HFXO External Crystal Pin Inputs

[jtbrauer]

Hello,

I see that there is an option for the HFXO external oscillator, but I do not see any place that lists which pins to connect a crystal to. Is this HFXO (and the LFXO) internal to the device, or are there pins which need a crystal connected?

Jordan

[Jay Tyzzer]

Hello Jordan,

The nRF9160 Module has both HFXO and LFXO crystals under the hood which are attached to the internal SoC.  The SoC has an internal LF RC oscillator.  Please review PS v2.1, section 5.4, Clock management that describes the use of both. The LFCLK sources may be switched on the fly. Note that the LTE modem must use the LFXO as the LFCLK source. (PS v2.1, Section 5.4.2).  

Hope this helped. 

Br,

Jay