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the cdce913 can not nomal configuration

yi daisheng
Prodigy 30 points
Other Parts Discussed in Thread: CDCE913

Hello Everyone,

           If anyone has tried out block read for register readout of CDCE913 PLL chip.I cannot get it work.

          My situation is: the byte write, byte read  are OK, meaning i2c works fine (SCL 11kHz).

I take the programing sequence suggested by Datasheet (page12) also for block read. 

through the return value, the data successfully written to the register.  but whatever byte i set to the register, 

the data i read out is always 7 and   all output  is 27MHZ.

            Please give answers to the problem ,i  would be grateful.i have take several day s on the  problem.

           Thanks in advance

  • 0
    TI__Expert 5725 points

     

    We had a customer that had the same issue and solved it by reading the application note. If the byte read and byte write is working but not a block operation then it might be that the commandCode syntax is not implemented correctly.

     

    This syntax you can find it explained in the datasheet. Of further explained in the application notes:

    http://focus.ti.com/general/docs/lit/getliterature.tsp?literatureNumber=scaa106&fileType=pdf

    http://focus.ti.com/general/docs/litabsmultiplefilelist.tsp?literatureNumber=scaa105

    May be the following post can be also of some help:

    http://e2e.ti.com/support/clocks/f/48/p/90091/312323.aspx#312323