YO, my fellow Hardware hackers. So I am trying to integrate the E-Series into an eagle project of mine but I have failed and was wondering if anyone out there would like to give me some pointers on it. I had some boards made and I must of Fried my e-series chip. if you were going to hook up a chip via USB would you step down the 5v to 3v3 ? Also, would you ground all the system grounds.
You cannot power the E Series module from 3V3 because the cellular modem requires 3.7V. On the E Series module, 3V3 is an output.
And you most likely did not fry the module. You’re missing a connection between VDDA and 3V3. They’re right next to each other and you can rework that easily by hand soldering a jumper wire.
The STM32 MCU won’t boot if VDDA is not powered.
There’s a very simple E Series design in Eagle CAD in this tutorial.
Thank you. I will give this a try. =)
So I think for the sake of keeping track of this experiment. I am going to keep posting here. But I have made some proto boards from the link you provided. I will get them in the mail soon. Super excited to test them out. I will update with pictures of my build.
also I use allpcb.com they are really good. and they have awesome prices
here is the missing part
Nice work! I love seeing the progress here. It gives me a little motivation to eventually try a SOM as well. Keep the progress and pictures coming!
This board has to be powered with USB and the Lipo battery to register via USB.
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