power.md

layout	title	permalink	sequence	power_tree
default	Power	/power	6	true

Main components

<table class="table is-fullwidth">
  <thead>
    <tr>
      <th>Chip #</th>
      <th>Description</th>
      <th>Operating Voltage</th>
      <th>Output Voltage</th>
    </tr>
  </thead>
  <tbody>
    <tr>
      <td><a href="https://cdn.sparkfun.com/datasheets/Dev/Arduino/Boards/Atmel-42181-SAM-D21_Datasheet.pdf">SAMD21G</a></td>
      <td>MCU</td>
      <td><code>1.62V</code> to <code>3.63V</code></td>
      <td></td>
    </tr>
    <tr>
      <td><a href="https://www.vishay.com/docs/82459/tsop48.pdf">TSOP4383</a></td>
      <td>IR Receiver</td>
      <td><code>2.5V</code> to <code>5.5V</code></td>
      <td></td>
    </tr>
    <tr>
      <td><a href="https://docs-apac.rs-online.com/webdocs/1674/0900766b816747ad.pdf">SIR-56ST3F</a></td>
      <td>IR LED Emitter</td>
      <td><code>1.3V</code> to <code>1.6V</code></td>
      <td></td>
    </tr>
    <tr>
      <td><a href="https://www.silabs.com/documents/public/data-sheets/Si7021-A20.pdf">Si7021-A20</a></td>
      <td>Temperature and humidity sensor</td>
      <td><code>1.9V</code> to <code>3.6V</code></td>
      <td></td>
    </tr>
    <tr>
      <td><a href="https://docs-apac.rs-online.com/webdocs/151f/0900766b8151fea1.pdf">LD3985</a></td>
      <td>Low dropout voltage regulator</td>
      <td><code>2.5V</code> to <code>6.0V</code></td>
      <td><code>1.22 V</code>, <code>1.8 V</code>, <code>2.5 V</code>, <code>2.6 V</code>, <code>2.7 V</code>, <code>2.8 V</code>, <code>2.9 V</code>, <code>3 V</code>, <code>3.3 V</code>, <code>4.7 V</code></td>
    </tr>
  </tbody>
</table>

Circuit simulation

Simulation of the power management circuit with Falstad [File > Import from Text].

<br>
<a class="button is-primary" href="{{site.github.repository_url}}/tree/master/power">Download code</a>

{% highlight text %}{%- include_relative power/circuit-falstald.txt -%}{% endhighlight %}

<img src="{{ site.url }}/images/power/power-management.gif" alt="Power management circuit simulation">