• Qualcomm Quick Charge detecting compatible devices

    From Pamela@21:1/5 to All on Sat Jun 25 21:40:57 2022
    How does Qualcomm Quick Charge sense the presence on another compatible
    device.

    Isit looking for voltahe on certain USB pins?

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  • From a a@21:1/5 to Pamela on Sat Jun 25 14:46:57 2022
    On Saturday, 25 June 2022 at 22:41:38 UTC+2, Pamela wrote:
    How does Qualcomm Quick Charge sense the presence on another compatible device.

    Isit looking for voltahe on certain USB pins?
    quick charge devices detect higher charging voltage and accept higher voltage since current is limited by diameter of the wire/s in the charging cable and by internal circuit board.

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  • From Jasen Betts@21:1/5 to Pamela on Sat Jun 25 21:33:23 2022
    On 2022-06-25, Pamela <pamela.private.mailbox@gmail.com> wrote:
    How does Qualcomm Quick Charge sense the presence on another compatible device.

    Isit looking for voltahe on certain USB pins?

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


    --
    Jasen.

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  • From Dave Platt@21:1/5 to pamela.private.mailbox@gmail.com on Sat Jun 25 15:07:33 2022
    In article <XnsAEC1DC911997C37B93@88.198.57.247>,
    Pamela <pamela.private.mailbox@gmail.com> wrote:
    How does Qualcomm Quick Charge sense the presence on another compatible >device.

    Isit looking for voltahe on certain USB pins?

    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.

    --- SoupGate-Win32 v1.05
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  • From Lasse Langwadt Christensen@21:1/5 to All on Sat Jun 25 15:32:08 2022
    s√łndag den 26. juni 2022 kl. 00.07.44 UTC+2 skrev Dave Platt:
    In article <XnsAEC1DC9...@88.198.57.247>,
    Pamela <pamela.priv...@gmail.com> wrote:
    How does Qualcomm Quick Charge sense the presence on another compatible >device.

    Isit looking for voltahe on certain USB pins?
    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.

    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

    --- SoupGate-Win32 v1.05
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  • From Pamela@21:1/5 to Dave Platt on Sun Jun 26 11:57:22 2022
    On 23:07 25 Jun 2022, Dave Platt said:
    In article <XnsAEC1DC911997C37B93@88.198.57.247>,
    Pamela <pamela.private.mailbox@gmail.com> wrote:

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

    Is it looking for voltage on certain USB pins?

    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.

    I found it here. https://www.onsemi.com/pdf/datasheet/ncp4371-d.pdf

    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.

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