Well, from what I have seen phones go in every direction but USB C PD. Like, Huawei released a 10V 4A (WTF?) charger last fall — I guess 12V 3A USB C PD wasn’t good enough? There’s all that crap Oppo pulls off… And did Samsung stop their bullshit USB A QC - over USB C charger as they did with the Galaxy Book 12? That was some major standard breaking sorcery I am telling you.
Laptops, yeah, those have standardized on USB C PD very quickly.
You need a “good” cable, but most cables can do it. The thing is, 2.1A is the peak, and phones might only use it for initial charging (<50%). I think I’ve only seen the X series go above 2A. My 7+ maxes out at about 1.8A.
I’m ready to graduate from the more typical cheap, hard-to-read USB meter I have and onto something better, like an RD UM25 or UM34. Now trying to decide between the two.
I may be missing something, but on balance, I can’t discern why the UM34 would be favorable over the UM25, given the small price difference.
Am I missing something? Are there testing scenarios that escape my mind for which the UM34 is suitable but the UM25 is not?
According to RD’s own comparison table, they both do, and the UM25 supports Huawei’s fast charge protocols in addition.
That would be a minor consideration anyway, since I don’t envision a device that utilizes yet another proprietary fast charging standard in my future. I’m fine with USB PD and hope that’s where it will be centered. QC has enough critical mass to continue, and QC4 will have PD compatibility, which will help.
On paper, the 25 is superior in almost every regard, except that it has a USB 2 and not USB 3 port, but I’m not sure how relevant that is when these meters are only taking power measurements.
The sales material associated with the early reviews of the UM25 did not indicate that support like the current table does, so I guess it was added to the UM25 in an update at some point.
Do you have the C version? I figure it’s better to have it, than regret not getting it, but the mention of ads in the smartphone app would be a bummer.
It seems like the data lines are not receiving any signal. It shows 0V - & + and default 1.5A DCP. The YZX meter detects the load and is forcing the charger to put out a different charging protocol and it starts to charge. There is voltage reading at the end of the cable so I guess the issue is at the phone’s side.
It could be many reasons this happens and without knowing which phone, charger and cable you’re using there’s no way to troubleshoot. Have you tried to manually trigger PD or QC 5V? In theory that should work.
Most UT25 has been removed from Aliexpress, we should support originals instead of copies , otherwise it will cause loss to the original creator and they may never create new products
That bare board has great specs, but I find it hard to believe it would be able to handle 60W of output at lower range of input voltage for long times, say 12V which is 5A+ constant input, chargers usually get quite hot at that rate.