[MinnowBoard] TurboT DualE board power by LSE header

[Van Der Pol, MarkX]

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.

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.

Thanks for sharing the update and photo! It looks great!

|\/|ark.

Mark van der Pol
Firmware Engineer,
Open Hardware Team,
Open Source Technology Center
Intel
Markx.van.der.pol at intel.com<mailto:Markx.van.der.pol at intel.com>

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.



From: elinux-MinnowBoard [mailto:elinux-minnowboard-bounces at lists.elinux.org] On Behalf Of Alex Bakhtin
Sent: Thursday, April 12, 2018 12:38 AM
To: elinux-minnowboard at lists.elinux.org
Subject: Re: [MinnowBoard] TurboT DualE board power by LSE header

Nobody sent a reply.
We made some testing and designed a simple PSU to check this idea. Everything is working fine.



[20180412_102636.jpg]


вс, 1 апр. 2018 г. в 1:31, Alex Bakhtin <alex.bakhtin at gmail.com<mailto:alex.bakhtin at gmail.com>>:
Hello.
    Is it possible to power the TurboT Dual-Ethernet - Dual Core board from LSE header?
    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).
    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.
    +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.
    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).
    Is it ok to supply 5VDC it from LSE header? Thank you.
Alex Bakhtin
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Alex Bakhtin
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Alex Bakhtin
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