TPS544B25: The termination of unused SMBus pins

Hirotaka Matsumoto

Part Number: TPS544B25

Hi all

Would you mind if we ask TPS544B25?
What is the better way for the termination of SMBus pins which is not used?
-Pull up with 4.7khom
-Pull down with 4.7kohm

We assume that pull up with 4.7khom is better because of 100kHz.

Kind regards,

Hirotaka Matsumoto

over 5 years ago

0 JohnTucker over 5 years ago

TI__Guru**** 191445 points

Matsumoto-san,
If you don’t use PMBus, you can float the clock, data and alert# pins.

0 Hirotaka Matsumoto over 5 years ago in reply to JohnTucker

Guru 27525 points

John san

Thank you for your reply.

OK, we got it.
Just in case, does it have any internal pull-up at clock and data pins?

Kind regards,

Hirotaka Matsumoto

0 JohnTucker over 5 years ago in reply to Hirotaka Matsumoto

TI__Guru**** 191445 points

Matsumoto-san,

Please contact me directly.

0 Mathew Jacob1 over 5 years ago in reply to Hirotaka Matsumoto

TI__Expert 5900 points

Matsumoto-san,
CLK and DATA have no internal pull-ups and can be connected to GND at the thermal pad if not used.

CNTL is the Enable for the converter, it should be connected to BP3 if not used.

Regards,
Mathew

Power management

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TPS544B25: The termination of unused SMBus pins