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C67x as a replacement for TMS320VC33

Hussein Kaouri
Prodigy 30 points
Other Parts Discussed in Thread: TMS320VC33, TMS320C5535, SM320VC33-EP

Hi,

We are currently using TMS320VC33 as a low power floating point DSP clocked as low as 3 MHz in order to provide real time biquad filtering. We need to keep the power consumption very low for our portable devices as well as doing floating point. The TMS320VC33 is consuming about 7 mW in this configuration. Knowing that TMS320VC33 is not recommended for any new design we were advised to move to the C67x series but this DSP series consumes about 8 mW while in sleep mode and once it is clocked at 3 MHz the power consumption rises to more than 20 mW which is almost three times as much as the TMS320VC33 at 3 MHz clock.

Could you please advise us if there is an alternative floating point solution from TI that can possibly replace the TMS320VC33. Is there a plan for TI to produce something similar to TMS320VC33 DSP.

Kind Regards

HKaouri

  • 0
    TI__Genius 14965 points

    Hi,

    Can you consider to use 16-bits fixed point DSP for your replacement? We have very low power DSP available now. You may have to run at higher CPU frequency but it consumes a lot less power than C67X series.

    http://www.ti.com/product/tms320c5535

    Regards,

    Hyun

  • 0 in reply to Hyun Kim
    Prodigy 30 points

    Hi Hyun,

    Thank you for you quick reply. We have already tried the tms320C5535 DSP. We found that we have to clock it at a much higher frequency and it does not give us enough accuracy and dynamic range for our calculations as it is a 16 bit DSP.

    We know that TI does not recommend the TMS320VC33 DSP for new design. However, could you please tell us for how long the TMS320VC33 is going to be in production and if there is a PGA version of this chip and what is the cost if PGA exists.

    Kind regards

    Hussein

     

     

  • 0 in reply to Hussein Kaouri
    TI__Genius 14965 points

    Hi Hussein,

    What I meant was to use floating point (32-bit) calculation with 16-bit DSP. It adds complexity and it should bump up the frequency. But it keeps accuracy and dynamic range. 

    Anyhow, it looks we don't have a PGA package for TMS320VC33. 

    Regards,

    Hyun

  • 0 in reply to Hyun Kim
    Prodigy 30 points

    Hi Hyun,

    Many thanks for your feedback and cooperation.

    We have tried using floating point with tms320c5535 but then the maximum clock was not enough to do our calculations and the power consumption went above the limit we want which is about 6 mW in total that we can achieve with tms320VC33 running at 3 MHz clock.

    Any idea for how long TI is planning to keep tms320vc33 in production. Is there any plan by TI to replace it with something similar in terms of power consumption.

    Kind regards

    Hussein

  • 0 in reply to Hussein Kaouri
    TI__Genius 14965 points

    Hi Hussein,

    There are SM320VC33 part available as a qual flat package and ceramic BGA package. For the pricing, you should contact your local TI sales.

    http://www.ti.com/product/sm320vc33-ep

    As soon as I get an answer back regrading how long the VC33 will be in production, I'll let you know.

    Regards,

    Hyun