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The Meizu Pro 7 Plus Phone Can't Charge Quickly with the Google Universal Type-C Charger 60W via USB Power Delivery

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The Google Universal Type-C Charger 60W is one of the first products in the market supporting USB Power Delivery over USB Type-C. However when used with the USB Power Delivery enabled Meizu Pro 7 Plus, the phone doesn't charge as fast as it should with this Google charger.

Using the GRL-USB-PD-A1 app by Granite River Labs, we are able to study the USB Power Delivery interaction between the Google Universal Type-C Charger 60W and the Meizu Pro 7 Plus once they are connected together over USB Type-C. The Google charger is initially seen to consistently promote 15 watts (5 volts @ 3 amps), 36 watts (12 volts @ 3 amps), and 60 watts (20 volts @ 3 amps) power profiles over USB Power Delivery when the Meizu phone is on 1% battery charge.

The Meizu Pro 7 Plus responds after a while to first request 7.5 watts (5 volts @ 1.5 amps) from the charger and gets accepted.

We then also observe both charger and phone exchanging Sink Capabilities, Data Role Swap, and VCONN_Swap among others in between negotiation.

From the power graph, we manage to observe the Google Universal Type-C Charger 60W delivers only about 6.1 watts (5.1 volts @ 1.2 amps) to the  Meizu Pro 7 Plus from 1% battery when the phone is on. There's also a brief period during initial plugin where the current suddenly drops to near zero just before the phone initiates VCONN_Swap with the charger. After which the current then only starts to step up to around 1.2 amps with the voltage at 5.1 volts.

With the Meizu Pro 7 Plus only getting around 6W charging from the Google 18W USB-C Power Adapter over USB Power Delivery, the  phone  can't charge as quickly as using its own mCharge 4.0 technology as seen in this review

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