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I'm trying to replace a wire from my camera's dummy battery from it's PCB -> barrel jack -> USB A cable to just female USB C.

I've got ready made USB-C female to 4 bare conductors cable. I've Soldered Vbus and GND pins to + and - poles on dummy battery PCB and this setup will happily run when powered from very old 5V USB A charger via USB A to C cable, however my newer USB PD charger won't recognize it. Neither my USB C power bank will, with its built-in USB C cable.

Original dummy battery would work via its original USB A -> Barrel Jack -> Dummy battery cable on the new PD power bank.

I've destructively disassembled both the USB A to barrel jack cable and dummy battery itself but I can't see anything that would differ original setup from mine. No circuitry, data pins in the plug not connected to anything, no sign of any other components.

How do I make my cable (which in the end the dummy battery becomes, just + and - on the bare pcb, no other components) be recognized by PD chargers and power banks? I don't need it to supply anything more than 5V 1A.

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You need 5.1 kohm resistors on the CC pins to signal that there is a device connected which requires 5V supply.

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  • \$\begingroup\$ Huh, so if usb-c breakout board only has G, D1, D2 and V there is no way to make it work? \$\endgroup\$
    – gmp
    Commented Oct 9 at 21:50
  • \$\begingroup\$ @gmp Nope. But the breakout board may contain a place for adding a resistor. But you need to know if the resistor is a pull-up (for supply side) or a pull-down (for device side), so you might still have a wrong breakout board. We don't know what you bought. Which exact breakout board you have? \$\endgroup\$
    – Justme
    Commented Oct 9 at 22:00
  • \$\begingroup\$ I desleeved cables I ordered for this project and these have JRC-B008 board inside. Which according to this thread has CC pads exposed on the back side. Guess I can reuse them after adding the resistor. Thanks for the help! \$\endgroup\$
    – gmp
    Commented Oct 9 at 22:10

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