https://community.nxp.com/t5/LPC-Microcontrollers/LPC54S018-Drive-Current/m-p/1195714#M43185 <P>I was wondering how I measure or calculate drive current to a crystal. I don't see anything in the data sheet other then calculating the correct caps and a note saying it is critical to get the drive level correct.&nbsp;</P><P>Pg # 138 "For best results, it is very critical to select a matching crystal for the on-chip oscillator.<BR />Load capacitance (CL), series resistance (RS), and drive level (DL) are important<BR />parameters to consider while choosing the crystal."</P><P>&nbsp;</P><P>The current crystal I am using for protos is running at 25mhz, 100ohm, 6pF, 150uW (300uW max). This is fairly close to what the dev kit uses. However I would like to cross this part with something more commonly available. If any special tools are required recommendations are welcomed.</P> Tue, 08 Dec 2020 21:45:50 GMT smiller1 2020-12-08T21:45:50Z https://community.nxp.com/t5/LPC-Microcontrollers/LPC54S018-Drive-Current/m-p/1195714#M43185 <P>I was wondering how I measure or calculate drive current to a crystal. I don't see anything in the data sheet other then calculating the correct caps and a note saying it is critical to get the drive level correct.&nbsp;</P><P>Pg # 138 "For best results, it is very critical to select a matching crystal for the on-chip oscillator.<BR />Load capacitance (CL), series resistance (RS), and drive level (DL) are important<BR />parameters to consider while choosing the crystal."</P><P>&nbsp;</P><P>The current crystal I am using for protos is running at 25mhz, 100ohm, 6pF, 150uW (300uW max). This is fairly close to what the dev kit uses. However I would like to cross this part with something more commonly available. If any special tools are required recommendations are welcomed.</P> Tue, 08 Dec 2020 21:45:50 GMT https://community.nxp.com/t5/LPC-Microcontrollers/LPC54S018-Drive-Current/m-p/1195714#M43185 smiller1 2020-12-08T21:45:50Z