https://bitwizard.nl/wiki/index.php?action=history&feed=atom&title=Talk%3AReducing_power_consumption_of_a_raspberry_Pi 2026-04-05T19:58:01Z Revision history for this page on the wiki MediaWiki 1.35.6 https://bitwizard.nl/wiki/index.php?title=Talk:Reducing_power_consumption_of_a_raspberry_Pi&diff=2695&oldid=prev 2013-12-30T08:23:09Z

<p></p> <table class="diff diff-contentalign-left diff-editfont-monospace" data-mw="interface"> <col class="diff-marker" /> <col class="diff-content" /> <col class="diff-marker" /> <col class="diff-content" /> <tr class="diff-title" lang="en"> <td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">← Older revision</td> <td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 08:23, 30 December 2013</td> </tr><tr> <td colspan="2" class="diff-lineno">Line 9:</td> <td colspan="2" class="diff-lineno">Line 9:</td> </tr> <tr> <td class="diff-marker"></td> <td class="diff-context diff-side-deleted"><div>Regards,</div></td> <td class="diff-marker"></td> <td class="diff-context diff-side-added"><div>Regards,</div></td> </tr> <tr> <td class="diff-marker"></td> <td class="diff-context diff-side-deleted"><div>Ben</div></td> <td class="diff-marker"></td> <td class="diff-context diff-side-added"><div>Ben</div></td> </tr> <tr> <td colspan="2" class="diff-empty diff-side-deleted"></td> <td class="diff-marker" data-marker="+"></td> <td class="diff-addedline diff-side-added"><br /></td> </tr> <tr> <td colspan="2" class="diff-empty diff-side-deleted"></td> <td class="diff-marker" data-marker="+"></td> <td class="diff-addedline diff-side-added"><div>VDD_BAT is now tied to the +5V, right? </div></td> </tr> <tr> <td colspan="2" class="diff-empty diff-side-deleted"></td> <td class="diff-marker" data-marker="+"></td> <td class="diff-addedline diff-side-added"><br /></td> </tr> <tr> <td colspan="2" class="diff-empty diff-side-deleted"></td> <td class="diff-marker" data-marker="+"></td> <td class="diff-addedline diff-side-added"><div>You need to know where the 5V goes to analyse what will stop working when you "lose" the 5V.... </div></td> </tr> <tr> <td colspan="2" class="diff-empty diff-side-deleted"></td> <td class="diff-marker" data-marker="+"></td> <td class="diff-addedline diff-side-added"><br /></td> </tr> <tr> <td colspan="2" class="diff-empty diff-side-deleted"></td> <td class="diff-marker" data-marker="+"></td> <td class="diff-addedline diff-side-added"><div>* The CPU will work with a voltage from (I expect) 3.0V up to 5.5V. No problem. (most designs with this chip will tie it to the lipo battery voltage 3.2 to 4.2V, but raspberry pi ties it to 5V, and quotes an absolute maximum of 5.5V)</div></td> </tr> <tr> <td colspan="2" class="diff-empty diff-side-deleted"></td> <td class="diff-marker" data-marker="+"></td> <td class="diff-addedline diff-side-added"><br /></td> </tr> <tr> <td colspan="2" class="diff-empty diff-side-deleted"></td> <td class="diff-marker" data-marker="+"></td> <td class="diff-addedline diff-side-added"><div>* The 5V is used to create 3.3V through an LM1117-3.3 . This is no problem if you supply the 3.3V by other means. (The LM1117 will probably die if its input becomes significantly lower than its output, but we're planning on tying them together, so no problem). </div></td> </tr> <tr> <td colspan="2" class="diff-empty diff-side-deleted"></td> <td class="diff-marker" data-marker="+"></td> <td class="diff-addedline diff-side-added"><br /></td> </tr> <tr> <td colspan="2" class="diff-empty diff-side-deleted"></td> <td class="diff-marker" data-marker="+"></td> <td class="diff-addedline diff-side-added"><div>* 5V for the USB ports. If you don't have USB devices, or connect them through a powered hub this can be OK. </div></td> </tr> <tr> <td colspan="2" class="diff-empty diff-side-deleted"></td> <td class="diff-marker" data-marker="+"></td> <td class="diff-addedline diff-side-added"><div>* 5V for the HDMI port. I have a bunch VGA screens leftover, and little HDMI screens, so I have a few of those HDMI to VGA converters lying around. These use the 5V on the HDMI port and won't work off 3.3V. If you're not using a screen or using one with HDMI, no problem. </div></td> </tr> <tr> <td colspan="2" class="diff-empty diff-side-deleted"></td> <td class="diff-marker" data-marker="+"></td> <td class="diff-addedline diff-side-added"><br /></td> </tr> <tr> <td colspan="2" class="diff-empty diff-side-deleted"></td> <td class="diff-marker" data-marker="+"></td> <td class="diff-addedline diff-side-added"><div>So... with two caveats, yes that's possible!</div></td> </tr> <!-- diff cache key wikidb:diff:wikidiff2:1.12:old-2694:rev-2695:1.13.0 --> </table>

Rew https://bitwizard.nl/wiki/index.php?title=Talk:Reducing_power_consumption_of_a_raspberry_Pi&diff=2694&oldid=prev 2013-12-30T07:20:03Z

<p>Created page with &quot;Re: Eliminating the 12V-5V converter in your low-power Raspberry Pi implementation Dear BitWizard, I have found your page most helpful in my own hack. I have duplicated your...&quot;</p> <p><b>New page</b></p><div>Re: Eliminating the 12V-5V converter in your low-power Raspberry Pi implementation<br /> <br /> Dear BitWizard,<br /> <br /> I have found your page most helpful in my own hack. I have duplicated your work and it works; Thank you!<br /> <br /> I realized that VDD_BAT merely needs to be tied to 3.3V for it to work. There is no need to include a second 12V to 5V converter specifically for VDD_BAT. I have verified this with my setup and it led to further power saving (1.524W down to 1.44W at idle). Please consider trying it on your own Raspberry Pi too!<br /> <br /> Regards,<br /> Ben</div>

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