Problems with VDD_SNVS_IN in i.MXRT1024

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Problems with VDD_SNVS_IN in i.MXRT1024

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Javiurb
Contributor I

I use the VDD_SNVS_IN pin with a 0,47F SuperCapacitor and, when I lost the power supply, the voltage on this pin decreases so fast under the operating values. This situation leads to a problem. If I reestablish the power supply and this voltage hasn't lowered enough, the MCU gets stuck.

The solutions I have seen to this situation is: wait to this voltage decreases to almost 300mV (it's so much time) or make a reset with POR_B pin.

Is there another posible solution to this or something I dont have well in my design?

This is my design. I know I need to add a diode from VDD_HIGH_IN to VDD_SNVS_IN, could this issue solve my problem?

SuperCapacitor SNVS_IN.png

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Javiurb
Contributor I

Please, could reply to this problem?

Thank you.

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843 Views
Javiurb
Contributor I

Please, could reply to this problem?

Thank you.

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