just a short question while reading the Datasheet. What is the meaning of the Capacitors in the second line (marked red).
Do I need both (100nF AND 4.7uF) connected each of the Supply?
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Sign up to join this communityjust a short question while reading the Datasheet. What is the meaning of the Capacitors in the second line (marked red).
Do I need both (100nF AND 4.7uF) connected each of the Supply?
For three VDD (VDDIO1) pins: A 100n ceramic capacitor to each, plus a 4u7 ceramic to only one of them is sufficient.
For VDDIO2 pin: a 100n plus a 4u7 ceramic is sufficient.
For VDDA pin: a 10n plus a 1u ceramic is sufficient.
Do I need both (100nF AND 4.7uF) connected each of the Supply?
So yes, each supply rail requires its own 1u/4u7 ceramic capacitor.
100nf is used for filtering high frequency noises, and higher value capacitors (10uf-47uf) is mostly used for low frequency noises.
If you don't know the range of your noise frequency, it's recommended to use both of them for decupling your IC's power pins.
More info at: https://www.allaboutcircuits.com/technical-articles/clean-power-for-every-ic-part-1-understanding-bypass-capacitors/
100nf is used for filtering low frequency noises, and higher value capacitors (10uf-47uf) is mostly used for high frequency noises.
exactly the opposite. Remember \$Z = 1/jwC\$.
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Sep 21, 2020 at 8:24