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CDCM6208 control mode

Longchang Chen
Intellectual 1350 points

Other Parts Discussed in Thread: CDCM6208

when customer select the pin mode at power up, does customer still can use SPI to config register after power up?

  • 0
    TI__Mastermind 20900 points

    Hello Longchang,

    it is not easily possible, because the same pins are used for pin mode and SPI interface.after switching to SPI interface, you might have different output frequencies.

    What do you intend to do?

    Do you just want to avoid false frequencies coming out from the CDCM6208? During startup in SPI mode you can pull down RESETN to disable the outputs until you programmed the device. Now you could release RESETN and the outputs gets valid after the PLL is locked.

    Best regards,

    Julian

  • 0 in reply to Julian Hagedorn
    Prodigy 10 points

    How much does it take to program the device by SPI or I2C?

    One can prefer pin mode in order to configure CDCM6208 as quick as possible. And I think Pin Mode is the most rapid way to configure.

    Can such a configuration scenario be valid?

    1-Power up with Pin Mode

    2-Change the configuration mode of CDCM6208 by changing the Mode[1:0] from Pin mode to I2C at run time

    3-configure CDCM6208 by I2C at run time to different than the predefined 32 states in pin mode.

    Thanks,

    Cenk