TUSB1042I: Can TUSB1042I be used for TypeC in UFP configuration?

Atsushi Murase

Part Number: TUSB1042I
Other Parts Discussed in Thread: TUSB321AI

Hello,

According to the Pin Configuration/Function table on page3 of the datasheet (SLLSF15D), it seems as if the TypeC connections (Tx1/Rx1/Tx2/Rx2) are only used for Downstream Facing Port mode.

The front page "Simplified Schematics" diagram also shows the TUSB1042I connected to a USB Host (DFP).

However, I'd like to be able to use this chip in a UFP mode, where I connect TypeC (4 channel) upstream to a Host and TypeA (2 channel) downstream to a Hub.

Is this possible?

It seems like you have this exact configuration depicted in the Figure 22/Figure 23 example, showing this chip used in both UFP/DFP modes, on either side of the TypeC cable connections.

Are there any special settings or limitations in using this chip to function in UFP mode?

Thanks for any pointers.

Regards,

-- Atsushi

over 6 years ago

0 JMMN over 6 years ago

TI__Guru 60870 points

Hello Atsushi,

TUSB1042 can be used in an UFP or DFP port. Please note that a separate PD controller / CC controller is required with this device.

Regards,

JMMN

0 Atsushi Murase over 6 years ago in reply to JMMN

Prodigy 20 points

Hello JMMN,

Thank you for your response, it gives me confidence to move forward with your part in our design.

Also, understood with the separate PD/CC controller; I intend to use the TUSB321AI device for the CC function, and we are not using the port in PD mode.

Just curious if you intend to clarify this directional-agnostic issue in a future documentation/datasheet release?

Thanks again,

-- Atsushi

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TUSB1042I: Can TUSB1042I be used for TypeC in UFP configuration?