TUSB321: Rp pullup resistors for CC1, CC2 pins

Chuck St John

Prodigy 60 points

Part Number: TUSB321

Does this IC include the Rp pullup resistors for CC1 and CC2 pins or should they be added to my PCB?

over 5 years ago

0 Malik Barton57 over 5 years ago

TI__Guru 64326 points

Hi Chuck,

Yes this device has internal Rp.

0 Chuck St John over 5 years ago in reply to Malik Barton57

Prodigy 60 points

Hi Malik- Thanks. Follow-up question though. In the Universal Serial Bus Type-c Cable and Connector Specification Rev 1.3, section 4.11.1 Termination Parameters, Table 4-20 gives basically 6 different CC pullup R values depending on the combination of advertised source current and the pull-up voltage. Are you saying that the IC is designed to present the "correct" Rp based on what these two values are?

tnx

Chuck

0 Chuck St John over 5 years ago in reply to Malik Barton57

Prodigy 60 points

See follow up Q....

0 Malik Barton57 over 5 years ago in reply to Chuck St John

TI__Guru 64326 points

Hi Chuck,

My apologies let me clarify my previous post. TUSB321 has a internal Rp current source that is used to report specific states on the CC line. For reference, you can see this illustrated in the functional block diagram in section 7.2 Functional Block Diagram. The correct current is sourced onto the CC line based on TUSB321 settings. Also there are only three Rp resistances based on the given internal pull-up voltage, this value is typically separate from Vcc.

Interface

Interface forum

TUSB321: Rp pullup resistors for CC1, CC2 pins