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ADC121C021: How to preset the pointer?

PYTsai
Genius 9325 points
Part Number: ADC121C021

HI

The datasheet only mentioned how to do immediate read after pointer set.

But if we did not read the register immediately (we want preset the poiter first) how to preset the pointer then afterword go back to read the ADC121C021?

thanks!

  • 0
    TI__Genius 16890 points

    Hello,

    This is done by first doing a write command and setting the pointer.  This is shown in the top half of Figure 32.  The read command shown in the bottom half of Figure 32 does not need to be done at this time.  Next when you are ready to read the register make a reading of the preset register as shown in Figure 29 or 31.

    Mike

  • 0 in reply to Michael Stout
    TI__Genius 9325 points

    Mike,

    In between the preset pointer set and the reading

    1. what will happen if in between if i insert a stop condition ?

    2. is a re-start condition needed to begin my reading ?

    Thanks!

  • 0 in reply to PYTsai
    TI__Genius 16890 points

    Hello,

    It is ok to do the communication shown in the top half of Figure 32 followed by a stop.  When you are ready to read the register the pointer is already set up from your write so you read the register as shown in Figure 29 or 31.

    Mike