TPS549B22: About PMBus command

tsuyoshi tokumoto

Part Number: TPS549B22

Hello team,

I want to turn the device output off before issuing STORE_DEFAULT_ALL command.

I understand that under the conditions that the VDD voltage exceeds Vvdd_UVLO,
even if the EN_UVLO pin voltage is Low(GND), the register will be able to be accessed via PMBus.

Is my understanding correct?

Sincerely,
Tsuyoshi Tokumoto

over 7 years ago

0 Newey Yakamna over 7 years ago

TI__Intellectual 1520 points

Hi Tsuyoshi-san,

Your understanding is correct. As long as the internal LDO (VREG) is high, the device is active even though it's not switching. You can issue the STORE_DEFAULT_ALL command after you turn the device output off via EN pin but keep VDD high.

Thank you.

Amnat

0 tsuyoshi tokumoto over 7 years ago in reply to Newey Yakamna

Expert 2630 points

Hi Amnat-san,

I appreciate your continuous prompt correspondence.
Your answer is very helpful for me!

Thank you and best regards,
Tsuyoshi Tokumoto

0 Newey Yakamna over 7 years ago in reply to tsuyoshi tokumoto

TI__Intellectual 1520 points

Hi Tsuyoshi-san,

You're welcome!

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TPS549B22: About PMBus command