What frequency does the fast clock need to be for the CC2564?

Jason Work

Genius 10830 points

Other Parts Discussed in Thread: CC2564, CC2564MODN, CC256XEM-RD

What frequency does the fast clock need to be for the CC2564?

I see conflicting information:

CC2564 datasheet says 26 MHz
- Find, "External Fast Clock Crystal Requirements"
CC2564MODN datasheet says 38.4 MHz
- Find, "fast-clock dependent are verified"
CC256XEM-RD schematic shows 26 MHz
- Find, "Y1"
CC256x System Design Guide- clocks says 26 MHz for both modules and QFN package
- Find, "applies to both devices and modules"

Which is correct, or if they do not conflict would you help me to understand how either can be used?

over 9 years ago

0 Miguel over 9 years ago

TI__Mastermind 23565 points

Hi,

I have modified the CC256x System Design Guide to better explain the requirements. Let us know if it is clearer now.

~Miguel

0 Jason Work over 9 years ago in reply to Miguel

TI__Genius 10830 points

Yes, thank you. This is now more clear on the wiki. Is the 38.4 MHz for the CC2564MODN a typo or does the module clocking operate differently internally from how customers would expect the CC2564 to work when they interface to it? Is there a case where customers would need to consider using a fast clock frequency other than 26 MHz? Some insight on the 38.4 MHz figure might help people to understand why they need not consider this frequency.

0 Miguel over 9 years ago in reply to Jason Work

TI__Mastermind 23565 points

Jason,
The CC2564MODN has a 38.4MHz XTAL inside but it is a different IC package. From a customer perspective, there is no difference to interface to it if they use a Module with a 38.4MHz clock or a device with a 26MHz clock.
Regards,Miguel~Miguel

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What frequency does the fast clock need to be for the CC2564?