TMP431: the THERM_N has a drop when V+ start up

Frank Xiao

Genius 12055 points

Part Number: TMP431

hi team,

My customer has found the THERM_N has a drop when V+ start up, I also attached the schematic, could you please help check it? Thanks.

over 4 years ago

0 David Vaseliou over 4 years ago

TI__Expert 6820 points

Hi Frank,

The schematic looks ok. Can you send oscilloscope waveform with both the Vcc and the Therm pin.

Thanks,

0 Frank Xiao over 4 years ago in reply to David Vaseliou

TI__Genius 12055 points

Hi David,

See the attached waveform. Thanks.

0 David Vaseliou over 4 years ago in reply to Frank Xiao

TI__Expert 6820 points

Hi Frank,

I do not see the discrepancy between the two signals on my set up. Are the I2C pins using a different rail? Also, do you know of anything in the system that is turning on at the same time as the drop?

Thanks,

0 David Vaseliou over 4 years ago in reply to David Vaseliou

TI__Expert 6820 points

Hi Frank,

Do you have any update on this information?

Thanks,

0 Frank Xiao over 4 years ago in reply to David Vaseliou

TI__Genius 12055 points

Hi David,

in this board, we have tried many sockets but the same phenomenon. We will try more in other project in the future. For this project, i have convinced the customer to use it. Thanks.

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TMP431: the THERM_N has a drop when V+ start up