Powering an RP2040-lcd-1.28 with 5V via battery connector?

Projects General Guidance
1

Hi there,

I know this is not a new question, but all I can find are answers for a full RP2040 board with a 5V input pin.

I have an RP2040-LCD-1.28 (https://www.waveshare.com/wiki/RP2040-LCD-1.28) and I want to power it with a 5V power supply, as I have to power other 5V devices.

Now, the LCD board provides no 5V GPIO but a lithium battery recharge/discharge header. From the schematics I found that behind the power supply there are two step-down converters: RT8193-18 and RT9193-33. Both can handle up to 5.5V. The battery charging chip is an ETA6096 which can handle up to 36V.

So my question is: Can I plug in my 5V at the battery header?

I am distrustful because I can't find anything where people did something similar, so I thought I'd ask in advance.

Bonus question: The original manual connected a 5V power supply directly to the VSYS GPIO and nobody cared about it, but after all I know, that is not a good idea, right?

Thank you for helping me out!

2

Please post a link to the datasheet. That sales site is not helpful.

3

Yep, that was not the intended link I wanted to post. I corrected it. I wanted to post this one:
https://www.waveshare.com/wiki/RP2040-LCD-1.28

The datasheet is here:
https://files.waveshare.com/upload/6/60/RP2040-LCD-1.28-sch.pdf

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