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How the Xiaomi Mi 6 Phone Takes Advantage of the 27W Softbank SELECTION USB PD Enabled USB Type-C Fast Charging AC Adapter for USB Power Delivery Charging

USB PD
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Mi 6

by Xiaomi

The Softbank SELECTION USB PD Enabled USB Type-C Fast Charging AC Adapter was released as the first USB certified charger from SoftBank Commerce & Service to support USB Power Delivery 2.0 fast charge technology over USB Type-C. What happens if this 27 watts based third party charger is used with the Mi 6 phone by Xiaomi which also supports USB Power Delivery? Let's find out here using the GRL-USB-PD-A1 test analyzer software by Granite River Labs to capture the USB Power Delivery protocol transactions.

The Mi 6 can use not only USB Power Delivery 3.0 but also Qualcomm Quick Charge standards over its USB Type-C connector, which could possibly indicate support for Qualcomm Quick Charge 4+ fast charging technology. When connected to the Softbank charger, on a fully depleted battery, we can see over USB Power Delivery negotiations the Mi 6 is first offered 15 watts (5 volts @ 3 amps), 21 watts (7 volts @ 3 amps), 27 watts (9 volts @ 3 amps), and 27 watts (12 volts @ 2.25 amps) power options by the Softbank charger in a repeated manner.    

As the Mi 6 is turned on from power off state, a hard reset happens which we then see the Softbank SELECTION USB PD Enabled USB Type-C Fast Charging AC Adapter again declares the same power capabilities. The phone goes on to request an initial 15 watts (5 volts @ 3 amps) of charging from the Softbank charger which it then accepts.  

We next observe the Mi 6 decides to charge faster by requesting a higher 21 watts (7 volts @ 3 amps) to also get accepted by the Softbank charger. 

Again the Mi 6 follows up to request the third power option of 27 watts (9 volts @ 3 amps) which the Softbank charger seems to agree.

Finally, the phone can be seen to eventually establish the highest power contract of 27 watts (12 volts @ 2.25 amps) to get the fastest charging with the Softbank charger.

Once the Mi 6 is plugged in from zero charge at power off, it starts pulling current while at around 5 volts. Over initial hard reset as the phone boots up, power delivery protocol negotiation begins where the current pulled spikes up to about 3 amps upon first power request. As subsequent power requests are made, the voltage rises up to around 12 volts while the phone starts pulling steady current to get charged at about 16.8 watts (12 volts @ 1.4 amps). 

Despite not reaching the established 27 watts as observed, the Mi 6 still works with the Softbank SELECTION USB PD Enabled USB Type-C Fast Charging AC Adapter using USB Power Delivery to get similar charging as with its own given 18 watts based Xiaomi 18W QC 3.0 Charger over Qualcomm Quick Charge. The Softbank charger can provide an alternative power source just in case the Xiaomi charger is not available when the phone needs a recharge.

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