I2C and SPI on a PCB Explained!

Tech Consultant Zach Peterson looks at two very important protocols for integrated circuits: I2C or Inter-Integrated Circuit Protocol and SPI or Serial Peripheral Interface Protocol. Zach examines how these two common protocols are used on the PCB, as well as a few of the factors that influence their operation.

0:00 Intro
0:42 I2C Overview
3:18 Rise Time?
5:44 SPI Overview
9:47 Trace Impedance

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[lbgstzockt]

The fact that all this knowledge is available for free here is amazing, thanks to Altium for making these videos and thank you Zach for explaining so well!

[exapod]

Excellent explanation of the SPI "impedance matching".

[myetis]

I love this channel because it teaches how to fish instead of giving fish. Thanks my best HW teacher Zach Peterson :)

[user.w]

I have seen such resistors with an SPI memory design, and that stayed looping in my mind looking to what the use of such small resistors and why not something high like driving a diode (At level of 100's or K's).
Thank you very much for educative video is comes on time for me. BTW, I like your PCB series, it is hard to find such resources and learn about hidden tricks.

[eduardohernandotorres]

Great video as always with Zachariah! Years of using I2C and SPI Buses just following the guidelines (and it always worked) but I had never stopped to think that the limitations were related to the OpenDrain and pushpull topollogies of each one.
I love these videos because they make you actually think and understand what you are doing.

[hariharan]

It can't get anymore simple than this. Thank you soo much howtobasic!

[manyirons]

Clear, informative, and exactly my speed. Thank you!

[spencerhanson]

I appreciate SO much that you say what abbreviations are! If anyone disagrees, find an abbreviated diagram of the coagulation cascade, Kreb Cycle, or any other biological diagram. If you understood those without prior knowledge of what those abbreviations stood for, I'll tone down my excitement. 😄

[christopherleadholm]

Thank you for this. Confirmed a few things I had already thought. Awesome.

[RedRacconKing]

Very useful info for my undergrad senior project! Thanks, Zack!

[leeslevin]

Fantastic, thank you for clearing up the misconceptions regarding Impedance matching, until now I wasn't sure if I should implement controlled impedance for I2C & SPI.

[Bianchi]

Nice info, well done, thanks for sharing it with us :)

[shafi.j]

Old electronics servicing peoples like me 40 years before studied person will not not these communication but we are trying to work in this your videos is very useful 👍

[khanglam]

Awesome
Video!
Wanted to know how to test these peripherals In a software testing role

[tolikche]

Thanks for the video) Can you talk more about SPI bus tips and tricks like optimal level shifting technics or pull-up/down resistors.

[Lionel_Walder]

Merci beaucoup, ça me démystifie ces 2 protocoles dont l'I2C que je prévois de faire un PCB

[amyzhu]

Hi Zach, i'm studying on I2C electrical specification recently.
and i have a question on the validation item--> setup time for re-start condition.
i'm wondering why it's more important to define setup time for re-start condition than setup time for START condition?
i think it's neccessary to define setup time for start condition since there's always a START on every transmitting procedure.
but the re-start condition isn't that frequently appeared.
do you have any idea on this?
appreciate if you reply, thanks

[gazzacroy]

really good video cool stuff, very helpful :)

[sailtogether]

Thank you! Please tell us more themes about developing PCBs.

[AleTheGoat]

Very informational video that clearly describes how I2C and SPI work on a PCB. My question is how would a layer stack up look like for those examples?