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SD24 ADC in 430AFE223

Other Parts Discussed in Thread: MSP430AFE223

Hi,

430AFE223 has two SD24 converters and each converter has only one analog signal pair with it. I believe this since in the CPU i/o pin configuration in the datasheet, it shows the 3 pair signal pins for this ADC inputs.

On the other hand, from the fig 27.1 in slau144i.pdf, it shows each channel of the ADC has the Eight input pair. If this is true, the CPU i/o pin should show 16 pair i/o signals on the i/o pin configuration.

Please confirm that the datasheet is correct and(fig 27.1 in slau144i.pdf is not correct) or...

Thanks,

Mark

 

  • sm3447 said:

    430AFE223 has two SD24 converters and each converter has only one analog signal pair with it. I believe this since in the CPU i/o pin configuration in the datasheet, it shows the 3 pair signal pins for this ADC inputs.

    Please confirm that the datasheet is correct

    Both the data sheet and the user's guide for the MSP430AFE223 are correct.  The user's guide is generic, covering the superset of all applicable parts that may have a SD24_A.  The data sheet is specific to each device or group of deviecs, showing what subset is used.

    In the user's guide, find, "SD24INCTLx, SD24_A Channel x Input Control Register."  See the comment at the bottom.

    Ax.1 to Ax.4 not available on all devices (see device-specific data sheet).

  • Jason,

    Thanks for the answer.

    The issue is: A single converter ( or a channel) with a muxing function which is for multiple analog inputs OR multiple converters ( or multiple channels,  see Fig27-1 in slau144i), these two configurations are different. For the first one, it can handle the multiple input in the sequencial manner, and the second one is able to convert input signal concurrently.

    In Fig27-1, it shows muliple channels ( I think this means multiple converters) ADC, and each channel has its muxing section to handle multiple inputs.

    So for 430AFE223, its ADC is the first one with a single converter which has 2 mux inputs, or it has two independant converters? Please confirm for one of them.

    Mark

  • The AFE datasheet reads 'Up to three 24bit Sigma-Delta ADCs'. That means there are up to three SD24_A converters with one channel each.

    The alternative setup would read 'Sigma Delta ADC with up to 3 channels'

    The family members table shows a column "SD24_A converters" rather than "SD24_A channels" etc.

    I agree that the difference is subtle but it is unambiguous.

  • Jens-Michael Gross said:

    The AFE datasheet reads 'Up to three 24bit Sigma-Delta ADCs'. That means there are up to three SD24_A converters with one channel each.

    Yes, as per the data sheet, "The SD24_A module integrates up to three independent 24-bit sigma-delta A/D converters."  Each converter has one external differential input pair, plus two options for internal measurements (VCC or temperature).

  • You answer seems to make thing more confused.

    In the Fig 27-1 of slau144i.pdf, it shows all the channels (ch0 to ch6) and only ch1 is with detail. In the ch1, it is with  8 analog inputs: A1.0, A1.1,... A1.7. It clearly shows each chammel is equvilent to an indepenant converter.

    So please tell me yes or no that 430AFE223 has ONE ADC converter which has 2 muxing analog inputs?

    Mark

  • All,

    It is clear now and thank you.

    Is any part available from 430 series that it has at least 4 SD24 converters in it?

     

  • sm3447 said:

    In the Fig 27-1 of slau144i.pdf, it shows all the channels (ch0 to ch6) and only ch1 is with detail. In the ch1, it is with  8 analog inputs: A1.0, A1.1,... A1.7. It clearly shows each chammel is equvilent to an indepenant converter.

     
    Yes, I now see the mistake.  Thank you for your persistence in identifying this to me.  I have submitted the error for correction. 
     
    Would this change make it clear?
     
     
    On page 631 of slau144i.pdf, replace the word, "channel," with the word, "converter," in these plcaes:

    Channel 0
    Channel 1
    Channel 2
    Channel 3 ( up to Channel 6)

    Once corrected, it would also be consistent with SD24_B on page 757 of slau208k.pdf

     

  • sm3447 said:

    Is any part available from 430 series that it has at least 4 SD24 converters in it?

     
    The MSP430F6779 has seven SD24 converters.

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