They're focused on a lot of today's newest technology including many many #USB #TypeC that I haven't gotten my hands on yet, but they also focus on interoperability, and making sure that popular products work well with one another.
The people behind GTrusted also have their roots in electrical engineering and test equipment, so they do a deeper dive that other consumer electronics sites would do. You wouldn't see Engadget or The Verge post an USB PD analyzer trace for a charger, but would!
A lot of my readers have pored over the USB PD specification for a long time (especially when the Nexus 5X/6P phones were announced) trying to figure out how power delivery works in the new USB world. However, much of the PD specification was defined before USB Type-C, when PD was meant to operate on Type-A and Type-B and a lot of the early concepts have since been deprecated or changed. One such concept that was confusing was “PD Power Profiles.”
Practically speaking, almost no one implemented “Power Profiles” in exactly the same way the spec defined. It had a 5V 2A requirement that confused people because most Type-C PD adapters were 5V 3A.
Looking at the newest version of the USB PD Spec Revision 2.0, V1.2, the section of “Power Profiles” is blank. “This section is deprecated.” Great! So no one has to ever talk about Power Profiles again!
Instead, the newest versions of USB PD have “Power Rules” (USB PD Section 10) which make a TON more sense, and I am pleased to say there are power sources on the market today that implement these rules. You can see the new rules in the table and graph I’ve attached.
Going forward, the new voltage levels to expect on new chargers are 5V, 9V, 15V, and 20V. The 12V level is now optional.
The new rules also introduce a “superset” guarantee. Larger wattage power sources must support all voltage levels below their maximum up to 3A. As the spec says, “Bigger is always better in user’s eyes – don’t want a degradation in performance. Higher power Sources do everything smaller ones do”
As a result, the consumer only needs to know that their device ships with a x watt power supply, and know that any power supply that is rated at > x watts will be at least as good as the one that shipped with the device. When comparing power supplies, they only need to look at the watt rating to know when a charger is objectively more capable than another. Under no circumstances should a more expensive charger charge your device slower than a cheaper one.
I’m also pleased to note that devices that implement the new USB PD R2.0 power rules are already on the market! 's PowerPort+ USB-C PD has a 45W capable Type-C PD port which supports 5V/3A, 9V/3A, 15V/3A, and 20V/2.25A.Their product is available here : https://www.anker.com/products/A2053111
#USB #TypeC #USBC
Tronsmart has fixed the problem from the 1st generation where the C plug would only be rated at 2.4A but advertised 3A using the CC pullup. They fixed it by upgrading the hardware so that the charger does supply 3A reliably.
Also, they removed Quick Charge functionality on the Type-C port, which violated Section 4.8.2, as my followers know. This reduces the total power output on this charger from 36W to 33W, but it's still a good charger for your Type-C phone plus one other device (which may be QC, as the A port now supports QC3).
Great work Tronsmart! Thanks for following up.
One of my colleagues recently bought a brand new P9000 from . It came with a USB A-to-C cable and he was curious if it was a good cable, so he brought it to me.
My testing shows that this cable violates the #USB #TypeC specification. It uses a 10kΩ resistor where it should have used a 56kΩ resistor as mandated by the USB Type-C Specification.
This cable is potentially dangerous, as when combined with a Type-C device that can fast charge, it may damage Type-A chargers, hubs, or PC USB ports that are not designed for the current draw from new USB Type-C devices.
Please see my FAQ for more info :
, please immediately stop bundling these cables, and let your customers know to be very careful with the A-to-C cable that ships with this device.
By the way, this all may be very familiar to other users, because another phone manufacturer from China, , shipped a bad cable with their phone last year as well.
Nice work, Lee.
By the way, nonda actually did send me the same cable, and I did test it : It's a good cable, with the correct 56k Rp, and in spec IR drop. Type-C plug is deep-draw extruded. The only downside is the Type-A plug is a right-angle, which may block ports depending on your laptop/desktop/hub/charger Type-A layout.
#USB #TypeC #USBC
Recall that the USB Type-C spec has restrictions on proprietary charging methods that change voltage over the Type-C connector. https://plus.google.com/+BensonLeung/posts/cEvVQLXhyRX
I've said in the past that some phones' manufacturers violating of this part of the spec makes me wary of products and that I can't give any recommendation regarding these kinds of devices.
I don't review phones, but does, and they've done several mini investigations into the LG G5. It turns out that the G5 also implements USB Power Delivery as well as Qualcomm QC 3.0, and GTrusted has the analyzer traces to prove it.
This is an extremely pleasant surprise for me. This also means that the G5 may support Alternate Modes like VESA DisplayPort out of the box. GTrusted mentions that LG claims to supports it, but thus far they haven't done any testing to show it working yet.
It also means that the PD 2.0 charger that comes with my new Chromebook may work well with the G5 as well.
Another possibility is that charge-through hubs that would not work well with last years' Nexus phones (hubs that charge the phone, but allow the phone to expose USB-A ports) would work with the G5 as well. GTrusted, that would be another great thing to test!
Again, there's still a lot of unknown regarding the phone, so don't take this as a recommendation from me.
Thanks +GTrusted for doing this investigation! Keep up the good work, and hopefully you can help the public answer more questions about this phone.
If the LG G5 supports modifying Vbus beyond 5V by using QC, it violates Section 4.8.2.
tl;dr : VERY bad adapter. Completely ignores the spec. Don't buy this.
Some people have asked me why there are no such thing as Type-C Female to Type-A plug adapters. I explained why not in a post in my Type-C Explained Collection here : https://plus.google.com/+BensonLeung/posts/UFCHbSDRa2o
This company went ahead and made one anyway. It gets a score I've rarely given in my other reviews : 1 star
This adapter is all but identical to the Mobkit one I reviewed a coulpe months back. Same result. Don't buy it.
- Software Engineer, 2010 - presentLinux kernel developer on the Chrome OS team.
- Marvell Technology GroupSoftware Engineer, 2006 - 2010
- Intel CorporationSoftware Engineer, 2005 - 2006
Arms Technica and the tale of the Nonda Zus Kevlar cable
It’s probably a strong cable, but it failed to survive a live-fire exercise.
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