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POWER ISSUES

ran cohen56951
Prodigy 110 points
Other Parts Discussed in Thread: OMAP3530

Hi,

Two questions regrading  Power

1. i am interfacing with a 5V SPI slave, can i connect the OMAP3530 directly to him or do i need to somehow pull voltage up (if yes how so?, pull up resistor?, driver?)

2. what is the maximum voltage i can output from a GPIO?, from what i have read it is 3.3V  but would like to be sure

 

Thanks in Advanced and

Best Regards,

Ran.

  • 0
    TI__Genius 16690 points

     

    Hello

    ran cohen said:

    1. i am interfacing with a 5V SPI slave, can i connect the OMAP3530 directly to him or do i need to somehow pull voltage up (if yes how so?, pull up resistor?, driver?)

    OMAP3530 McSPI pins only support 1.8 V. You need a voltage level translation IC between the 5V SPI slave and OMAP. Please take a look at TI voltage level translation IC website to find the IC that meets your requirements.

    ran cohen said:

    2. what is the maximum voltage i can output from a GPIO?, from what i have read it is 3.3V  but would like to be sure

    Most of GPIOs are powered by vdds power supply and support 1.8V only. GPIO120 - 129 are powered by vdds_mmc1 or vdds_mmc1a and can be configured either 1.8 V or 3.0V.  There is a good wiki article for this topic.

  • 0 in reply to kshin
    Prodigy 110 points

    Thanks Alot!

    one last quesntion if you may, regarding a 3.3V RGB based video controller connected to the OMAP3 RGB module, can i connect it directly or do i need a voltage translator as well?

     

    Best Regards,

    Ran.

  • 0 in reply to ran cohen56951
    Genius 3685 points

    Hi Ran,

    In case your video controller isn't capable of running with a separate IO supply of 1V8 you would need to have voltage translators on these lines as well. Example of such translators can be found at: http://focus.ti.com/download/aap/pdf/VLT_PF_Overview.pdf

    Best regards - Good luck
      Søren.