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Question, i.MX257 external cap for NVCC_DRYICE

Question asked by Masamichi Miyamoto on Oct 26, 2018
Latest reply on Oct 26, 2018 by igorpadykov

Dear team,


My customer is trying to re-new their i.MX257 custom board. And they have a question about the external capacitor which should connect to NVCC_DRYICE.

Now they are using a ceramic capacitor for the external capacitor.

For general, a ceramic capacitor has a DC-Bias-Characteristic which the capacitance can decrease.

On your datasheet, it is said that “An external capacitor no less than 4 μF must be connected to NVCC_DRYICE.”.

Could you show me whether one has to consider also the capacitance decrease when selecting the capacitor?