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DS90UB933-Q1: PCLK questions

Betty Guo
Expert 7300 points
Part Number: DS90UB933-Q1

Hi team,

I have a question about PCLK frequency of 933. The applicaiton is 933+934.933 use external oscillator, frequency is 42MHz.

The PCLK from SOC is 52.5MHz, sittime is 26.25MHz. Can the 933 transimite the 52.5MHz PCLK data when use 42MHz external osc?

as 933 datasheet show, if the 933 work in external oscillator, the PCLK should be 2 times of osc in 10bit mode, and 1.5time osc in 12bit mode. 

could you help confirm that? if no, how wo chane to working mode of 933 to allow tansimit 52.5MHz PCLK? 

thank you.

  • 0
    TI__Guru** 103215 points

    Hello Betty,

    The 933 requires these PCLK to external clock ratios when using external clock mode. There is no way to change the ratio. So if you use 42MHz external oscillator, then the PCLK should be either 84MHz in 10 bit mode or 63MHz in 12 bit mode. 

    Best Regards,

    Casey