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BBB power consumption

Other Parts Discussed in Thread: AM3358, TPS65217

Dear TI

for the BBB has sitara AM3358 processor the data sheet says it can operate in one of these clock frequencies 600 MHz 800 MHz 1000 MHz 

Questions:

1). is there a way to step down the clock frequency bellow 50 Mhz the idea is to save power i know there is a sleep mode but our requirement is not to keep in sleep mode at all rather clock the frequency very low so that it consumes very less power.

2) is there a way to measure the total power consumed by the complete BBB hardware not by using multimeter but by using an IC with i2C interface so that the processor just reads the total power consumed.

Regards

Nick

  • Hi,

    1. What software are you running on the BBB? Lowering the MPU frequency will not bring you overall power savings, as this will affect only the Cortex-A8 core.
    2. No, BBB does not have such hardware.
  • thanks Biser Gatchev

    I am running default Debian image. that is fine if not the overall power i must at least reduce the CPU power consumption.

    Question:

    1) how can i reduce the CPU clock frequency bellow 50 MHz.

    Regards

    Nick

  • This forum supports only the TI Processor Linux SDK. For Debian support please ask the community at: beagleboard.org/.../Forums
  • continuing the previous power consumption discussion

    our project needs some serious calculation on power consumption can you please help
    the data sheet for PMIC TPS65217 says in sleep mode
    --------------------------------------
    SLEEP state is a low-power mode of operation intended to support system standby. Typically, all power rails are turned off with the exception of LDO1 and the registers are reset to their default values. LDO1 remains operational but can support only limited amount of current (1 mA typical).
    ---------------------------------
    Questions:
    1) in sleep state will the DDR3RAM,MMC0,MMC1,LAN phy chipset are they all turned off ?
    2) If not which all components on BBB are turned off and which are on?


    Regards.
  • Do not mix PMIC sleep mode with processor sleep mode. PMIC sleep mode corresponds to processor RTC-only mode, which is basically the processor turned off and only the RTC running for time-keeping purposes. Exit from RTC-only mode is equal to cold boot.