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shachar
Visitor
Visitor
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Registered: ‎09-16-2020

super capacitor for VCC_PSBATT

Hi,

I'd like to replace the battery attached to VCC_PSBATT in Zync UltraScale+ RFSoc device with a super capacitor.
Where can I find guidelines how to connect it ? Does it need to be connected to VCCAUX through a resistor ? what it the resistor value ? 

Thanks

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tenzinc
Moderator
Moderator
99 Views
Registered: ‎09-18-2014

Most likely the super/ultracapacitor vendors or distributors. I believe Xilinx itself has been testing and qualified with the standard battery as back up power source so we do not have specs or guidance on that yet. I don't see why this would not work if you ensure the supply specs are met at the Zynq RFSOC device. Caps do discharge so they will have a different supply profile and that needs to be considered. You will need to charge it from a power source in certain intervals to keep the voltage within the supported 1.2-1.5V range. 

 

https://www.digikey.com/en/videos/e/eaton-electronics-division/how-to-correctly-size-a-supercapacitor

 

https://www.xilinx.com/about/contact/locations.html?preSelect=Authorized%20Distributors#authorizedDistributors

 

Regards,

TC



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