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关于片上电源的去耦电容

Other Parts Discussed in Thread: CONTROLSUITE

求问~~~第一次画控制板,核心芯片使用F28335....芯片上有好多1.9V和3.3V的电源,是每个电源都要加电容么?加多大的呢?如果嫌麻烦可以少加几个么?