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Mi 9

by Xiaomi

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The Xiaomi Mi 9 Phone Still Ships with a Qualcomm Quick Charge 3.0 Charger Even When Supporting Qualcomm Quick Charge 4+

Most recent flagship phones like the Huawei Mate20 Pro and the Samsung Galaxy S10 5G have been pushing for faster charging and the same goes for the Xiaomi Mi 9. The Mi 9 still supports Qualcomm Quick Charge 4+ (QC4+) technology like the Xiaomi Mi 8 but is now shipped with a 27W based charger instead of the Xiaomi 18W QC 3.0 Charger that came with the Mi 8. But don't expect a QC4+ charger with the Mi 9, rather Xiaomi only keeps to a Qualcomm Quick Charge 3.0 charger for the phone. Meanwhile the Mi 9 now supports wireless charging up to 20W which is faster than 15W wireless charging by the Huawei Mate20 Pro and the standard 10W on most Qi enabled phones.

With Qualcomm Quick Charge 4+, the Mi 9 can charge its battery quickly using USB Power Delivery 3.0, PPS (Programmable Power Supply), and Qualcomm Quick Charge 3.0 technology over USB Type-C. Compared to the Mi 8, the Mi 9 has a newer and faster Qualcomm Snapdragon 855 chipset, Adreno 640 GPU and Android 9.0 OS.

Here's a closer look at the Mi 9 after we purchased the phone.

Except for the Xiaomi 27W QC3 charger, the Mi 9 comes with similar accessories as the Mi 8 which consists of a USB Type-A to Type-C cable, SIM eject tool, clear soft case, documentation and a USB Type-C to 3.5 mm audio adapter for connecting to your traditional audio headphones from the phone's USB Type-C port.

The Mi 9 still uses a USB Type-A based Qualcomm Quick Charge 3.0 enabled charger despite the phone supporting Qualcomm Quick Charge 4+. The Xiaomi charger supports power profiles of 15 watts (5 volts @ 3 amps), 27 watts (9 volts @ 3 amps), 27 watts (12 volts @ 2.25 amps) and 27 watts (20 volts @ 1.35 amps) for charging out.

Instead of only two rear cameras on the Mi 8, the Mi 9 has three cameras on its back with 48 MP (wide), 16 MP (ultrawide) and 12 MP (telephoto) and HDR, AI, and 4K video capture capabilities.

Xiaomi has chosen to follow Samsung's and Huawei's directions for the Mi 9 by having the fingerprint sensor under the display rather than on the back of the phone.

Starting up the Mi 9, the Welcome screen comes on and in the next few screens you need to select the language of your choice, connect to Wi-Fi, accept terms and conditions and insert a available SIM card. You can also choose to turn on data syncing on the Mi Cloud based network. 

   

  

If you have an existing Mi account, you can choose to log in or simply create a new Mi account or skip it. The next screen will ask to add your fingerprint and set up voice command. It also allows you for additional settings such as location and auto updates.

   

  

You can then select the theme of your choice before finally going to the Home screen so you can start using the phone.

  

In the following test reports, we can see how the Mi 9 supports power which we tested using the USB Power Test App from Granite River Labs with the Granite River Labs USB Power Delivery Compliance C2 Tester.

The USB Power Test App first negotiates a power contract emulating the Source to determine the Power Delivery Sink capabilities of the Mi 9. The USB Power Test App then reports out the voltage and current supported by the phone for each of the Source PDO's advertised to the phone.

Sink Cap.Voltage (V)Current (A)
5V5.112.9
6V6.062.82
7V7.022.79
8V8.072.78
9V9.071.81
10V5.122.89
11V5.082.9
12V5.132.9
13V5.072.9
14V5.12.89
15V5.142.9
16V5.132.89
17V5.092.9
18V5.062.9
19V5.12.89
20V5.132.89

The USB Power Test App from Granite River Labs also produces a voltage, current trace plot which graphically shows the voltage and current requested by the phone for each advertised Source PDO throughout the power negotiation.

Using the USB Power Delivery Compliance C2 Tester from Granite River Labs to run just a subset of the full USB Power Delivery compliance test suite, we can see that the Mi 9 supports charging using 15 watts (5 volts @ 3 amps), 27 watts (9 volts @ 3 amps) and 27 watts (12 volts @ 2.25 amps) fixed PDO's. Unfortunately many compliance failures were also observed so just be careful when using this phone.

Power Capabilities

Parameter

GetCapabilities

PD_POWER_AS_SINK

27000

NUM_SNK_PDOS

3

Supply Type #1

Fixed

Voltage #1

0x64(5V)

OP Current #1

0x12C(3A)

Supply Type #2

Fixed

Voltage #2

0xB4(9V)

OP Current #2

0x12C(3A)

Supply Type #3

Fixed

Voltage #3

0xF0(12V)

OP Current #3

0xE1(2.25A)

USB-IF High Level Mapping Summary

Sl No

Test Category

Test Group Description

Test Result

1

PHY_PRIMARY_TX

BMC Physical Layer Transmitter

PASS

2

PHY_PRIMARY_RX

BMC Physical Layer Receiver

FAIL

3

PHY_PRIMARY_MISC

BMC Physical Layer Miscellaneous

FAIL

4

PROT_PRIMARY

Protocol Specific Primary

FAIL

5

POWER_PRIMARY

Power Source/Sink Primary

FAIL

Result Summary

Sl No

Test ID

Test Name

Test Result

1

TDA.2.1.1.1

TDA.2.1.1.1 BMC PHY TX EYE

PASS

2

TDA.2.1.1.2

TDA.2.1.1.2 BMC PHY TX BIT

PASS

3

TDA.2.1.2.2

TDA.2.1.2.2 BMC PHY RX INT REJ

FAIL

4

TDA.2.1.2.1

TDA.2.1.2.1 BMC PHY RX BUSIDL

FAIL

5

TDA.2.1.3.1

TDA.2.1.3.1 BMC PHY TERM

FAIL

6

TDA.2.1.3.2

TDA.2.1.3.2 BMC PHY MSG

FAIL

7

TDA.2.2.1

TDA.2.2.1 BMC PROT SEQ GETCAPS

FAIL

8

TDA.2.2.2.1

TDA.2.2.2.1 BMC PROT SEQ CHKCAP P PC

FAIL

9

TDA.2.2.2.2

TDA.2.2.2.2 BMC PROT SEQ CHKCAP NOMARK P PC

FAIL

10

TDA.2.2.2.3

TDA.2.2.2.3 BMC PROT SEQ CHKCAP CP ACC

FAIL

11

TDA.2.2.2.4

TDA.2.2.2.4 BMC PROT SEQ CHKCAP NOMRK CP ACC

PASS

16

TDA.2.2.7

TDA.2.2.7 BMC PROT BIST NOT 5V SRC

FAIL

18

TDA.2.2.9

TDA.2.2.9 BMC PROT GSC REC

FAIL

19

TDA.2.2.10

TDA.2.2.10 BMC PROT IGN PPS

PASS

21

TDA.2.3.1.2

TDA.2.3.1.2 POW SRC LOAD CP ACC

FAIL

22

TDA.2.3.2.1

TDA.2.3.2.1 POW SRC TRANS P PC

FAIL

24

TDA.2.3.3.1

TDA.2.3.3.1 POW SNK TRANS C CP

FAIL

25

TDA.2.3.3.2

TDA.2.3.3.2 POW SNK TRANS PC

FAIL

BMC Eye Diagram


Eye Diagram 

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