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Google Pixel XL

by Google Inc.

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The Google Pixel XL Phone Has Many Compliance Issues Despite Supporting USB Power Delivery Charging

The Google Pixel XL debuted alongside the Google Pixel in late 2016 as the original Pixel branded flagship phones sold by Google. The Android based Google Pixel XL Phone supports standard USB Power Delivery 2.0 fast charging over USB Type-C similar to the Google Pixel Phone. The Pixel XL ships with a Google 18W charger supporting USB Power Delivery to keep itself charged.

Using the USB Power Test App from Granite River Labs with the Granite River Labs USB Power Delivery Compliance C2 Tester, we can verify the power capabilities of the Google Pixel XL by running the following tests.

The USB Power Test App first negotiates a power contract emulating the Source to determine the Power Delivery Sink capabilities of the Pixel XL. 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)
5V5.121.9
6V5.121.88
7V5.111.9
8V5.121.88
9V9.121.85
10V5.111.84
11V5.111.82
12V5.111.81
13V5.121.81
14V5.121.82
15V5.111.83
16V5.111.8
17V5.11.78
18V5.111.83
19V5.121.82
20V5.111.82

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 Pixel XL for each advertised Source PDO throughout the power negotiation.

Port2 Plot

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 for the Pixel XL, unfortunately we found a lot of problems with the phone as seen through the compliance failures below. Note the Pixel XL was also observed to support charging using the following fixed PDO's- 4.5 watts (5 volts @ .9 amps), 15 watts (5 volts @ 3 amps) and 18 watts (9 volts @ 2 amps) as well as battery operating power of 18 watts @4-10 volts.

Power Capabilities

Parameter

GetCapabilities

PD_POWER_AS_SOURCE

4000

NUM_SRC_PDOS

1

Supply Type #1

Fixed

Peak Current #1

0x0(A)

Voltage #1

0x64(5V)

Max Current #1

0x5A(.9A)

PD_POWER_AS_SINK

 

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

0xC8(2A)

Supply Type #3

Battery

Min Voltage #3

0x50(4V)

Max Voltage #3

0xC8(10V)

Op Power #3

0x48(18W)

USB-IF High Level Mapping Summary

Sl No

Test Category

Test Group Description

Test Result

1

PHY_PRIMARY_TX

BMC Physical Layer Transmitter

FAIL

2

PHY_PRIMARY_RX

BMC Physical Layer Receiver

FAIL

3

PHY_PRIMARY_MISC

BMC Phyiscal Layer Miscellaneous

FAIL

4

PROT_PRIMARY

Protocol Specific Primary

FAIL

Result Summary

Sl No

Test ID

Test Name

Test Result

2

TDA.2.1.1.2

TDA.2.1.1.2 BMC PHY TX BIT

FAIL

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

12

TDA.2.2.7

TDA.2.2.7 BMC PROT BIST NOT 5V SRC

FAIL

14

TDA.2.2.9

TDA.2.2.9 BMC PROT GSC REC

FAIL

15

TDA.2.2.10

TDA.2.2.10 BMC PROT IGN PPS

FAIL

17

TDA.2.3.1.2

TDA.2.3.1.2 POW SRC LOAD CP ACC

FAIL

18

TDA.2.3.2.1

TDA.2.3.2.1 POW SRC TRANS P PC

FAIL

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