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How to configure unused LF pins?

I designed TPMS sensor on freescale FXTH87 and I don't want to use LF receiver, so I have to configure LF pins to avoid a floating input. What I have to do? leave pin not connected or connect to Vss, or something else?

from datasheet:
Each LF[A:B] pin will always have an impedance of approximately 500 kOhm to VSS due to the LFR input circuitry. The LFA/LFB
pins are used by the LFR when the LFEN control bit is set and are not functional when the LFEN control bit is clear.

Really appreciate your help.
 
Thank you for you reply, but if value isn't critical, can I connect directly to the ground? Is a value of impedance affects the choice of resistor? I just want to understand why it is necessary to do so.
 
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