Reduce power consumption for MangOH Red

21

No. I’m not using ULPM mode. This is kernel pm suspend. Modem radio is powered off. Power is measured using OTII simulating a LiPo battery on the battery connector (MangOH Red Rev6).

Jan 22 05:22:38 swi-mdm9x28-wp user.info kernel: [  209.060982] PM: suspend entry 2021-01-22 04:22:38.064893982 UTC
Jan 22 05:22:38 swi-mdm9x28-wp user.info kernel: [  209.061009] PM: Syncing filesystems ... done.
Jan 22 05:22:38 swi-mdm9x28-wp user.debug kernel: [  209.075336] PM: Preparing system for mem sleep
Jan 22 05:22:42 swi-mdm9x28-wp user.warn kernel: [  209.112976] Freezing user space processes ... (elapsed 0.007 seconds) done.
Jan 22 05:22:42 swi-mdm9x28-wp user.warn kernel: [  209.120985] Freezing remaining freezable tasks ... (elapsed 0.003 seconds) done.
Jan 22 05:22:42 swi-mdm9x28-wp user.debug kernel: [  209.124482] PM: Entering mem sleep
Jan 22 05:22:42 swi-mdm9x28-wp user.warn kernel: [  209.124517] Suspending console(s) (use no_console_suspend to debug)
Jan 22 05:22:42 swi-mdm9x28-wp user.debug kernel: [  209.154920] wm8944_suspend - START
Jan 22 05:22:42 swi-mdm9x28-wp user.debug kernel: [  209.156960] wm8944_suspend - OK
Jan 22 05:22:42 swi-mdm9x28-wp user.info kernel: [  209.179961] msm_hsic_leep modes during suspend
Jan 22 05:23:03 swi-mdm9x28-wp user.info kernel: [  210.500589] 	hwirq: 77
Jan 22 05:23:03 swi-mdm9x28-wp user.info kernel: [  210.500636] suspend ns:     210500619060	suspend cycles:       8118780016
Jan 22 05:23:03 swi-mdm9x28-wp user.info kernel: [  210.500619] msm_mpm_interrupts_detectable(): gpio preventing system sleep modes during suspend
Jan 22 05:23:03 swi-mdm9x28-wp user.info kernel: [  210.500619] 	hwirq: 77
Jan 22 05:23:03 swi-mdm9x28-wp user.info kernel: [  210.500619] CPU0:msm_cpu_pm_enter_sleep mode:3 during suspend
Jan 22 05:23:03 swi-mdm9x28-wp user.info kernel: [  210.500619] resume cycles:       8318269636
Jan 22 05:23:03 swi-mdm9x28-wp user.info kernel: [  210.503511] PM: noirq resume of devices complete after 2.346 msecs
Jan 22 05:23:03 swi-mdm9x28-wp user.info kernel: [  210.504163] sierra_rtc_wake
Jan 22 05:23:03 swi-mdm9x28-wp user.info kernel: [  210.504171] sierra_rtc_wake: sierra_rtc_wake 
Jan 22 05:23:03 swi-mdm9x28-wp user.info kernel: [  210.506686] PM: early resume of devices complete after 1.892 msecs
Jan 22 05:23:03 swi-mdm9x28-wp user.info kernel: [  210.511520] msm_hsic_host 7c00000.hsic_host: HSIC-USB exited from low power mode
Jan 22 05:23:03 swi-mdm9x28-wp user.info kernel: [  210.683757] usb 1-1: reset high-speed USB device number 2 using msm_hsic_host
Jan 22 05:23:03 swi-mdm9x28-wp user.info kernel: [  210.946812] PM: resume of devices complete after 440.080 msecs
Jan 22 05:23:03 swi-mdm9x28-wp user.debug kernel: [  210.948645] PM: Finishing wakeup.
Jan 22 05:23:03 swi-mdm9x28-wp user.warn kernel: [  210.948666] Restarting tasks ... 
Jan 22 05:23:03 swi-mdm9x28-wp user.warn kernel: [  210.965509] done.
Jan 22 05:23:03 swi-mdm9x28-wp user.info kernel: [  210.966049] sierra_pm_resume
Jan 22 05:23:03 swi-mdm9x28-wp user.info kernel: [  210.967656] PM: suspend exit 2021-01-22 04:23:03.972053554 UTC
22

how did you measure the module current?
In whole mangoh red board? or the current going into module?
Did you remove the USB cable from PC?

23

Whole mangOH Red board including module. No USB connected.

24

Then of course the current is higher than that in product technical specification.

25

How did you phisically measure the absorbed current?

26

You can you a USB current meter like this USB C Power Meter, LCD Display USB Meter DC 4-24V 5A UM25 Type C Voltage and Current Tester. There are many other methods, this is one of the easier ones. It’s not great at getting the spikes, but it will give you the total power drawn over time which is nice.

27

Sorry for the very trivial question, but this USB power meter must be plugged into the mangOH USB Host and measures me the dissipated power (absorbed current)? Don’t I have to use any multimeter to make such a purchase? It would be great

28

No, the USB power meter device plugs into a usb power source (your computer, for example). Then you power the MangOH using the normal USB power cable. It’s that simple, no multimeter required.

1 Like
29

Thank you @simonwerner