RP2040 KiCad 6 Hardware Design - Part 1 - Schematic

This is the first in a three part (most likely) series where I design, assemble, and test a RP2040 based PCB. This will be a simple evaluation board that is designed to fit on a standard breadboard.
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MicroType Engineering is a full service electronics and mechanical product design firm. We offer turnkey support no matter how far along in the design process you are. We have full schematic capture, PCB design, firmware, mechanical design, and prototype/small-batch assembly services. Please reach out to learn more! microtype.io/

[@rene-jeanmercier6517]

I would add a 10k0 to each MOSFET from Gate to GND to avoid LED flashing glitch on power-on.

[@canadianavenger]

I know this is a year old now, but just came across this today. With USB you always want the resistors to be placed close to the chip. Yes it is bi-directional and as a general rule, for bidirectional lines, you can place them in the middle. But on a long transmission line you actually what them at both ends of the line at each of the transmitter/receivers. Your typical USB link is a long transmission line, in fact you likely only have one end of the link on the board. The USB spec has taken this into account and specifies the resistors at both ends. Some chips integrate them, so you don't need to include them on-board in that case.

[@vatterger]

Regarding the USB capacitance limit: you can AFAIK use a "soft-start+switch+current-limit" IC like the "MT9700" (costs 4 cents in large quantities) to decouple the USB input from your circuit in terms of instantly visible capacitance.

[@tinfever]

That's a nice part. Cheap and in-stock. Hard to compete with that. Closest western counterpart from Diodes Inc or TI is at least 5x the cost.

[@Sembazuru]

As an argument FOR putting all those possibly unnecessary resistors/caps in, extra solder pads cost nothing extra, and hand-modifying a board to add them takes time and potentially ruined boards. Yeah, zero ohm resistors aren't free, but they are cheap and I'm sure you factored that into your cost evaluations. (If not on this board, some time in the past to use as a general rule for the future which is now.)

[@YoutubeBorkedMyOldHandle_why]

Wow ... super video. I'm amazed at how you manage to both talk and build your schematic at the same time, and still keep such a quick pace. I just ordered a few rp2040 chips a few days ago. No real plans for them yet ... but they were cheap and available. This will be very helpful, so I'll probably make something very similar. Good thing you caught that dead short at the end ... it was bugging me all the way through the video.

[@arthurswanson3285]

Great tip for using the oscillator instead of playing around guessing crystal balancing capacitaince.

[@Excalibur32]

Always enjoy your walkthroughs and explanations

[@petermuller608]

The oscellator recommendation is really interesting! For hobby applications I always recommend to just use an rpi pico instead unless space is restricted But for those rare occasions where you want ~1 and are space restricted, this is better than iterating on a crystal design :)

[@lucalanzi9345]

Fantastic Video, thank you! On a side note, it may be helpful to provide us with the libraries you are using. I had a hard time finding the voltage regulator symbol on the web, or maybe let us know we can use alternatives in case we cannot find the symbol online to add to our libraries

[@Nebulorum]

Really nice video. Your ESD notes are really interesting.

[@WalterCervini]

NIce video bro, but you have a short circuit between pin 43 and GND, only remove the wire between the first capacitor near +3v3 supply and GND

[@ReviveMeAlive]

I want to thank you! I am new to this and it helped immensly!

[@platin2148]

Question do i have to add a TVS diode for each pin that i expose?

[@Graham1904]

Surely decouple caps should be 100n not 1u ?

[@gregwoolley]

Excellent! Thank you.

[@petermuller608]

I have never seen an application note recommending putting resistors on USB lines. Could you provide a reference? Also the QSPI lines

[@brantwinter]

When you say 0603 and 0805 are you talking metric or imperial?

[@embeddedautomation2464]

These numbers refer to standard footprints for SMD parts like capacitors and resistors. He also mentioned 0402 capacitors.

[@antoniocardenas4678]

Good design easy to start it!

[@fwily2580]

Upspeak is hard for me to understand

[@RixtronixLAB]

Nice video, thanks :)

[@krishnawa_]

Which library are you using (components)?

[@Sembazuru]

Looks like his own because of the dedicated values on resistors & capacitors, and him mentioning specific package sizes when dropping those jellybean parts. Though that USB connector looks like it came from the standard parts libraries that come with KiCAD. But if he doesn't have to assign a footprint, he already did that in his own library...

[@MicroTypeEngineering]

@Christopher Elliott, Correct. I'll sometimes use the default symbol (USB-C connector) and just save it in my own.

[@ankushathawale3473]

Why I am Not getting same RP 2040 I am Getting something Different !

[@svendepoorter620]

Fyi, At kzbin.info/www/bejne/iH-rXnaCbaylfJo, you can just draw the upper line and then press the "insert" key as many times you want to repeat instead of copying the lines.

[@sherrihouse4116]

💘 pքɾօʍօʂʍ