TMS570LC4357: Regarding Decoupling Capacitors

Hi Pradeep,

Hercules devices are fabricated using advanced CMOS technology. The CMOS circuits draw large currents at every transition, producing current spikes on the supply rails. These rising and falling glitches have to be filtered before they traverse into the sensitive circuit area. The bypass or decoupling capacitors placed across power supply pins and ground are used for such filtering.

Hercules devices have several power supply pins. You need to use one capacitor on each power supply pin and should place this capacitor as close to the pin as possible. Typically small (100nF), low-ESR ceramic capacitors are used for this purpose.