• State
  • Locked Locked
  • Replies 2 replies
  • Subscribers 99 subscribers
  • Views 387 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.

AM335x Clock question

Raul Matos
Expert 5125 points
Other Parts Discussed in Thread: AM3358, AM3356

Greetings!

Is it possible to diminish the Main CPU clock in order to reduce power comsumption?

What would be the least clock value for devices normally operating in 720Mhz and 250Mhz?

When runnning Linux PSP : Dhrystone at 550Mhz it would comsumpt 688mW, if I reduce the CPU clock to 250Mhz what would be the new power value?

 

 

 

Thanks in advance

  • 0
    Prodigy 180 points

    Hello Raul,

    I think I've read somewhere that 250MHz is at the moment not supported with AM3358/9; only 500, 600 and 720MHz. Future devices shall support it (eg. AM3356 and 7).

    Best regards,

    Miha

  • 0 in reply to Miha Gostencnik
    TI__Guru* 86060 points

    You can technically adjust the frequency down to whatever you want for a certain OPP.  The frequency values shown in the datasheet are max values, so to save power you could drop down to 250MHz at the 1.1V voltage level.  To further save power, the datasheet provides an OPP50 (50% operating point), which allows you to drop the voltage as well, but this also requires you to adjust other chip level frequencies for DDR and Interconnect clocks. 

    You can get an idea of power consumption for different use cases here:  http://processors.wiki.ti.com/index.php/AM335x_Power_Consumption_Summary

     

    Regards,

    James