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TMS320F28P550SJ: ADC external reference as 3.0V

Wayne Huang
Genius 15395 points
Part Number: TMS320F28P550SJ
Other Parts Discussed in Thread: REF6230

Tool/software:

Hi Champs,

I am asking this for our customer.

1. If the user uses 3.0V by an external ADC reference, what register/driverlib API should the user use?

In Table 14-6. Reference Summary of TRM, there is such a description, which confuses us. 

Does that mean the user cannot use VREFHI = 3.0V because it seems there are only VREFHI < 2.97V and VREFHI = 1.65V?

We think the user should set ANAREFA1P65SEL = 0 and REFPMUXSELE = 1. Is it right? 

2. On F28P65x launchpad, we use REF6230, with an integrated buffer, for 12-bit ADC. 

https://www.ti.com/lit/gpn/ref6230

We think REF6230 can also be a good candidate for F28P550x.

Is it right?

  • +1
    TI__Prodigy 160 points

    Hi Wayne,

    Yes you are right. 

    Wayne Huang said:
    set ANAREFA1P65SEL = 0 and REFPMUXSELE = 1

    above setting can be used for using External reference where VREFHI >2.97 V (3V in this case ).

    Driverlib Function to be used ADC_setVREF(ADCx_BASE, ADC_REFERENCE_EXTERNAL, ADC_REFERENCE_2_5V), same settings as mentioned to make above mentioned register bit configuration. 

    2. Yes we can use the REF6230 with device as well with above mentioned configuration. 

    Thanks,

    Nilesh