MPQ4242 Charging data port

DC-DC Power Converters
1

Hello,

We developed a charging electronic for a tablet with the MPQ4242. Our intentional usecase would be, that the developed device is a USB data sink and a power source.
The charging is working fine up to 60W as expected.
We left the USB lines free since it is necessary for the charged tablet to also communicate via USB 2.0 to the device. When I connect the tablet via a USB 2.0 Type-A to Type-C cable, the USB connection works as intended.
Therefore, we assume that via the CC lines, the MPQ4242 is only recognized as a power brick. We also wrote to the “HOST_SET” register at 0x02 so that it should behave as a PDUSB hub, but still, only charging is possible when connected via USB-C.
Additionally we modified register 0x16 and enabled CDP. This also didn’t solved the issue. I also connected the USB lines for testing, but still no succsess.

Is it possible to use the MPQ4242 to communicate via USB 2.0 and charge with USB-PD in parallel? How can this be done?

Best regards,

1 Like
2

Hi @m.schmied,

A quick clarification, when you mentioned you have left the USB lines free, do you mean free as floating? are you referring to DP/DM pins? Can you share your schematic?

I believe you require the DP/DM pins for Type A.
What is your power requirement? Can you verify if the respective PDOs are turned ON in register (0x00) and set the current and voltage limits in their specific register map.

Kindly let us know if you have further questions.
Best,
Saurabh

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3

Did this question get answered? We have same situation @m.schmied described, and have already tried the same things (glad we’re not alone in thought process!).
I’ll add that USB 2 data lines to PC will not operate properly when connected to our host IC and also the MPQ4242. I have also verified that adding 5.1kohm resistors to ground to DP/DM lines will make our device appear to the PC, but then charging stops working.