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Qualcomm Quick Charge detecting compatible devices

How does Qualcomm Quick Charge sense the presence on another compatible device.

Isit looking for voltahe on certain USB pins?

Reply to
Pamela
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It's looking for a quick-charge chip at the other end of the USB cable.

Reply to
Jasen Betts

Basically, yes. There's a whole negotiation process which takes place between the device, and the dedicated charging port. Take a look at the data sheet for the On Semiconductor NCP4371 for some of the details.

Reply to
Dave Platt

søndag den 26. juni 2022 kl. 00.07.44 UTC+2 skrev Dave Platt:

and QC4 now also supports USB-PD over USB-C I assume in preperation for the EU mandate that phones/tablets etc. must charge via USB-C, and support USB-PD if the higher power is needed

Reply to
Lasse Langwadt Christensen

I found it here.

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It looks rather complicated to me but it seems there's some suprisingly elaborate signalling involved. Figure 20 seems to suggest that 2 if not 3 leads get utilised for signalling.

Reply to
Pamela

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