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32kHz oscillator necessary on CC2564MOD?

Hi team,

My customer is interested in the CC2564MOD.  I believe there is a 38.4MHz crystal on board the CC2564MOD--However the customer saw a 32kHz oscillator attached to the SLOW_CLOCK pin in a sample schematic.  

Is this 32kHz oscillator necessary?  Can the board work with just the internal 38.4MHz crystal alone?  

The customer wants to remove the 32kHz oscillator if possible to save money and space.

I appreciate your support,

Kareem Moulana