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Electronics => Microcontrollers => Topic started by: ledtester on June 15, 2021, 02:18:44 am

Title: Microcontroller boards with USB protection diodes?
Post by: ledtester on June 15, 2021, 02:18:44 am

Hi all!

I was wondering if there are any microcontroller boards which have some sort of USB capability (e.g. either a USB-UART chip or the microcontroller itself has USB capability) and the board has USB protection diodes protecting the lines.

I suppose I could just take the design files for something like a STM32 Bluepill and just add them, but if there was a module available for sale that already had them so much the better.

Title: Re: Microcontroller boards with USB protection diodes?
Post by: PCB.Wiz on June 15, 2021, 04:44:44 am

 The EFM8UB3 Thunderboard shows a SP1001-04 ESD protection diode.
and I see the EFM32 Happy Gecko Starter Kit shows PRTR5V0U2F ESD protection diode.

Title: Re: Microcontroller boards with USB protection diodes?
Post by: mac.6 on June 15, 2021, 07:13:40 am

Any serious dev boards made by reputable manufacturer will have them (ie, no cheap blue/black/red pill)...

Title: Re: Microcontroller boards with USB protection diodes?
Post by: peter-h on June 15, 2021, 02:18:56 pm

USB protection is best done with a sturdy standalone clamping device e.g. USBLC6-2

(https://peter-ftp.co.uk/screenshots/20210615083301815.jpg)

Anything anybody can put on a uC chip is not going to cut the mustard, as they say :)