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Part Number: TPS65987D
Unfortunately, we have been having some issues with the TPS65987D. We discovered a possible solution, but we are not sure why it works better than our original design.
Here is a description of the problem and the possible solution. Your inputs would be greatly appreciated:
Design (I can forward schematic via email)
I would recommend using the BP_NoWait setting. It seems like you were originally doing this. However, I would recommend ensuring there is a divider present on the ADCIN pin. The EVM uses a 10K/100K divider to make for a 0.909 divider ratio on the ADCIN pin. I would suggest using this divider, as this issue does not occur on the EVM.
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In reply to Eric Beljaars:
Eric, Per customer:
We followed your guidance and we believe it fixed our problem. We have a few follow up questions:
In reply to Viktorija Cecil:
1. Since the customer has an SPI-Flash on their board, there is no need to do any of the other boot configurations and instead, it is best to go directly to the SPI-Flash configuration.
2. A divider on the ADCIN pins will help with removing any noise on that pin. It is suggested to act as a filter on that pin and improves the stability of the ADCIN reading.
3. Connecting ADCIN2 directly to the ground should be no issue.
4. Yes, you can leave these pins floating if unused.
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