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How the Meizu Pro 7 Plus Phone Gets Powered by the Apple 29W USB-C Power Adapter Through USB Power Delivery

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Besides supporting Meizu's owned mCharge 4.0 fast charging technology, the Meizu Pro 7 Plus phone also uses USB Power Delivery to enable rapid charging with many different USB Power Delivery based chargers including the Apple 29W USB-C Power Adapter that was shipped together with the  Apple MacBook (Early 2015).

After connecting the Meizu Pro 7 Plus directly to the Apple 29W USB-C Power Adapter over USB Type-C, we can see from the Granite River Labs  GRL-USB-PD-A1 app that the Apple charger repeatedly offers 12 watts (5 volts @ 2.4 amps) and 29.6 watts (14.8 volts @ 2 amps) over USB Power Delivery to the 1% charged phone.

The Meizu Pro 7 Plus responds after a while to request an initial 7.5 watts (5 volts @ 1.5 amps) which the Apple 29W USB-C Power Adapter then accepts. During negotiation, we also observe both the charger and phone communicate over Discover Identity’s and SVIDs’.

As 7.5 watts is initially requested and Vendor Defined Messages are exchanged, the Meizu Pro 7 Plus actually begins pulling around 1.4 amps @ 4.9 volts while turned on at 1% battery upon plugin. The current pulled then drops slightly to about 1.3 amps for the phone to eventually draw around 6.37 watts (4.9 volts @ 1.3 amps) of charging power.   

The Meizu Pro 7 Plus appears to be charging fine with the Apple 29W USB-C Power Adapter but not as quickly as being charged using the Meizu's supplied charger and USB Type-A to Type-C cable accessory in this review.

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