I don't unterstand the how to calculate Rfset to modify operating frequency.
The datasheet gives with Rset connected between FREQ and GND :
Does it mean 274KOhm in parallel with Rfset ?
An other point is : on eval board, FREQ pin can be connected with a resistor to GND and another to INTVCC.
What is the function of the resistor between FREQ and INTVCC ?