https://devzone.nordicsemi.com/f/nordic-q-a/2292/crystal-less-operation-nrf51822Hi I have some questions regardning the crystals needed for the NRF51822 chip. I know that I can remove the 32kHz external clock and use the internal clock. But can I use the internal 16MHz clock instead of the external? My app does not require anyen-USTelligent Community 13Tue, 22 Apr 2014 09:49:54 GMThttps://devzone.nordicsemi.com/thread/9532?ContentTypeID=1Tue, 22 Apr 2014 09:49:54 GMT137ad170-7792-4731-bb38-c0d22fbe4515:a58a55a5-4e16-40e2-8f75-b237bbe959fcFormerMember<p>Hello,</p> <p>The nRF51822 have to be used with an external 16 MHz clock. The required frequency tolerance can be found in the <a href="https://www.nordicsemi.com/eng/nordic/download_resource/20339/11/21148373">nRF51822 Product Specification</a>, chapter 8.1.2. Unfortunately, a resonator cannot be used because it will be too inaccurate.</p> <p>Regards, Kristin</p><div style="clear:both;"></div>