UCD3138: What's the default status of pin 29?

Anders Yang

Prodigy 570 points

Part Number: UCD3138

Hello guys,

When the device was not powered, what's the default status of pin29, high resistance?

over 5 years ago

0 Yitzhak Bolurian over 5 years ago

TI__Mastermind 18370 points

Hi,

I am guessing that you are referring to the 64-pin version of the chip (UCD3138RGC).

I this case, pin #29 will be pulled low if the chip is not powered.

This is due to ESD protection diode becoming forward biased.

Please note that if you want to use a PMBus_Alert pin, the pin #27 is a better candidate and will stay high resistance even if the device is not powered.

Regards,

0 Yitzhak Bolurian over 5 years ago in reply to Yitzhak Bolurian

TI__Mastermind 18370 points

Hi,

If the above addressed your question please set the status of this post to resolved.

Regards,

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UCD3138: What's the default status of pin 29?