2. Construction

<p>The following diagram, taken from page 6 of the <a href="/file/0J170/MLX90614.pdf">MLX90614ESF datasheet</a> (749k pdf), shows the MLX90614ESF pinout as seen when looking at the top of the sensor.</p> <table class="picture_with_caption center"><tr><td><img alt="" class="" data-gallery-pictures="[{&quot;id&quot;:&quot;0J1267&quot;,&quot;caption&quot;:&quot;\u003cp\u003eMLX90614ESF pinout as viewed from the top of the sensor.\u003c/p\u003e&quot;,&quot;url_tiny&quot;:&quot;https://a.pololu-files.com/picture/0J1267.98x98.jpg?5082ec80ea8f9704cc9c9fc31623ba36&quot;,&quot;url_medium&quot;:&quot;https://a.pololu-files.com/picture/0J1267.600x480.jpg?5082ec80ea8f9704cc9c9fc31623ba36&quot;,&quot;url_full&quot;:&quot;https://a.pololu-files.com/picture/0J1267.1200.png?5082ec80ea8f9704cc9c9fc31623ba36&quot;,&quot;longest_side&quot;:224}]" data-picture-id="0J1267" data-picture-longest_side="224" src="https://a.pololu-files.com/picture/0J1267.224.png?5082ec80ea8f9704cc9c9fc31623ba36" /></td><p></tr></table></p> <ul> <li><strong>VSS:</strong> Ground. The metal can is also connected to this pin.</li> <li><strong>SCL / Vz:</strong> Serial clock input for 2 wire communications protocol. 5.7V zener is available at this pin for connection of external bipolar transistor to MLX90614A to supply the device from external 8 -16V source.</li> <li><strong>SDA / PWM:</strong> Digital input / output. In PWM mode, the measured object temperature is available at this pin Pulse Width Modulated. In SMBus-compatible mode, this pin is automatically configured as open drain NMOS. The sensor ships in SMBus-compatible mode.</li> <li><strong>VDD:</strong> External supply voltage (4.5 &#8211; 5.5&nbsp;V).</li> </ul> <p>Connect the sensor to the Orangutan as shown below to enable SMBus communication. If you are using an Orangutan based on the ATmega328, ATmega168, or ATmega48, connect its <strong>PC4</strong> pin to <strong>SDA</strong> (sensor pin 2) and <strong>PC5</strong> pin to <strong>SCL</strong> (sensor pin 1); if you are using the Orangutan X2, which is based on the ATmega644, connect its PC1 pin to SDA and PC0 pin to SCL. <strong>VSS</strong> (sensor pin 4) connects to the Orangutan&#8217;s ground rail, and <strong>VDD</strong> (sensor pin 3) connects to the Orangutan&#8217;s regulated 5V power bus. It is recommended that you solder a 0.1&nbsp;uF capacitor between power (VDD) and ground (VSS).</p> <table class="center"> <tr> <td><table class="picture_with_caption center"><tr><td style="max-width: 300px"><a href="https://a.pololu-files.com/picture/0J1236.1200.png?c1ff0ae9aea5b436a602c8d30ae54698" class="noscript-fallback"><img alt="" class="zoomable" data-gallery-pictures="[{&quot;id&quot;:&quot;0J1236&quot;,&quot;caption&quot;:&quot;\u003cp\u003eMLX90614 connection to SMBus.\u003c/p\u003e&quot;,&quot;url_tiny&quot;:&quot;https://a.pololu-files.com/picture/0J1236.98x98.jpg?c1ff0ae9aea5b436a602c8d30ae54698&quot;,&quot;url_medium&quot;:&quot;https://a.pololu-files.com/picture/0J1236.600x480.jpg?c1ff0ae9aea5b436a602c8d30ae54698&quot;,&quot;url_full&quot;:&quot;https://a.pololu-files.com/picture/0J1236.1200.png?c1ff0ae9aea5b436a602c8d30ae54698&quot;,&quot;longest_side&quot;:280}]" data-picture-id="0J1236" data-picture-longest_side="280" src="https://a.pololu-files.com/picture/0J1236.300.png?c1ff0ae9aea5b436a602c8d30ae54698" /></a></td></tr><tr><th style="max-width: 300px"><p>MLX90614 connection to SMBus.</p></th></tr></table></td> <td> <table class="picture_with_caption center"><tr><td style="max-width: 300px"><img alt="" class="" data-gallery-pictures="[{&quot;id&quot;:&quot;0J1237&quot;,&quot;caption&quot;:&quot;\u003cp\u003eMLX90614 temperature sensor connected to an Orangutan SV-168.\u003c/p\u003e&quot;,&quot;url_tiny&quot;:&quot;https://a.pololu-files.com/picture/0J1237.98x98.jpg?ebaed704919f924a6ae0dc6f1ef4c686&quot;,&quot;url_medium&quot;:&quot;https://a.pololu-files.com/picture/0J1237.600x480.jpg?ebaed704919f924a6ae0dc6f1ef4c686&quot;,&quot;url_full&quot;:&quot;https://a.pololu-files.com/picture/0J1237.1200.jpg?ebaed704919f924a6ae0dc6f1ef4c686&quot;,&quot;longest_side&quot;:800}]" data-picture-id="0J1237" data-picture-longest_side="800" src="https://a.pololu-files.com/picture/0J1237.300.jpg?ebaed704919f924a6ae0dc6f1ef4c686" /></td></tr><tr><th style="max-width: 300px"><p>MLX90614 temperature sensor connected to an Orangutan SV-168.</p></th></tr></table></td> </tr> </table>