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kr4sh
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kr4sh Asks: FT231XS FTDI USB UART self-powered circuit
I haven't been able to find a full example of a self-powered FT231XS circuit. I was hoping to get feedback on what I have put together from studying the datasheet (any glaring issues?):
3v3_RUN is my 3v power rail from my separate regulator
I was a little unsure about connecting VCC to VCCIO, 3V3OUT, and RESET. From reading the datasheet it sounds like you need to do this if powering the FTDI chip via 3v. If I had say a 5v supply, I think you would not connect VCC to the other power pins. Wondering if I'm interpreting this correctly.
I'm also wondering what would happen if the 3v supply were turned off, but USB was still plugged in.
FYI I'm not a professional, EE is a hobby for me.
Datasheet description of power pins:
Datasheet self-powered diagram:
Datasheet wording regarding self-powered usage:
I haven't been able to find a full example of a self-powered FT231XS circuit. I was hoping to get feedback on what I have put together from studying the datasheet (any glaring issues?):
3v3_RUN is my 3v power rail from my separate regulator
I was a little unsure about connecting VCC to VCCIO, 3V3OUT, and RESET. From reading the datasheet it sounds like you need to do this if powering the FTDI chip via 3v. If I had say a 5v supply, I think you would not connect VCC to the other power pins. Wondering if I'm interpreting this correctly.
I'm also wondering what would happen if the 3v supply were turned off, but USB was still plugged in.
FYI I'm not a professional, EE is a hobby for me.
Datasheet description of power pins:
Datasheet self-powered diagram:
Datasheet wording regarding self-powered usage:
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