Electronics > Beginners
Critique on PCB layout wanted
permal:
Here's you chance to smack my fingers and tell me all the wrongs I've done in this layout. Please keep it friendly :)
For various reasons I need to connect both the SPI and MMC interface to my MCU. To do that I opted to use a MAX4948 which will be controlled by a switch (previously discussed here), with the MMC interface on the NC-path. The wires are all matched to the same length between MCU/MAX4948 (40mm) and MAX4948/SDCard (31mm) holder, except for the CLK signal that is 1 mm longer (I read that was important somewhere). The image only contains the signal wires, no ground planes (obviously) or power.
Personally I think there are too many wires crossing, but I can't move the pins on the MCU and no matter how I turn the MAX4948, there are always some wires that gets crossed so this is as few as I can get.
Thank you in advance.
ataradov:
What is the MCU? Are you sure it can go anywhere close to the frequencies at which length-matching does anything?
I would say that you 100% don't need it.
Where are the board outlines?
With all the meandering, it is hard to tell, but it looks like the number of vias can be reduced.
permal:
The MCU is an ESP32.
If I understand it correctly, it can go up to 40MHz with the MMC ifc.
ataradov:
This is not fast enough on such a small board, don't worry about it.
In Vacuo Veritas:
What is it with n00blers putting length matching everywhere? |O
Do you also put thrust-reversers on bicycles?
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