Look, I'm an idiot. I know that, you know that, and the man on the moon knows that. Let's not get into why I'm an idiot; let's just accept that I have my peculiarities and you have yours. My idiocy is a quest to make sure all my portable electronics can recharge using USB-C. Modern smartwatches are tiny and they do a lot. As a consequence, their battery life is generally poor. The industry's…
Loved the article.
One pet peeve of mine: PD plugs are too powerful to charge puny devices. Not the first time I’ve run into this problem.
So sad that we’ve finally gotten a good standard (USB c) but there are still things that look like they should fit together and work, but don’t.
The thing is that USB type C is only about the physical plug/socket, and the USB standard and version that uses it is a separate thing.
In this case it’s probably a PD only charger and the device only supports plain old 5v 500mA USB power
too powerful? what do you mean? USB PD by default supplies 5v the same as USB A and increments from there
5v is pretty low - 3v is pretty common logic voltage, but i doubt anyone would use voltage that low for battery charging?
do you mean you don’t like to “waste” a perfectly good powerful USB C port? you can get some pretty low watt USB C plugs, but honestly i much prefer to just have a brick with 7 big ports
The person you replied to is referencing findings made by the author, in the article.
The author tried plugging a PD charger into the watch to charge it, and it wouldn’t work. It’s probably not PD as a specification couldn’t work, but that the watch failed to negotiate with the charger.
Whatever the reason, the findings were that plugging your PD laptop charger into this cheap little watch does not result in any charging.
right… i think that’s less of a problem with PD chargers and more of a problem with non-compliant A chargers (and the device itself being non-compliant): wattage/amperage at these has nothing to do with the protocol (other than auto shutoff under a given current draw, but that’s not instantaneous)
i believe that the USB spec says there needs to be a resistor bridging one of the pins to receive power? i can see USB-A chargers just dumping 5v through the cable no matter what and USB-PD more reliably implementing the spec because it’s more complex, so less reason to cut corners
The actual problem is that many brick chargers assume that a low current means charging is finished so it cuts the power, this is extra common with battery packs.
You want USB PD PPS for a charger which is much more likely to actually understand that the device wants and should get the specific amount of power it’s asking for, either low or high.
Does the PD standard not regulate? I’ve used a PD power cord from a laptop to charge a mobile phone, but that isn’t exactly a small device. And maybe I shouldn’t have done that…
I think a phone is big enough that it can work with the PD charger. But I had a tiny little gadget that wouldn’t pull any power from a PD charger, but did charge from a normal charger / dollar store cable.
You can certainly charge a phone with a PD laptop charger. PD does negotiate, so it will only give the device what the device indicates it can support.
I use my laptop charger with my android phone frequently if I’m out and about.