Benson here again, continuing my reviews of USB Type C legacy cables. Today I am reviewing Ankway's USB Type C to Type A 6ft cable.
Let's talk about spec compliance. My test setup today include a Chromebook Pixel 2015, and a Chromium OS USB-PD Sniffer (codename Twinkie). Please check it out by searching google for "Chromium USB-PD Sniffer". This product is also available on Amazon here : Plugable USB 3.1 Type-C (USB-C) Power Delivery Sniffer
I've attached a picture of my testing setup with my Chromebook Pixel.
Running the ectool command on Pixel: localhost ~ # ectool --name cros_pd usbpdpower Port 0: SNK Charger DCP 4845mV / 2000mA, max 5000mV / 2000mA / 10000mW Port 1: SRC In this case, the Pixel has negotiated up to 2A of charging through the Ankway cable to the Dell charger.
Switching over to the USB PD sniffer, I'll run the "tw cc" command to get a voltage reading on both CC lines: > tw cc CC1 = 15 mV ; CC2 = 431 mV
The important number to look at here is CC2_PD, which indicates a voltage of 431mV. If you refer to the USB Type-C Specification 1.1 Table 4-25. Look at the row labeled vRd-USB, which indicates the legal voltage values to read from the CC pin in order to be categorized as "Default USB Power". The range is Min : 0.25V Max : 0.61V. For this cable, I measured a value of 0.431V right in the middle of this range, indicating that yes, this cable has a 56kΩ resistor and is within spec for CC termination.
One more twinky command : > tw vbus VBUS = 4906 mV ; -2034 mA
The vbus command here uses twinkie's built in current and voltage meter. It's confirmed that Pixel is charging at 2A.
For a USB 2.0 High Speed data test, I’ve hooked my Nexus 5X to my Chromebook Pixel via the Ankway Type-A to Type-C cable to test large file transfer via MTP. It just works, no problem!
For other more subjective judgements of this cable : The Type-C plug on this cable is the stamped variety, meaning it has a seam on one side of the cable. What's really nice about Ankway's offering is that they included a very useful velcro cable tie.
In conclusion, this is a fine cable for your Nexus 6P/5X to use with all of your older USB Type-A chargers, hubs, and PCs. It also works great with Chromebook Pixel 2015 and will work great on USB Type-C spec compliant devices to come!