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My project uses a BME280 for measuring temperature and humidity. This device requires 2 capacitors but also thermal decoupling from the rest of the board.
Because I won't be doing a copper fill near the BME280, I need to decide whether the caps should be closer to the ground plane or closer to...
In the AMS1117 datasheet that you can have a crowbar circuit on the AMS1117. If I add that to my board, would that be safer than leaving the input floating?
Also, general question, how do voltage regulators like AMS1117 behave when input and output are shorted. Do they act as passive devices or...
Let me see if I understand.
You guys are saying I can use the AMS1117 to power both boards at 3.3V. The AMS1117 would be powered from the 5V USB line during programming, and from barrel jack at production time.
The datasheet of the CP2102N shows a configuration for ignoring the internal voltage...
I have a PCB design with an onboard uC (ESP32-WROOM-32D) and voltage regulator (AMS1117-3.3).
The PCB doesn't have USB comms or power, so I want to have a separate "bootstrapping" board which has those things and connects to the uC via a 4-pin header.
Should I add a diode to protect the voltage...
OK, so just to reiterate:
If my design provides power via USB only, there is no purpose to having that diode. And the presence of the diode is a violation of USB specifications anyway.
Do I have that right?
Hah! I guess it's obvious :) My plan is to copy the design and physical layout from the dev boards I'm using as much as possible.
I'm glad I asked about this. I found a lot of articles about "bypass capacitors" for IC pins. Am I on the right track?
In my design, I'm adding copper fill for GND...
I'm trying to design a custom PCB for my ESP32 DevKitC project.
Fortunately, schematics for the DevKitC are available for download here.
There are just a few things I don't understand:
Why are there so many capacitors between VDD33 and GND? Can't these all be replaced by a single capacitor...
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