CYW43907 power savings by floating USB pins...

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MichaelF_56
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Team,

I'm working with DavidD_91​ on a new opportunity where the customer is looking to save additional power by not using the USB interface on the CYW43907 under WICED.

Would you know if the following pins could be left floating to accomplish this goal?

  • USB2_AVDD33
  • USB2_AVDD33IO
  • USB2_AVDD33LDO

Thanks in advance for the guidance.

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Aditi_B
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Hello,

Thank you for your patience. This is what the product team replied-->

For all 43907 module designs (i.e. from Murata, USI or SPIL), only USB2_VDD_3V3 is available for which guidance is provided in the Eval User Guide to connect it to GND when USB is unused. USB2_AVDD33, USB2_AVDD33IO, USB2_AVDD33LDO --> these signals are not accessible at the output of any of these modules, thus no action is required in regards to these signals. So, even if you use the USB interface or not, it doesn't matter because these pins can't be accessed. Only this pin-->USB2_VDD_3V3 needs to be taken care of.

Thanks

Aditi

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