https://devzone.nordicsemi.com/f/nordic-q-a/38714/nrf51822-wlscp-crystals-oscillatorsHow many crystals/oscillators do I needfor a NRF51822 WLSCP chip? I looked at datasheet and I&#39;m assuming I will need a 16 Mhz crystal, a 32Mhz crystal, a 16 Mhz oscillator, and a 32.768khz oscillator. But on 8.1.5 of the datasheet it says the 32.768en-USTelligent Community 13Thu, 20 Sep 2018 07:42:09 GMThttps://devzone.nordicsemi.com/thread/149550?ContentTypeID=1Thu, 20 Sep 2018 07:42:09 GMT137ad170-7792-4731-bb38-c0d22fbe4515:cd10495c-efec-4603-9a42-5840b4bd4059Sigurd<p>Hi,</p> <p>You will need a&nbsp;16 MHz crystal. A&nbsp;<span>32.768 kHz&nbsp;crystal is optional (there is an on-chip&nbsp;32.768 kHz RC&nbsp;oscillator on the nRF51822)</span></p> <p><span>Please take a look at chapter 11 &quot;Reference circuitry &quot; in the <a href="http://infocenter.nordicsemi.com/pdf/nRF51822_PS_v3.3.pdf">nRF51822 PS</a>.</span></p> <p><span>This&nbsp;<a href="https://devzone.nordicsemi.com/tutorials/b/hardware-and-layout/posts/general-pcb-design-guidelines-for-nrf51-series">tutorial here</a> might also be helpful.</span></p><div style="clear:both;"></div>