topic Re: Capacitors on VDDA and VREFH in Kinetis Microcontrollers https://community.nxp.com/t5/Kinetis-Microcontrollers/Capacitors-on-VDDA-and-VREFH/m-p/203278#M3041 <HTML><HEAD></HEAD><BODY><P>They are bypass capacitors. They have different capacitance, ESR and ESL that help to eliminate the noise at different frequencies.</P><P>If you put only one, the noise at a frequency range may effects to working of the chip.</P><P>&nbsp;</P><P>You can get more information if google with "bypass capacitor combination"</P><P>&nbsp;</P><P>Regards</P></BODY></HTML> Wed, 08 Feb 2012 12:40:17 GMT Dekiru 2012-02-08T12:40:17Z Capacitors on VDDA and VREFH https://community.nxp.com/t5/Kinetis-Microcontrollers/Capacitors-on-VDDA-and-VREFH/m-p/203277#M3040 <HTML><HEAD></HEAD><BODY><P>I see two capacitors for VDDA and two capacitors for VREFH pins on TWR-K60N512. They are both X7R chip capacitors, 100nF and 10nF.</P><P>What is the reason to use two of them? Is it sufficient to use a single 100nF X7R capacitor near VDDA and VREFH pins of microcontroller?</P></BODY></HTML> Tue, 07 Feb 2012 00:05:14 GMT https://community.nxp.com/t5/Kinetis-Microcontrollers/Capacitors-on-VDDA-and-VREFH/m-p/203277#M3040 pozz 2012-02-07T00:05:14Z Re: Capacitors on VDDA and VREFH https://community.nxp.com/t5/Kinetis-Microcontrollers/Capacitors-on-VDDA-and-VREFH/m-p/203278#M3041 <HTML><HEAD></HEAD><BODY><P>They are bypass capacitors. They have different capacitance, ESR and ESL that help to eliminate the noise at different frequencies.</P><P>If you put only one, the noise at a frequency range may effects to working of the chip.</P><P>&nbsp;</P><P>You can get more information if google with "bypass capacitor combination"</P><P>&nbsp;</P><P>Regards</P></BODY></HTML> Wed, 08 Feb 2012 12:40:17 GMT https://community.nxp.com/t5/Kinetis-Microcontrollers/Capacitors-on-VDDA-and-VREFH/m-p/203278#M3041 Dekiru 2012-02-08T12:40:17Z