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matherp
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Joined: 11/12/2012
Location: United Kingdom
Posts: 10089

Posted: 11:50am 22 Feb 2025

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Here is the latest schematic that is actually being built

0af96005-8757-4221-8bec-cfd0c5d3119f.pdf

I may have posted an older one before which did have a fault on the DVDD supply

Hope the boards will be with me in about a week and if all OK will post the gerbers then
Edited 2025-02-22 21:54 by matherp

WhiteWizzard
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Joined: 05/04/2013
Location: United Kingdom
Posts: 2927

Posted: 12:14pm 22 Feb 2025

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matherp said Here is the latest schematic that is actually being built

0af96005-8757-4221-8bec-cfd0c5d3119f.pdf

I may have posted an older one before which did have a fault on the DVDD supply

Hope the boards will be with me in about a week and if all OK will post the gerbers then

That is a nice minimalistic circuit for the RP2350B. Be really great to see the impact of this DVDD circuit….

matherp
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Joined: 11/12/2012
Location: United Kingdom
Posts: 10089

Posted: 02:43pm 25 Feb 2025

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The boards at JLC are just waiting pickup by DHL so hopefully with me in the next 3 or 4 days.

In the meantime I've done a "value-engineered" version of the board. This removes the power switch and reset controller, replaces a couple of "extended range" resistors with pairs of series "basic" components and replaces the boot and reset switches with the only "basic" switch. Together these changes will reduce the cost of the boards significantly.

I will be uploading both sets of gerbers once I've tested the received boards

Schematic:
85149361-7c56-4f4f-9bbf-d3c35891fab6.pdf

Edited 2025-02-26 00:55 by matherp

PhenixRising
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Joined: 07/11/2023
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Posted: 03:45pm 25 Feb 2025

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matherp said This removes the power switch and reset controller

I approve of this

bigmik

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Joined: 20/06/2011
Location: Australia
Posts: 2946

Posted: 07:11am 26 Feb 2025

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That looks really good Peter,

I am optimistic that it will be fully functional when they arrive.

Well done

Mick

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Mick's uMite Stuff can be found >>> HERE (Kindly hosted by Dontronics) <<<

matherp
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Joined: 11/12/2012
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Posts: 10089

Posted: 02:00pm 28 Feb 2025

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Works perfectly

Next job to fit a PSRAM and see if it affects the overclock.
Currently I've got the DVDD set to 1.35V which is less than I use with the internal switch mode supply.
Once all sorted I'll start a new thread with a sensible title to post the gerbers

Volhout
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Joined: 05/03/2018
Location: Netherlands
Posts: 4918

Posted: 02:07pm 28 Feb 2025

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Hi Peter,

Is it essential to have option heartbeat. GP25 is not affected by "pico off" right ?
Only GP23,GP24, GP29.

Volhout

PicomiteVGA PETSCII ROBOTS

matherp
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Posts: 10089

Posted: 02:23pm 28 Feb 2025

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Now we are cooking

heartbeat defaults to off for RP2350B

Mixtel90

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Joined: 05/10/2019
Location: United Kingdom
Posts: 7584

Posted: 02:24pm 28 Feb 2025

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That would make sense. GP25 doesn't need to be controlled by PICO OFF as it has its own options.

hehe - Nice one Peter. :)
Pico 2x1.6 ;)
Edited 2025-03-01 00:25 by Mixtel90

Mick

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