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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">It is under investigation – while the circuit works, there is a concern if the PCB traces from the LSE header to the regulator are sized big enough to handle
the current demands of the board and modules. It is supposed to be able to handle 3Amp, and I don’t know if that was actually implemented, and if that design rule was enforced into the board layout. And I don’t know what safety margin exists on the design
rule, if it was applied.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">So – as you discovered, it works fine. And, until the analysis is done on the trace current capacity, we don’t know if it is reliable. There is risk of it failing
under load. <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Thanks for sharing the update and photo! It looks great!<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">|\/|ark.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Mark van der Pol<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Firmware Engineer,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Open Hardware Team,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;background:white">Open Source Technology Center</span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;background:white">Intel</span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><a href="mailto:Markx.van.der.pol@intel.com"><span style="color:#0563C1">Markx.van.der.pol@intel.com</span></a><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">The MinnowBoard.org Foundation: a US-based non-profit providing education and promotion of the design and use of open-source software and hardware in embedded
computing on Intel® Architecture.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><a name="_____replyseparator"></a><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> elinux-MinnowBoard [mailto:elinux-minnowboard-bounces@lists.elinux.org]
<b>On Behalf Of </b>Alex Bakhtin<br>
<b>Sent:</b> Thursday, April 12, 2018 12:38 AM<br>
<b>To:</b> elinux-minnowboard@lists.elinux.org<br>
<b>Subject:</b> Re: [MinnowBoard] TurboT DualE board power by LSE header<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt">Nobody sent a reply.<o:p></o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt">We made some testing and designed a simple PSU to check this idea. Everything is working fine.
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<p class="MsoNormal">вс, 1 апр. 2018 г. в 1:31, Alex Bakhtin <<a href="mailto:alex.bakhtin@gmail.com">alex.bakhtin@gmail.com</a>>:<o:p></o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt">Hello.<o:p></o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"> Is it possible to power the TurboT Dual-Ethernet - Dual Core board from LSE header?<o:p></o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"> Right not we are testing how TurboT fits out project. TurboT could be one of the core components, but the whole device should be dual-powered (220V AC and 10-36VDC). From my point of view - this is a good
idea to desing a PCB on which we would install our PSU, and also provide a mounting space for TurboT - holes and connection to the LSE header (I think we would also use one uart from LSE header).<o:p></o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"> I checked the turbot schematics and I see that DC_IN_1 (power supply connector) is filtered by an LC filter, connected to protection curcuit and after that is connected to +PS_5VSB.<br>
+PS_5VSB is connected to pin 3 of LSE header and supply 5V power to the rest of the board. So, according to turbot schematics - we can supply +5V to the PS_5VSB directly and everything should be fine.
<o:p></o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"> In the turbot gerber files I can see that this pin is connected to polygon on Layer 06, and it seems that this polygon is directly connected to Q103 and FB1->U13 (3V power supply).<o:p></o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"> Is it ok to supply 5VDC it from LSE header? Thank you.<o:p></o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt">Alex Bakhtin<o:p></o:p></p>
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<p class="MsoNormal">-- <o:p></o:p></p>
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<p>Alex Bakhtin<o:p></o:p></p>
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<p class="MsoNormal">-- <o:p></o:p></p>
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<p>Alex Bakhtin<o:p></o:p></p>
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