Cannot charge an iPhone 16 using two USB-C breakout boards

Components & Accessories Power
1

I have a project where I am using two USB-C horizontal breakouts with all 6 wires connected to both breakouts.

When I connect a USB-C cable between a power charger and my dev board and a 2nd USB-C cable to my iPhone SE (using a USB-C to Lightning adapter), I can charge my phone.

However when I try to connect my iPhone 16 without the Lightning adapter, it won’t charge. It will charge if I unplug the iPhone 16 from the dev board and plug in a MagSafe charger pad, the iPhone 16 will charge from that.

Has anyone come across this before?

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2

It sounds like the adapters have an internal IC or something that negotiates with the Apple device and needs it there to function normally

3

I ordered another USB-C horizontal breakout and after some more experimenting, I ultimately found that if you remove the two 5.1K resistors on the CC1 and CC2 pins, it will charge the iPhone 16.

I ordered a couple more breakout boards for USB ports from Sparkfun–one was a USB Type A female and I verified that if you plug a USB Type A to USB-C cable, that it will charge the iPhone 16.

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1 Like
4

Awesome! Good job

5

Hello, I read this with great interest as I have two USB-C sparkfun connectors with the same problem. I followed the advise to remove the 5.1k resistors but alas did not do the trick for me.
I have a super simple case, as I just have vbus and ground connected between then two boards: usb-c in from charger and I was hoping to get charge function from the other board. I also feed a small fan from this setup , cannibalising from the connection between the board (which is the reason for this setup).

Do I need some connection on the other pins to get things to work or is something else wrong with this?

6

Not usually, but Apple products seem to prefer Apple chargers :-/ Does it work as expected with other usb-c devices?