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TMS320C6670 power consumption

Nick Carter
Intellectual 830 points
Other Parts Discussed in Thread: MSP430F5418

 

Hi,

I'm designing a development board with MSP430F5418 and 6670 on it. The main task of the 430 is controlling the power of other devices, including 6670. So I wonder

if there is a document which describes the power consumption of every part of 6670 on TI website so that I can shut them down if I don't use some parts of 6670 for a

while?

Thank you

Nick

  • 0
    Expert 1425 points

    Hi, I am not sure, but I remembered there are some power management method to close some of the cpu.

  • 0 in reply to Lucifar He
    TI__Mastermind 42545 points

    TI will publish an application note and a spreadsheet that will allow you to determine the power requirements of the C6670 in different states.  This should be published on TI.com within the next month.  The purpose of the spreadsheet is to determine the maximum power requirements for the part based on different conditions including core clock speed, temperature and which parts of the device are active.  The C6670 includes a power sleep controller which is used to place different parts of the C6670 into a low power state.  The PSC is controlled by software and can't be manipulated by an external device.  For more details see the Power Sleep Controller (PSC) for Keystone Devices User's Guide. 

    What are you trying to accomplish with the MSP430?

  • 0 in reply to Bill Taboada
    Intellectual 830 points

    Hi,Bill

    Thank you for your specified answer. MSP430's main task is to accomplish several basic function, for example, temperature sensing, controlling power sequence, controlling reset sequence, communicate with CPLD via SPI and UART interface,etc. By the way, you mentioned the PSC document. I've looked it, but it didn't tell us the specific power consumption of every part of the 6670. And I have one more question, I wonder if you could help me. We know that 6670 has 3 FFTC, so can I shutdown 1 or 2 of them to save power if I don't use them? Our sysytem is based on a 12V battery, so power consumption is very important to us.

    Thank you

    Nick

  • 0 in reply to Nick Carter
    TI__Mastermind 42545 points

    Hi Nick,

    That sounds like a good use for the MSP430.  They're useful little devices which offer a bunch of flexibility for things like power sequencing and temperature monitoring.  The PSC document is intended to be a generic user guide for all Keystone devices and doesn't contain any specific power information.  That information is captured in the power consumption spreadsheet allowing you to get a maximum power usage for your particular application.  The information in that spreadsheet is generated for power characterization of the part.  Since the current requirements can vary based on the core frequency, the temperature, the usage and the silicon process, measurement of the power consumption of a large number of parts is needed to ensure the spreadsheet information is accurate.  That testing is currently being done on the C6670 and the results should be on TI.com soon.  I don't have the specifics on the FFTC but I checked one of the power spreadsheets for a different Keystone device and found that it was using about 5mW for each 1% of usage per FFTC.  In that particular spreadsheet, setting usage of the FFTC to 10% with two FFTCs active resulted in 97mW of power consumption.  Disabling the second FFTC reduced that power number to 49mW so using the PSC to disable unused parts of the C6670 should provide you with significant power savings.  I'll try and update this post when I find out the availability of the power spreadsheet.

    Regards,

    Bill

  • 0 in reply to Bill Taboada
    Intellectual 830 points

    Hi,Bill

    Thank you very much for your specific answer. I'll contact you if I have more questions.

    Regards,

    Nick