<div dir="ltr"><div>Ok, I understand it a bit better now. Thank you :-)<br><br></div>I'm starting to realize I have been using laptops for years and I know nothing about how they works.<br><div><div><br><div class="gmail_extra"><br><div class="gmail_quote">2016-08-29 21:52 GMT+02:00 Luke Kenneth Casson Leighton <span dir="ltr"><<a href="mailto:lkcl@lkcl.net" target="_blank">lkcl@lkcl.net</a>></span>:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><span class="">---<br>
crowd-funded eco-conscious hardware: <a href="https://www.crowdsupply.com/eoma68" rel="noreferrer" target="_blank">https://www.crowdsupply.com/<wbr>eoma68</a><br>
<br>
<br>
</span><span class="">On Mon, Aug 29, 2016 at 8:15 PM, Raphaël Mélotte<br>
<<a href="mailto:raphael.melotte@gmail.com">raphael.melotte@gmail.com</a>> wrote:<br>
> Of course ! I forgot the touchpad actually had an lcd. It will be so great<br>
> to be able to have some of those displayed right below the keyboard ! :-)<br>
> I just saw the power button that's connected to the STM32F072 when looking<br>
> for something else.<br>
> If I got it right, PCB1 receives the CPU card and powers PCB2<br>
<br>
</span> nope. PCB3 powers PCB2, which (through the STM32F) controls the<br>
Battery / Power IC on PCB3, through which power to PCB1 is controlled.<br>
<br>
yes it literally has to be that complex because EOMA68 power is<br>
"OTG-like" i.e. may be *TWO-WAY*. so the STM32F072 is responsible for<br>
monitoring (through I2C in communication with the Battery / Power IC)<br>
what is going on, also receives notification about power provision<br>
from the EOMA68 Computer Card, and makes decisions whether to put the<br>
Power IC into "OTG Host" or "OTG Client" power modes.<br>
<br>
look up the datasheet on the bq24193 for details.<br>
<span class=""><br>
> which contains<br>
> the STM32F072. Does that mean that a CPU card have to be plugged in in order<br>
> for the STM32F072 to be powered ?<br>
<br>
</span> incorrect. the STM32F072 is powered continuously it can never be<br>
powered off (short of opening up the laptop case and physically<br>
disconnecting the battery).<br>
<span class="HOEnZb"><font color="#888888"><br>
l.<br>
</font></span></blockquote></div><br></div></div></div></div>