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C553x able to use 16MHz system clock?

Michael Erdahl
Genius 13505 points
Other Parts Discussed in Thread: TMS320C5535

Customer would like to use 16MHz system clock to power-down the PLL and have a common clock for other external devices. 

Is there something fundamental preventing C553x operating in bypass mode with 16MHz clock?

  • 0
    TI__Mastermind 23785 points

    Michael,

    It is documented on page 89 of the Data Manual:

    http://www.ti.com/lit/ds/symlink/tms320c5535.pdf

    A LVCMOS-compatible clock input of a frequency less than 24 MHz can be fed into the CLKIN pin for use by the DSP system clock generator.

    Cautious should be given if boot from SPI, I2C or USB. Please refer to the document for details explanation.

    Regards.

  • 0 in reply to Steve Tsang
    TI__Genius 13505 points

    For completeness, the C553x has a fixed divisor on CLKIN of 25 to derive SPI CLK of ~500KHz during boot.  Bumping CLKIN to 16.384MHz will make SPI CLK ~655KHz. 

    Thanks Steve.