• State Resolved
  • Locked Locked
  • Replies 2 replies
  • Subscribers 30 subscribers
  • Views 379 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.

About TMS570LS31 Control Card ADC Input Option

Furkan Aydogan1
Intellectual 450 points
Other Parts Discussed in Thread: TMS570LS3137, TMS570LS1227

Hi,

I have a question about TMS570LS3137 Control Card's ADC input option. At TI's website and control card'sUser Guide, it says control card has 5V/3V ADC input configuration but when i check card's schematic, MCU's ADC supply voltage pin (VCCAD) connected to the 3.3V.

I think it's not possible to use 5V ADC with supplying ADC's ADREFHI and ADREFLO pins with 5V and GND. Because TM570LS3137 datasheet says, ADREFHI voltage must be smaller than VCCAD.

So how i can use this card's adc with 5V or why TI's user guide and website says it has 5V/3V ADC config. ?

  • 0
    TI__Guru 68920 points

    Furkan Aydogan1 said:

    Furkan,

    Yes, this is a mistake on the website, thank you for pointing it out.

    The TMS570LS1227 control card has an adjustable regulator that can be used to select 3.3V or 5V.

    But that's not possible on the TMS570LS3137 control card.    You might want to switch to a LS1227 if you can get by with less flash memory and slightly less RAM at least as far as you need to work with the control card.
    When you build your own board of course you can use the TMS570LS3137 ADC at 5V.

    I'll let our marketing people know about the website issue.

  • 0 in reply to Anthony F. Seely
    Intellectual 450 points

    Hi Anthony,

    I verified your answer and later i have checked TMS570LS1227 Control card's schematic but its VCCAD pin supplied with 3.3V too.

    Here its sch. : http://processors.wiki.ti.com/images/b/ba/TMS570LS12x_CNCD_SchematicRevA.pdf