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AM625: DDR4 and LPDDR4 Power consumption during deep sleep mode and Boot Time

Gencay Akyuz
Intellectual 305 points
Part Number: AM625

Hello,

I have a few questions about sitara am625 MPU, we are planing to use it for our cost sensitive and space constraint HMI application;

  1. What is the current consumption during deep sleep mode for LPDDR4 and DDR4? How much difference does type of the DDR have on this value on the deep sleep mode?
  2. What is the fastest achievable boot time for a typical HMI application? For cold boot, if boot time is greater than a few seconds we are thinking to keep the device at deep sleep mode after first boot. So for an average build, what is the approximated boot time and if boot time is not short enough for our needs, at the deep sleep mode how much current is drawn?

Thank you in advance

  • 0
    TI__Expert 8275 points

    Hi,

    I can help with question 1:

    In Deep Sleep mode both DDR4 and LPDDR4 were measured to consume about 1mW of consumption in nominal conditions. 

    In standard power modes it was measured that LPDDR4 consumes less than half of the measured power of DDR4, in nominal Linux applications.

    Regards,

    Colin

  • 0 in reply to Colin Callaghan
    Intellectual 305 points

    In deep sleep mode, what is the current drawn at 5V PMIC input for DDR4/LPDDR4 RAM?

  • 0 in reply to Gencay Akyuz
    Intellectual 305 points

    And After wake-up is everything continues where it was? Is boot time shorter than cold boot?

  • +1 in reply to Gencay Akyuz
    TI__Guru**** 168201 points

    Hi Gencay,

    I will defer the power related questions to Colin.

    Regarding Linux boot time or suspend/resume time - the last time I measured the resume time (from deepsleep) a couple months ago was about 700ms. Please note that at this moment the deepsleep feature on AM62x is still under development, several peripherals/modules do not support suspend/resume yet so they are disabled at this moment. Which means the resume time might be a little bit longer once the deepsleep is fully supported.

    The Linux cold boot time is heavily depending on the applications. On AM62x SK EVM, I optimized u-boot, kernel, and rootfs, and managed to get the boot time down within 2 sec (1.6 sec from the first line of uboot console log messages to Linux login prompt). Of cause, adding applications to Linux would increase the boot time.