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<p>I have found an interesting looking solution for USB C on the
internet. This is from a datasheet of a USB C Power Delivery
controller and should also be useful for the laptop because
current be transferred in two different directions as well. The
setup uses different MOSFETS for controlling the current and has
the ability to route it to a different location depending on the
current direction. However, you still need a switch (in this case
two but they are complementary). Additionally, you could use this
to charge the battery and separate it from the rest of the system,
if power is incoming from the card, and if the card needs power,
you can simply switch it to the 5v system which should be
constantly connected to the battery (boost converter).</p>
<p>You can find it on page 20 in the top left corner in this
(<a class="moz-txt-link-freetext" href="http://t224.mjt.lu/lnk/ADsAAGisXE4AAAAAAAAAAGbE2wkAASHlFNUAAAAAAAZHgABYsIr7xoBS8XQ6Q_GTvZDL1zLxUQAGAjk/1/6Bto_5nkfU7jKIABqwUo6A/aHR0cDovL3d3dy5jeXByZXNzLmNvbS9maWxlLzE0MDk3Ni9kb3dubG9hZA">http://www.cypress.com/file/140976/download</a>) datasheet.</p>
<p>Julius Lehmann<br>
</p>
<div class="moz-cite-prefix">On 23.02.2017 09:43, Luke Kenneth
Casson Leighton wrote:<br>
</div>
<blockquote
cite="mid:CAPweEDy991FmogoJMAi0LTUG1jFBu3BV0bSBLx4On19TOOK+4A@mail.gmail.com"
type="cite">
<div dir="ltr"><br>
<div class="gmail_extra"><br clear="all">
<div>
<div class="gmail_signature"
data-smartmail="gmail_signature">---<br>
crowd-funded eco-conscious hardware: <a
moz-do-not-send="true"
href="http://t224.mjt.lu/lnk/ADsAAGisXE4AAAAAAAAAAGbE2wkAASHlFNUAAAAAAAZHgABYsIr7xoBS8XQ6Q_GTvZDL1zLxUQAGAjk/2/7ibsrn--Otb_plFC47onQA/aHR0cHM6Ly93d3cuY3Jvd2RzdXBwbHkuY29tL2VvbWE2OA"
target="_blank">https://www.crowdsupply.com/eoma68</a><br>
</div>
</div>
<br>
<div class="gmail_quote">On Wed, Feb 22, 2017 at 6:35 PM,
Internet <span dir="ltr"><<a moz-do-not-send="true"
href="mailto:internet@devpi.de" target="_blank">internet@devpi.de</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
<div bgcolor="#FFFFFF" text="#000000">
<p>The power issue is pretty tough I think. Do you want
to allow charging from both sides (12v dc jack and
eoma-5v0)</p>
</div>
</blockquote>
<div><br>
</div>
<div>yes. </div>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
<div bgcolor="#FFFFFF" text="#000000">
<p>or does the power from the card only act as
additional power for the system (without charging and
just taking the load off the battery)?</p>
</div>
</blockquote>
<div><br>
</div>
<div>no. an OTG cable into the EOMA68 Card should be
capable of charging (not necessarily *running* the system
as it's far too much current required). </div>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
<div bgcolor="#FFFFFF" text="#000000">
<p> How do you want to control the power switch (SY6280)
and detect whether the card is passive or active
(taking power/providing power)?</p>
</div>
</blockquote>
<div> usual OTG software detection, then communicated
(quickly) to avoid any current bun-fights. OTG generates
IRQs from the cable being plugged in (usual way) - the
extra bit will be to ensure that the required GPIOs are
pulled high/low - there's quite a few.</div>
<div><br>
</div>
<div>l.</div>
</div>
</div>
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