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F28335 ADC Port

Aero
Prodigy 185 points
Other Parts Discussed in Thread: CONTROLSUITE

Hi, 

    1)  I want to connect an analog signal to the ADC port. I connected the positive wire to ADC IN7, however i am confused where to connect the ground. Whats the difference between ADCL0 and normal GND PIN on the ADC port. 

2) How can I visualize what ADC records after downloading the simulink program through code composer in simulink. I tried to see the ADC registers in code composer but, it didnt help. 

3) The analog signal always remains between 1.5 and 2.5 volts is there any need for protection circuit. It is comming from the output of LVDT signal conditioner. 

Thanks 

  • 0
    Guru 192875 points

    Hi Aero,


    What hardware are you using? F28335 experimenter's kit ?

    Aero said:
    1)  I want to connect an analog signal to the ADC port. I connected the positive wire to ADC IN7, however i am confused where to connect the ground. Whats the difference between ADCL0 and normal GND PIN on the ADC port. 

    ADCLO should be connected to analog ground as its the Low Reference signal. So if you check the datasheet, you can connect ADCLO to rest of analog ground pins.

    Aero said:
    2) How can I visualize what ADC records after downloading the simulink program through code composer in simulink. I tried to see the ADC registers in code composer but, it didnt help. 

    Sorry, simulink based support is not available on this forum . Please contact Matlab forum for C2000 devices.

    Aero said:
    3) The analog signal always remains between 1.5 and 2.5 volts is there any need for protection circuit. It is comming from the output of LVDT signal conditioner. 

    Aero said:
    3) The analog signal always remains between 1.5 and 2.5 volts is there any need for protection circuit. It is comming from the output of LVDT signal conditioner. 

    If you check the F28335 control Card schematics in controlSuite you can find protection circuitry.

    Regards,

    Gautam

  • 0 in reply to Gautam Iyer
    Prodigy 185 points

    Yes  I am using F28335.

  • 0 in reply to Aero
    Guru 192875 points
    Ok. I hope you checked the replies too.
  • 0 in reply to Gautam Iyer
    Prodigy 185 points
    thanks and do you mean that i should connect ADCL0 to all of the gNDs on port 9 or only one.
  • 0 in reply to Aero
    Guru 192875 points
    You've 2 GNDs namely Analog and Digital. You've to connect it to Analog GND or AGND.
  • 0 in reply to Gautam Iyer
    Prodigy 185 points
    Pardon me its bit confusing, if you look at the ADC of the F28335 Port-9 in the manual, you only see two kind of labels for ground GND and ADCL0. In my case I have two wires, positive wire to the ADC IN7 and about black wire i got confused wether to connect it to the pins labeled GND in the manual or to the one named ADCL0
  • 0 in reply to Aero
    Guru 192875 points

    If you check the Table 2-3 Signal Description you'll find this info:

    Here, Analog Grounds are clearly mentioned. So in your case if GND indicates this Ground then connect it here or if ADCLO is already grounded: you can connect it there too.

    Regards,

    Gautam