ESP32 Quality Control Experiences.

NotMyRealName
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Joined: Thu Feb 13, 2020 1:35 am

ESP32 Quality Control Experiences.

Postby NotMyRealName » Thu Feb 13, 2020 1:59 am

Hi,

Just wondering if anyone using the ESP32 in production has experience with running large volumes of these in a production environment, and if you had any QC issues with the module itself.

We recently ran a short run (only 100 modules) and I had one faulty module with an internal short circuit on the SPI flash lines. It worked through programming (because I was only programming with the SPI in DIO mode), but failed to boot in QIO mode because two extra lines were shorted.

I could confirm this from outside the module by testing the pins with a multi-meter, so I got our production team to pop off the shield and I can see two adjacent pins shorted on the ESP micro.

I'm a bit surprised this wasn't picked up in testing or even visual inspection. I love the module in all other respects... just never seen a failure this simple in any other modules we use in production and it makes me a bit nervous.

Here is the part I bought (Sourced from Digikey so should be legitimate!):
https://www.digikey.com/product-detail/ ... ND/9381737

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