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ADS1256: t_11 after WAKEUP command

Damien Dusha
Prodigy 190 points
Other Parts Discussed in Thread: ADS1256

Dear All,

I am looking at Figure 19 of the ADS1256 datasheet, specifically the sequence between WREG_MUX, SYNC, WAKEUP and RDATA.  I have noted the requirement to observe timing t_11 and t_6.  As I see it, this sequence should be:

  • WREG-MUX; 0; <MUX-VALUE>
  • t_11 = 4 t_clk
  • SYNC
  • t_11 = 24 t_clk
  • WAKEUP
  • t_11 = ????
  • RDATA
  • t_6 = 50 t_clk
  • <MSB>; <UMB>; <LSB>

t_11 is missing for after the command WAKEUP.  Should this be 4 t_clk, 24 t_clk or something else?

  -- Damien

  • 0
    TI__Mastermind 44680 points

    Hi Damien,

    There is no delay required between WAKEUP and RDATA commands.

    If you are multiplexing through channels using the efficient method (shown in figure 19 of the datasheet) - then sending RDATA right away will begin the data read back of the previous conversion.

    Alternatively, you may also wait for /DRDY to go low before sending RDATA - which will then read back the new data, after conversion completes.


    Best Regards,
    Chris