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CDCE421A datasheet

Alesea
Prodigy 225 points
Other Parts Discussed in Thread: CDCE421A

Please help solve my customers issue.

CDCE421A datasheet:
1) It is not clear how to shift the control bits:  LSB first or MSB ? (Description gives symmetric pattern so its not clear and there is no written statement in the document)
2) page 8 , footnote 3. It says 10 bits ? is it true or its 11 bits as described in the state machine diagram.

Thank you!
Alesea

  • 0
    TI__Expert 5725 points

    Hi Alesea,

    Some instructions have 10 bits and other 11 bits. What is stated in the state machine about 11th bit written, means that after the 11th bit is latched it will go from one state to the other one.

    About LSB first or MSB, please allow some time to confirm.

    Best regards,

    MJ

  • 0
    TI__Expert 4150 points

    Hello Olesea,

    in addition to the answer provided by my co-worker, here the other missing piece of information:

    The data packet is 11 bits long. First 3 bits are the word (register) being written to followed by 8 bits of payload – data is sent lsb first. So writing to register 001 with contents 9E will be 100 0111 1001 <- where LSB (word bit 0) is sent first. Hope this helps.

    Fritz