24 ADC registers

Rob,

The 24 inputs are the total number available for the entire device, contributed by the 4 ADC modules.

If you look at the Signal Descriptions table under the Terminal Configuration and Functions chapter, you can find all 24 signals enumerated by the ADC module letter and channel number.

-Tommy

Yes, the table you mention shows the pin descriptions, but where is the associated documentation for the programming side?

If I go to:

www.ti.com/.../TMS320F28375D

and click on:

www.ti.com/.../spruhm8e.pdf

go to section 10.1.2 for example, it still shows a 16 input mux, even though the pinout shows 6 ADC inputs per ADC

or if you go to table 10-12, notice how it only lists to SOC15 (0-15 = 16 SOC)

So on the programming side where is the 'update' to account for the extra inputs?

or table 10-20, the int sel needs to show EOC from 0-23 correct? I can generally follow the pattern, but I need to be sure that is how it is working. using table 10-20 as an example, are you now using the reserved bit 4 for the extra ADC's since you only used 4 bits for the 0-15...

It' snot that I need to know which bits you use, I just don't want to 'assume' something (follow the pattern) and have the pattern break somewhere.

Can you confirm that I just follow the general pattern and extend it from 0-15 to 0-23? Is there any exceptions to this? Alternately where is the updated documentation for the 24 inputs.

Thanks.

Rob,

Each ADC has its own set of configuration registers and they operate independently of each other. The theoretical maximum number of supported inputs for 4 ADCs with 16 channels each would be 4x16 = 64 inputs. This device only has 24 inputs distributed between the 4 ADCs.

I would recommend that you download controlSUITE and reference the ADC software examples to see how this works.

-Tommy

That helps a lot.

So your saying that if I physically wire some input to ADCINA0, then I would have to set the SOC input to read ADCIN0 to read what is wired up to the physical ADCINA0 pin.

So in effect whatever Is hard wired to the associated Input pins can only be read on the associated ADCA,B,C,D, as seen in diagram 9-1.

I assume there is a typo on figure 9-1... it doesn't show ADCINC0 and ADCINC1 correct? as such it's only showing 22 inputs not 24...

I think I understand now how your getting the 24 inputs into the part.

THanks.