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Slow clock accuracy on CC2564MODA

Other Parts Discussed in Thread: CC2564MODA, CC2564

Hi, Everyone

I have a question about slow clock of CC2564MODA.

Why slow clock need clock accuracy of ±250ppm ?
CC2564B datasheet mention

The accuracy of the slow clock frequency must be 32.768 kHz ±250 ppm for Bluetooth use (as specified in the
Bluetooth specification).

My customer want to know anout more deeply reason.
If user use other competition device,clock accuracy is needed by Bluetooth specification ?

I guess CC2564 need clock accuracy, because interface is UART.
This understanding is correct ?

Best Regards
Hiroyasu