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本帖最后由 pgain2004 于 2015-11-16 07:50 编辑
https://plus.google.com/u/0/+BensonLeung/posts/EFSespinkwS
主贴:
Don't buy this #USB #TypeC adapter for your Chromebook Pixel or Nexus 6P/5X phone. It uses the wrong identifier resistor.
Oneplus needs to get the message that their accessories are out of spec...
别卖这适配器给你们的Chromebook Pixel或者Nexus 6P/5X用。它用的识别电阻不对。一加得知道他们的外设不符合标准……
那用了会有什么结果?
Benson Leung: Having a weaker than 3A charger is actually a risk factor because the device being charged will always try to charge at 3 and if the older adapter can't handle 3A, that is when it might be damaged.
工程师:设备会识别并一直使用3A快充模式,如果适配器上不了3A,那就可能造成损伤。 Daniel Dorau: How comes that the Nexus 5X charges with 2.2A with a cable with 56k resistor. Shouldn't it load with standard USB current then?
有人问:为毛N5X会在接带56k电阻的线时用2.2A来充?不该是标准USB电流值嘛? Benson Leung: 2.2A is legal assuming your phone and your charger are using some proprietary protocol (for example, Apple's 12W iPad charger protocol to negotiate to 2.4A).
工程师:会切2.2A其实就是当你的设备和充电器有特殊协议啦(例如苹果的12W iPad是2.4A)。 Mark Stronge: What about their usbc cables?
有人问:那一加的USB-C线呢? Benson Leung: OnePlus 2 USB Type-C cable is not spec compliant.
工程师:不符合标准。 Colton Adams: So the OnePlus USB-A to USB-C cords are harmful? I just ordered three of these.
有人问:那所以一加的USB-A到USB-C转接口也不行咯? Benson Leung: the Oneplus A-C cable is not compliant either. I don't recommend anyone with a Nexus use it.
工程师:同样不合标准。我不建议用在Nexus上。 Benson Leung: I read that page, and from what I can interpret (Chinese is not my strong suit), they specifically misread the specification and put the WRONG resistor value (10kΩ). They highlighted the 3A row and pictures further down show a MacBook charging at 2.83A over this cable, which immediately flashes red warnings for me. 2.83A is absolutely a spec violation for USB Type-A.
This chinese vendor specifically misread the spec. They did not read table 4-13 correctly at ALL. They need to put in a 56kΩ resistor.
工程师:看过了,我觉得(我中文一般)他们对标准理解错了,用了错误的阻值。他们还特地高亮3A那行,而后面的图却说用2.83A给MacBook充电,我心底立马亮红灯了——2.83A绝对违背了USB-A标准。尤其是,他们根本没正确解读标准文件里的4-13表格。该上56kΩ电阻才对。
我英文一般,但也说说自己的理解:总的来说,包括一加在内的部分(国内)USB-C外设不符合标准,给支持3A快充的设备用会产生损害。
以及这人在阿玛逊上给很多这种线路类外设写了review。
如果有错翻请不吝指正,以及我不了解技术细节,这是通过reddit安卓版的帖子知道,再去G+看了之后转过来的,对那些人的结论正误不作判断,只是想给在用带USB-C设备的人一个提醒。
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