Super-Cap on i.MX RT1052 VDD_SNVS_IN?

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Super-Cap on i.MX RT1052 VDD_SNVS_IN?

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ScottKerstein
Contributor III

Hello,

If VDD_SNVS_IN is directly supplied by a super-cap what are the design guidelines? Real-time counter needs to be preserved in the design.  Is a schottky diode still required between VDD_HIGH_IN and VDD_SNVS_IN? 

Thanks, in advance.

Scott 

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jeremyzhou
NXP TechSupport
NXP TechSupport

Hi Scott Kerstein,

Thank you for your interest in NXP Semiconductor products and for the opportunity to serve you.
1) If VDD_SNVS_IN is directly supplied by a super-cap what are the design guidelines? Real-time counter needs to be preserved in the design.
-- A coin battery is a good choice.
2) Is a Schottky diode still required between VDD_HIGH_IN and VDD_SNVS_IN?
-- Please review the Fig 1.

pastedImage_1.png

Fig 1


Have a great day,
TIC

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