Customer Review

January 27, 2016
Benson here again, continuing my reviews of USB Type-C legacy cables, adapters, and accessories. Today I am reviewing Otium's USB Type C to Micro USB Adapter, Otium USB Type C to Micro USB Adapter. This adapter is a MicroUSB female to Type-C plug adapter, putting it in the class of devices known as "Legacy Host Adapters." This product comes in a convenient 2 pack.

Let's check spec compliance :
I'm using my trusty Chromebook Pixel 2015 with the Chromium Twinkie USB-PD Sniffer, available on Amazon from Plugable : Plugable USB 3.1 Type-C (USB-C) Power Delivery Sniffer

For my first test, I've got the Otium MicroUSB Adapter plugged into a good quality (itself capable of >2.4A) Micro-B cable from Belkin. (this one: Belkin 6-Foot 2.0 USB Type C (USB-C) to Micro USB Charge Cable, USB-C Certified) That is then plugged Apple proprietary (MacBook) charger capable of 5.2V at 2.4A.

The Type-C end is plugged into Twinkie, acting as a pass through to Chromebook Pixel 2015. Picture attached!

First let's run the ectool command from Pixel's command line to check what Pixel thinks is happening on its USB-C ports :
localhost ~ # ectool --dev 1 usbpdpower
Port 0: SNK Charger Proprietary 4612mV / 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.

Let's see what Twinkie (the USB PD sniffer) says :
> tw cc
CC1 = 18 mV ; CC2 = 421 mV

The tw cc command reads the current voltage values from the CC pins. As you can see here, CC2 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 MicroUSB adapter has the correct 56k' pullup resistor!

One more Twinkie command :
> tw vbus
VBUS = 4750 mV ; -2440 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 4.750V from the Apple charger over the Belkin cable + Otium adapter.

For a HighSpeed USB 2.0 data test, I’ve hooked my Nexus 5X to my Chromebook Pixel via the Otium MicroUSB adapter + Belkin cable to test large file transfer via MTP. It just works, no problem!

Now for more subjective judgments of this adapter : The Type-C plug on this adapter is a stamped metal part that's been wrapped around to the shape of the plug. It does have a seam on one side. This is good, but not great like the stronger deep-draw plugs from other manufacturers including the Google and Apple 1st party plugs. What definitely makes the Otium adapter stand apart from other adapters like it though is the shell, which is anodized aluminum and a step above the plastic shells of similar adapters. It feels durable and fits in with the all aluminum bodies of Pixel devices, Nexus 6P, and MacBooks.

In conclusion : A high quality charging and data sync MicroUSB Adapter from Otium! The adapter is a great safe way to breathe new life into your old A-to-MicroUSB cables for use with newer 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!
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Product Details

4.1 out of 5 stars