PGA900: OWI can't activate PGA900

Hello,

Today , I had a problem,

OWI can't activate  PGA900

the High voltage is 6.5V

the Low voltage is 5V

when I change the VDD  from 5V  to 6.5V then 5V ,but can't activate the IC。

who  are kind enough to help?

thanks and best regards

Kim

Kailyn Chen：

Hello，PGA900 is one NDA product, did you have requested the full datasheet from the TI website?

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jinyan ma：

thanks for your reply.I have already got the full datasheet.

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Kailyn Chen：

OK, I need to confirm this question again, and I would reply you as soon as possible.

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jinyan ma：

thanks a lot

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Kailyn Chen：

No problem, and I would  reply to you once I  have confirmed about this problem. 

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Kailyn Chen：

Hello， are you using the EVM or your own board? Note that the OWI voltages referenced in the datasheet need to be the voltages directly at the VDD pin, and not the supply to their total application. If you send the activation pulse described in the OWI activation section of the datasheet that should enable the OWI transceiver. If you are using a debugger while testing firmware you can see the OWI activation interrupt get triggered.

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jinyan ma：

Hi Kailyn:

thanks for your reply.I  inputed  the OWI voltages directly at the VDD pin, But unfortunately , the IC PGA900 can't triggered the OWI activation interrupt. It seemed the IC was reset.

I don't know why.

Kim

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Kailyn Chen：

Hi Kim,

Are you using your own board or the EVM board?  

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jinyan ma：

Hi Kailyn:

    on my own board. 

thanks a lot , now I know the reason.  the slew rate on VDD should below 0.5V/us

    best regards.

Kim

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Kailyn Chen：

Kim, thank you very much for your feedback.  Any other questions, please contact me again.

Best regards

Kailyn