| Electronics > Beginners |
| Critique on PCB layout wanted |
| (1/4) > >> |
| 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? |
| Navigation |
| Message Index |
| Next page |