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Forum Index : Microcontroller and PC projects : PicoMite RP2350B DIL Development board, 16Mb flash + 8 MB PSRAM

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matherp
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Joined: 11/12/2012
Location: United Kingdom
Posts: 10172
Posted: 04:51pm 27 Jun 2025
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Slightly modified layout based on constructive (blunt) criticism on the Raspberry Pi forum. Probably makes no functional difference but definitely better.

Gerber_PCB1_2025-06-27.zip


BOM_Board1_PCB1_2025-06-27.zip
 
PhenixRising
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Joined: 07/11/2023
Location: United Kingdom
Posts: 1326
Posted: 04:58pm 27 Jun 2025
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Is there a prize for guessing? I ain't gonna win  
 
matherp
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Joined: 11/12/2012
Location: United Kingdom
Posts: 10172
Posted: 05:10pm 27 Jun 2025
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  Quote  The power layout (looking at the image on the site you linked to) seems poor. Obviously it's constrained by being 2-layer and narrow, but the track running under the chip to connect the boot button is inexcusable - cutting off the ground to the decouplers on the left hand side, when there's plenty of space to take it up the edge close to the row of DIL pins. Also R87 (boot switch resistor) is in the wrong place - should be close up to the flash chips such that the long wire leading to the boot switch doesn't load/put reflections on the timing-critical flash nCS. C101/102/109 all sharing a (distant) GND via isn't ideal either.
 
PhenixRising
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Joined: 07/11/2023
Location: United Kingdom
Posts: 1326
Posted: 05:18pm 27 Jun 2025
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I cut the ground off also but as Mick pointed-out, the circuit continuity-test in SL6 made it obvious. Such a great layout tool.  
 
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