The temperature conversion stops
- but the sensor remains with its i2c bus active, i.e., it can be woken up
- by setting this option to '0' again.</dd>
-</dl>
-<p class="Pp">Please check the <code class="Nm">lm75</code> datasheet for more
- details.</p>
-<p class="Pp">When used together with <a class="Xr">snmp_lm75(3)</a> it allows
- the monitoring of <code class="Nm">lm75</code> temperature data over
- SNMP.</p>
-<p class="Pp">The <code class="Nm">lm75</code> driver supports both the low and
- the high resolution models.</p>
-<p class="Pp">The low resolution model (lm75) provides a 9 bit output with the
- LSB representing 0.5C.</p>
-<p class="Pp">The high resolution model (lm75a) provides an 11 bit output with
- the LSB representing 0.125C.</p>
-<p class="Pp">The driver tries to auto-detect the <code class="Nm">lm75</code>
- model, but the detection of some <code class="Nm">lm75</code> clones may not
- work reliably.</p>
-<p class="Pp">On a <a class="Xr">device.hints(5)</a> based system, such as
- <code class="Li">MIPS</code>, these values are configurable for
- <code class="Nm">lm75</code>:</p>
-<dl class="Bl-tag">
- <dt id="hint.lm75._d.at"><var class="Va">hint.lm75.%d.at</var></dt>
- <dd>Is the <a class="Xr">iicbus(4)</a> you are attaching to.</dd>
- <dt id="hint.lm75._d.addr"><var class="Va">hint.lm75.%d.addr</var></dt>
- <dd>Is the <code class="Nm">lm75</code> i2c address on the
- <a class="Xr">iicbus(4)</a>.</dd>
-</dl>
-<p class="Pp">On a <a class="Xr">FDT(4)</a> based system, such as
- <code class="Li">ARM</code>, the DTS part for a <code class="Nm">lm75</code>
- device usually looks like:</p>
-<div class="Bd Pp Li">
-<pre>i2c {
- /* Properties describing the controller appear here. */
- ...
- lm750@49 {
- compatible = &quot;national,lm75&quot;;
- reg = &lt;0x49&gt;;
- };
-};</pre>
-</div>
-<p class="Pp">Where:</p>
-<dl class="Bl-tag">
- <dt id="compatible"><var class="Va">compatible</var></dt>
- <dd>Should always be set to &quot;national,lm75&quot;.</dd>
- <dt id="reg"><var class="Va">reg</var></dt>
- <dd>Indicates which 7-bit i2c address the <code class="Nm">lm75</code> is
- wired at. <code class="Nm">lm75</code> temperature sensors can be wired to
- 8 different addresses, allowing up to 8 sensors on the same
- <a class="Xr">iicbus(4)</a>.</dd>
-</dl>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="SEE_ALSO"><a class="permalink" href="#SEE_ALSO">SEE
- ALSO</a></h1>
-<p class="Pp"><a class="Xr">snmp_lm75(3)</a>, <a class="Xr">fdt(4)</a>,
- <a class="Xr">iic(4)</a>, <a class="Xr">iicbus(4)</a>,
- <a class="Xr">sysctl(8)</a></p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="HISTORY"><a class="permalink" href="#HISTORY">HISTORY</a></h1>
-<p class="Pp">The <code class="Nm">lm75</code> driver first appeared in
- <span class="Ux">FreeBSD 11.0</span>.</p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="AUTHORS"><a class="permalink" href="#AUTHORS">AUTHORS</a></h1>
-<p class="Pp">The <code class="Nm">lm75</code> driver and this manual page were
- written by <span class="An">Luiz Otavio O Souza</span>
- &lt;<a class="Mt" href="mailto:loos@FreeBSD.org">loos@FreeBSD.org</a>&gt;.</p>
-</section>
-</div>
-<table class="foot">
- <tr>
- <td class="foot-date">December 26, 2017</td>
- <td class="foot-os">FreeBSD 15.0</td>
- </tr>
-</table>