Benson here again, continuing my reviews of USB Type-C legacy cables, adapters, and accessories. Today I am reviewing GearIT 3ft Hi-Speed USB 2.0 Type C USB-C to Standard USB Type A Data Sync Cable.
Let's check spec compliance : I'm using my trusty Chromebook Pixel 2015 with the Chromium Twinkie USB-PD Sniffer, available from Plugable.
For my first test, I've got the GearIT cable plugged into an Apple proprietary Type-A charger, 12W version.
The Type-C end is plugged into Twinkie, acting as a pass through to Chromebook Pixel 2015.
Let's run this ec tool command on Pixel : localhost ~ # ectool --dev 1 usbpdpower Port 0: SNK Charger Proprietary 4687mV / 2400mA, max 5000mV / 2400mA / 12000mW Port 1: SRC
So far so good. Pixel identifies the charger as a Proprietary type adapter, and has negotiated 2.4A of charging.
Let's see what Twinkie says : > tw cc CC1 = 421 mV ; CC2 = 24 mV
The tw cc command reads the current voltage values from the CC pins. As you can see here, CC1 pin has a value of 421mV. Referring to the USB Type-C Specification Table 4-25 Voltage on Sink CC pins, this voltage falls right in the middle of the range allowed for vRd-USB, meaning that yes, this cable has the correct 56kΩ pullup resistor!
One more command : > tw vbus VBUS = 4731 mV ; -2450 mA
The tw vbus command uses twinkie's current and voltage meter ability. As you can see, the laptop is pulling just around 2.4A of current at 4.731V from the Apple adapter.
For a data test, I’ve hooked my Nexus 5X to my Chromebook Pixel via the GearIT cable to test large file transfer via MTP. It just works, no problem!
Now for more subjective aspects of this cable. The Type-C plug on this cable is a stamped metal part that's been wrapped around to the shape of the plug. It does have a seam on one side. The plug also has a black plastic tip. This is good, but not as great as other cables that have deep-draw extruded plugs, like Apple or Google ones. What impressed me about this cable, though, is how thin and flexible the PVC material is.
In conclusion : A high quality charging and data sync cable from GearIT. The cable is a great safe way to charge and data sync your new USB Type-C devices such as Nexus 6P/5X or Pixel devices. It is also future proof for fast charging USB Type-C devices to come!