TFP401A: TFP401 - pin 99 (reserved)

Brian Kindel

Part Number: TFP401A
Other Parts Discussed in Thread: TFP401

I have a current hardware design with pin 99 of the TFP401 tied to ground. We have approx. 200 PCBs built this way. Can you shed any more light on the functionality of this pin.

We are seeing an issue with the display (basically an artifact). Before reworking 200 PCBs, I would like to confirm the functionality of this pin and/or determine whether we actually need to rework the assemblies.

over 6 years ago

0 Ikechukwu Anyiam over 6 years ago

TI__Mastermind 35130 points

Hi Brain,

Per the datasheet, this pin must be tied high for normal operation. If it's tied low it selects and enables the I2C bus interface and redefines some of the external mode select pins to be I2C interface pins.

Regards,
I.K.

0 Brian Kindel over 6 years ago in reply to Ikechukwu Anyiam

Prodigy 170 points

Thanks for the quick response. We were able to modify one PCB today and verify that the change addresses the issue. You didn't tell me what I wanted to hear, but definitely what I needed to know!

Thanks again,

Brian

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TFP401A: TFP401 - pin 99 (reserved)