ThatrCOs a bit chicken and egg. If the equipment, eg phone, has a discharged battery it canrCOt enter into PD negotiations unless the charger provides it with some power.No. Part of the PD spec is that just placing certain resistors on the
On 22/05/2025 17:05, Tweed wrote:
ThatrCOs a bit chicken and egg. If the equipment, eg phone, has a discharged >> battery it canrCOt enter into PD negotiations unless the charger provides it >> with some power.No. Part of the PD spec is that just placing certain resistors on the
two pins that carry the PD negotiation in the USB-C connector will make
the source output 5V power.
Brian Gregory <void-invalid-dead-dontuse@email.invalid> wrote:
On 22/05/2025 17:05, Tweed wrote:
ThatrCOs a bit chicken and egg. If the equipment, eg phone, has a dischargedNo. Part of the PD spec is that just placing certain resistors on the
battery it canrCOt enter into PD negotiations unless the charger provides it
with some power.
two pins that carry the PD negotiation in the USB-C connector will make the source output 5V power.
My understanding is that those resistors are to allow higher currents at 5V to be requested. Without them 5V at 500mA should be provided, as per the earliest version of USB.
It's very difficult to 'provide' a specific current at a given
voltage, it needs a 'consumer' to take more than 500mA if it's
available. A source can limit the current to a maximum but it can't
really provide more unless the consuming device increases its
consumption.
So the current might be limited to 500mA at 5v **unless** those
resistors are present but it's down to the consuming device to take
more than 500mA if it's available.
In reality I doubt if the resistors change the current availability,
they almost certainly negotiate different voltages.
Scott <newsgroups@gefion.myzen.co.uk> wrote:
Thank for this helpful advice. The charger is said to be genuine Apple
(removed from the boxes of US imports). As an added precaution, I'll
take it into the Apple Store and ask them to check.
I'm not sure they're able to tell you whether a third party product is >genuine or not (they are not skilled in the arts of telling whether the >writing that's supposed to be dark grey is in fact black, and similar sorts >of things used to tell them apart). For one thing they wouldn't want the >liability if they called it the wrong way.
Brian Gregory <void-invalid-dead-dontuse@email.invalid> wrote:
On 22/05/2025 17:05, Tweed wrote:
ThatrCOs a bit chicken and egg. If the equipment, eg phone, has a dischargedNo. Part of the PD spec is that just placing certain resistors on the
battery it canrCOt enter into PD negotiations unless the charger provides it
with some power.
two pins that carry the PD negotiation in the USB-C connector will make
the source output 5V power.
My understanding is that those resistors are to allow higher currents at 5V to be requested. Without them 5V at 500mA should be provided, as per the earliest version of USB.
On 28/05/2025 06:59, Tweed wrote:
Brian Gregory <void-invalid-dead-dontuse@email.invalid> wrote:
On 22/05/2025 17:05, Tweed wrote:
ThatrCOs a bit chicken and egg. If the equipment, eg phone, has a dischargedNo. Part of the PD spec is that just placing certain resistors on the
battery it canrCOt enter into PD negotiations unless the charger provides it
with some power.
two pins that carry the PD negotiation in the USB-C connector will make
the source output 5V power.
My understanding is that those resistors are to allow higher currents at 5V >> to be requested. Without them 5V at 500mA should be provided, as per the
earliest version of USB.
That's not my understanding of how it works, at least in some cases,
with USB-C.
I don't think the pins in question even existed on earlier versions of USB.
Jason H <jason_hindle@yahoo.com> wrote:
I tend to assume that if it's sourced from a responsible retailer, and has >> Anker or Ugreen written on it, then it will be fine.
--
A PICKER OF UNCONSIDERED TRIFLES
The trouble is those brands are only sold via Amazon as far as I know.
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