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Forum Post: MSP430F5528 External Oscillator Capacitor Selection XT1

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Good afternoon,

I am working on a PCB for a MSP430F5528. I am already using the MSP430F5529 development board but I am confused on the use capacitor selection for the external low frequency crystal on XT1. I tried to use the information on the SLAA322B application note but I looks like this does not take into account the XCAP register value. So in case I set XCAP to 0x00 I got 2 pf  on the pin XIN and XOUT what size of C I should select to mount externally with the crystal?

Accordingly to my computations should be23 pf.

Is that value correct?

I would really appreciate some help to came out given the value of capacitance requested by the crystal (12.5 pf  of 6 pf) and given the XCAP setting I need to mount on my PCB.

Thank you

Marco


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