Abstract

MSPM0 is typically powered from a 3.3V DC supply with decoupling capacitors. A common situation here is that when the DC power supply is unstable, it is easy to cause the MCU to stop working. To overcome this problem, an external capacitors can be chosen to maintain the power supply. Therefore, it is important to select the appropriate capacitor to in the event of a power failure. In this application note, the operating time of different operating currents and capacitor values is tested, and a simple model relationship between the three is obtained, which, under the known normal operating current, can help to choose the appropriate supply capacitor.