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How the Apple 15" MacBook Pro (2018) Gets Charged Using the HooToo HT-UC007 USB-C Network Adapter and Apple 87W USB-C Power Adapter

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The HooToo HT-UC007 USB-C Network Adapter allows you to expand your Mac's connectivity with HDMI video, Ethernet networking, external USB drives and charging options. You can also plug in your Mac's AC adapter to the HooToo HT-UC007 USB-C Network Adapter for charging.  

To see how the HooToo HT-UC007 USB-C Network Adapter supplies power to the Apple 15" MacBook Pro (2018), we connected the HooToo's affixed USB-C cable connector (upstream) to the Mac and charging in USB-C port (downstream) to the Apple 87W USB-C Power Adapter for AC power. Note the Apple 87W USB-C Power Adapter came with the Mac itself along with the Apple USB-C Charge Cable (2m) which was used to plug in to the Hootoo hub.

Upon plugin with the HooToo HT-UC007 USB-C Network Adapter, the Apple 15" MacBook Pro (2018) was initially observed through USB Power Delivery to charge up to about 80 watts (20 volts @ 4 amps) with the Hootoo hub. Since current was rapidly changing along a 20 volts rail, the Mac actually pulled current of 0.5 amps @10 watts to 4 amps @80 watts during charging. Click here to download the trace captured by the GRL-A1 power analyzer for more details.

By observing how the HooToo HT-UC007 USB-C Network Adapter drew power from the Apple 87W USB-C Power Adapter over USB Power Delivery, we could see initially the voltage started up on a 5 volts rail upon plugin but no current was pulled. (In contrast the Mac when connected to the Hootoo hub immediately pulled around 4 amps @ 20 volts to initiate charging at 80 watts.) It took around 10 seconds for the voltage to reach up to 20 volts rail where the Hootoo hub then only began pulling quick changing current to charge with the Apple charger. The Hootoo hub was seen pulling between 0.5 amps @10 watts and 4 amps @80 watts from the Apple charger which was also similar power pulled by the Mac from the Hootoo hub (download the GRL-A1 trace here to see more details).  

From the USB Power Delivery negotiations between the HooToo HT-UC007 USB-C Network Adapter and the Apple 15" MacBook Pro (2018), we further observed the HooToo hub advertising the following Power Data Objects (PDO's)- 7 watts (5 volts @ 1.4 amps), 7.5 watts (5 volts @ 1.5 amps), 15 watts (5 volts @ 3 amps), 22 watts (9 volts @ 2.44 amps) and 81 watts (20 volts @ 4.05 amps) to the Mac. When compared to what the Apple 87W USB-C Power Adapter advertised to the HooToo HT-UC007 USB-C Network Adapter through the following PDO's- 12 watts (5 volts @ 2.4 amps), 27 watts (9 volts @ 3 amps) and 86 watts (20 volts @ 4.3 amps), it shows the lower current advertised by the HooToo hub takes into account the power consumption of the adapter and any downstream devices connected to the adapter.

In fact 80W charging by the HooToo HT-UC007 USB-C Network Adapter also comes close to 88W charging that was observed using the Apple 87W USB-C Power Adapter to directly charge the Apple 15" MacBook Pro (2018) in this review, which shows that the hub is able to deliver near full charging to the Mac.  

Comparatively charging won't be as fast using the Apple USB-C Digital AV Multiport Adapter as seen here.  

Download the A1 software from Granite River Labs to view the trace.

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