Hello! I am having trouble getting my Sparkfun power delivery board STUSB4500 to accept any of the PDO options. I am trying to pull 9 volts from a portable li-ion battery that has power output options of 5V/3A, 9V/2A, and 12V/1.5A. Here are the NVM values I set stored on my power delivery board. […

The R4 is what holds the program that you’re uploading & saving; the Power Delivery Board isn’t a standalone device, it requires an MCU. Can you power the R4 from the battery pack as well?

Thank you for your quick reply! In the Power Delivery Board - USB-C (Qwiic) Hookup Guide page, there is an intro video where Rob Reynolds at minute 2:44 says “And, one of the nice things is once you programmed it (the power delivery board), you no longer need a microcontroller because the board can…

Can you share a photo of the board’s connections?

Thanks! Also apologies for earlier, I was mistaken about how that board operates! Does it work as expected if you plug the usb-A end into a 9v 2a (or more) wall wart? I’m wondering if the battery bank is also trying to do a negotiation behind it and tossing a wrench in the works

All good! I tried what you suggested and connected the power delivery board to a computer charger that was plugged into a wall socket, and it worked! Thank you! The power delivery board negotiated as expected and I was able to pull 9V consistently! While I am glad that the power delivery board work…

You could try a few things: usb-c to usb-c cable might be able to handle the handshaking (instead of the usb-a to usb-c being used) Try a PD Trigger/Decoy…I’d prefer one with solderable (or regular) jumpers to select the PD settings. If for some reason you can’t use usb-c as above you can a…

STUSB4500 Pwr Delivery Board isn't accepting any PDO

Qwiic System

Maria1 February 7, 2026, 8:59pm 9

Using a usb-c to usb-c cable worked! Thank you so much for all of your help. You are a life saver!

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STUSB4500 Pwr Delivery Board isn't accepting any PDO

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