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This is a disclosure of potential Conflict of Interest, and update.
I have done a tentative #USB   #TypeC analysis of a pre-production prototype from +Tronsmart. Their engineers sent it to me in an effort to bring their W2PTU charger, which I evaluated previously, towards Type-C Spec 1.2 compliance. I am posting this after having received permission to share this data publicly.

Previous analysis here:

[PDF of Compliance Checklist for Tronsmart Prototype EX-W2PTU]

GOOD NEWS: The prototype now appears to be safe and compliant! (Hooray!)
BAD NEWS: There is significant voltage sag on the Type-C port, meaning the Nexus 6P will charge erratically. 8W normally, 12W if you're lucky. Luckily, they have time to fix this before it goes into production.

First, I reiterate I am a Google Top Contributor Program volunteer. I'm unaffiliated with the USB-IF or other certification agencies. I'm an end user who has opted to check devices are safe and efficient for people to use, educate users, and in turn point manufacturers in the right direction. (tl;dr: the USB-IF doesn't want anyone confusing me with them.  Also, I'm not Google Employee, as much as I'd like to be.)

Tronsmart has been an good example of how manufacturers should behave if they've already found themselves in a sticky situation by not doing their homework. They accepted public criticism, made efforts to work with the reporting parties, and took steps to fix their product and make it safe for the public. This is leagues more than some of the other manufacturers I have contacted have done. So major kudos to Tronsmart for that!

This is the same reason I have a good relationship with +Plugable. They also were open to criticism in an honest manner, and worked with other companies in resolving the underlying problem. That shows a qualitative aspect that doesn't come across in these analyses very well.

Here is said data: I stress these are results from a pre-production prototype. Until I am able to purchase an updated unit from Amazon with my own money, my previous statement about the W2PTU still stands.

I put in a bit more effort than I normally do since this isn't set in stone and they have a chance to fix it. There' a lot more random data in the checklist as a result. But if you're technically savvy, you'll appreciate it.

That's all for this update. I don't want people confusing this as a true analysis. It's just a shoutout and some disclosures.

I'll have another post done soon about USB-PD -- thanks to +Benson Leung and cross-company cooperation by the great folks at Google, I will soon be able to fact-check USB-PD devices and cords similar to what +GTrusted does, but on a benchtop- instead of intercompatibility- level.

I have six eMarked cords (some of which are 5A/100W USB-IF certified) lined up to test. Let's hope those results are promising!

Mario Beric's profile photoEvan McBride's profile photoMatt Spector's profile photoNathan K.'s profile photo
How come these companies such as +Tronsmart​ can't make a quality product on their own, but have to rely on volunteer testers to point out the flaws? Don't they have qualified engineers there? 
+Mario Beric​​​​​​​, it is normal industry practice to send prototypes to developers to get feedback. (MKBHD gets prerelease phones all the time.)

Unfortunately, some manufacturers -- such as Tronsmart -- rushed to get their USB-C products to market so made significant mistakes. You are 100% right that is a black mark on their company. But the fact Tronsmart is trying to fix their fault should be acknowledged. Love the sinner, hate the sin.

There are others who would argue it should be interpreted as them trying to cut corners wherever possible. I'm more forgiving and give the benefit of the doubt IF they make efforts to do so. If you lambast industry partners, nobody will work with you to solve the problem. I acknowledge this position may be unpopular. But it is honest.
Thanks for the analysis! Ordered a W2PTE but I will be returning it because it's an out of spec version. Much appreciated!
+Nathan K. Was there any update if Tronsmart released a compliant version? I didn't see one listed in your spreadsheet.

Thanks again for all the good information!
Thanks for the response, looks like its best to stay away from Tronsmart for the time being. I am curious though, what do you use as your daily USB-C charger?
+Matt Spector My daily charger is a Google 22.5W dual-port (Pixel + Nexus 6P). Prior to that it was an Innergie 45W (since the 6P is fiddly about input voltages). Part of this was Innergie has a 3-year connected device insurance policy too.

And if the Google chargers blew up my phone, since I got the phones and charger from the Google store they'd likely replace them NQA. (This one is more speculation though.)
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