• State Resolved
  • Locked Locked
  • Replies 1 reply
  • Subscribers 82 subscribers
  • Views 336 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

TMS320F28P650DK: Sharing analog input among different ADC subsystems? Help with understanding the SysConfig & Datasheet

Jiri Panacek85
Expert 3251 points
Part Number: TMS320F28P650DK
Other Parts Discussed in Thread: SYSCONFIG

Tool/software:

Hello,

I design an experimental board where I want to bring 3 analog signals to two different internal ADC subsystems (ADC-A, ADC-B). I work with the technical reference and the SysConfig tool v5.04.00.00 (online).

The figure 6-47 indicates that ADCINA1 is the input for ADC-A ch. 1 as well as ADC-B ch. 19 (highlighted with blue arrows in the attached picture). However, when I try this configuration in SysConfig tool I get a warning that the selected channel has no device pin.

Additionally, the name of that pin in the device datasheet is only A1.

However, the very same situation happens with signals A14, A15 (highlighted with yellow arrows). These pins have label A14/B14/C14 and A15/B15/C15. I also won't get any warning in SysConfig.

The question is, if I can truly rely on figure 6-47 and assume, that ADC-B sees analog inputs ADCINA1 on channel 19, etc.

Are there any fundamental differences between pins A14/B14/C15 that are clearly wired to all ADC subsystems compared to ADCINA1 that shall be too wired to multiple ADC subsystems?

Many thanks,

Jiri

  • +1
    TI__Expert 3350 points

    Hi Jiri,

    The idea here is to provide more flexibility in design in way that we can have access to the same signal in different ADC. For example, in safety application, you can compare your results to see if ADC is working properly.

    On the warning in the image, I am letting the team internally to update it. It will be revised in next revision.

    Thanks,
    Susmitha