Impact of Ripple on Vdd when using a Microchip Microcontroller

As long as the current stays between the datasheet specified limits the device should work. Take steps to ensure that the device stays within the specified voltage limits as the microcontroller may not recover after operating out of range.

If your design is experiencing ripple pay attention to what is happening on the "ripple edges", ensuring that they are visible as momentary glitches can occur.

To reduce ripple which is not sourced by the microcontroller, consider either of the following:

  • A small resistor in series with the MCU's decoupling capacitor.
  • A series diode may be more useful.
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