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C5515 and bus holder and sleep mode

Aditya Pogade55079
Prodigy 185 points
Other Parts Discussed in Thread: TMS320C5515

Hello,

I am using TMS320C5515 in one of the medical application, where battery usage and backup time is critical. Do we need to pull down unused pins to reduce the power consumption or is it fine if we keep those not connected.

Secondly, what is bus holder and it's significance? Does this has anything to do with power consumption.

Thanks & regards,

Aditya

 

  • 0
    TI__Expert 8065 points

    Aditya,

    Please see the section 6.7.2 Pin Behavior at Reset in the C5515 datasheet. http://focus.ti.com/lit/ds/symlink/tms320c5515.pdf

    Any unused pins which are in Z group should be pulled down.

    Other sections you need to check to minimize power consumption:

    - 4.6.4 Peripheral Clock Gating Control Registers (PCGCR1 and PCGCR2) [1C02h and 1C03h]

    -  4.6.5 Pullup/Pulldown Inhibit Registers (PDINHIBR1/2/3) [1C17h, 1C18h, and 1C19h,
    respectively]

    - 4.6.6 Output Slew Rate Control Register (OSRCR) [1C16h]

     

    For Bus Holder, pleae see:

    - 4.8.2 Bus Holders

    - 6.3.2 Digital I/O Behavior When Core Power (CVDD) is Down

     

    Best Regards,

    Peter Chung

     

     

  • 0 in reply to Peter Chung
    Prodigy 185 points

    Thanks Peter for the information. Do we need to pulled down an unused output pin (like chip select, clock out etc) as well?

    Best regards,

    Aditya