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+<table class="head">
+  <tr>
+    <td class="head-ltitle">HTU21(4)</td>
+    <td class="head-vol">Device Drivers Manual</td>
+    <td class="head-rtitle">HTU21(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">htu21</code> &#x2014; <span class="Nd">driver for
+    HTU21D and compatible temperature and humidity sensors</span></p>
+</section>
+<section class="Sh">
+<h1 class="Sh" id="SYNOPSIS"><a class="permalink" href="#SYNOPSIS">SYNOPSIS</a></h1>
+<p class="Pp">To compile this driver into the kernel, place the following lines
+    in your kernel configuration file:</p>
+<div class="Bd Pp Bd-indent"><code class="Cd">device htu21</code>
+<br/>
+<code class="Cd">device iicbus</code></div>
+<p class="Pp">Alternatively, to load the driver as a module at boot time, place
+    the following line in <a class="Xr">loader.conf(5)</a>:</p>
+<div class="Bd Pp Bd-indent Li">
+<pre>htu21_load=&quot;YES&quot;</pre>
+</div>
+</section>
+<section class="Sh">
+<h1 class="Sh" id="DESCRIPTION"><a class="permalink" href="#DESCRIPTION">DESCRIPTION</a></h1>
+<p class="Pp">The <code class="Nm">htu21</code> driver provides temperature and
+    relative humidity readings over I2C bus for the supported sensors:</p>
+<ul class="Bl-bullet Bl-compact">
+  <li>HTU21D</li>
+  <li>SHT21</li>
+  <li>Si7021</li>
+</ul>
+<p class="Pp">The <code class="Nm">htu21</code> driver reports data via
+    <a class="Xr">sysctl(8)</a> entries in the device's node in the
+    <a class="Xr">sysctl(8)</a> tree:</p>
+<dl class="Bl-tag">
+  <dt>temperature</dt>
+  <dd>The temperature, in hundredths of Kelvin.</dd>
+  <dt>humidity</dt>
+  <dd>The relative humidity, in hundredths of a percent.</dd>
+  <dt>crc_errors</dt>
+  <dd>The number of CRC errors in reading the measurements from the device.</dd>
+  <dt>power</dt>
+  <dd>The good power indication. This can be useful with battery powered
+      sensors.</dd>
+  <dt>heater</dt>
+  <dd>The built-in heater control. The heater can be used for testing and for
+      recovery from saturation after high humidity.</dd>
+  <dt>hold_bus</dt>
+  <dd>Whether the sensor should hold SCL low while performing the measurement.
+      Normally, the sensor releases the bus and NACKs all accessed until the
+      measurement is completed. The hold mode may be useful in mult-master
+      environments.</dd>
+</dl>
+<p class="Pp">On an <a class="Xr">FDT(4)</a> based system the following
+    properties must be set:</p>
+<dl class="Bl-tag">
+  <dt id="compatible"><var class="Va">compatible</var></dt>
+  <dd>Must be set to &quot;meas,htu21&quot;.</dd>
+  <dt id="reg"><var class="Va">reg</var></dt>
+  <dd>The I2C address of <code class="Nm">htu21</code>. Although, it is
+      hard-wired to 0x40 (7-bit) on all supported sensors.</dd>
+</dl>
+<p class="Pp">The DTS part for a <code class="Nm">htu21</code> device usually
+    looks like:</p>
+<div class="Bd Pp Li">
+<pre>/ {
+
+	...
+	htu21d {
+		compatible = &quot;meas,htu21&quot;;
+		reg = &lt;0x40&gt;;
+	};
+};</pre>
+</div>
+</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">fdt(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">htu21</code> driver and this manual page was
+    written by <span class="An">Andriy Gapon</span>
+    &lt;<a class="Mt" href="mailto:avg@FreeBSD.org">avg@FreeBSD.org</a>&gt;.</p>
+</section>
+<section class="Sh">
+<h1 class="Sh" id="BUGS"><a class="permalink" href="#BUGS">BUGS</a></h1>
+<p class="Pp">There is no way to control the measurement resolution.</p>
+<p class="Pp">Some sensor variants do not provide a serial number or use an
+    incompatible format. The <code class="Nm">htu21</code> driver does not
+    distinguish those variants and may complain about incorrect serial number
+    checksum.</p>
+</section>
+</div>
+<table class="foot">
+  <tr>
+    <td class="foot-date">January 19, 2021</td>
+    <td class="foot-os">FreeBSD 15.0</td>
+  </tr>
+</table>