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LAUNCHXL-CC1352P: CC1352P1 and AEM10330 Energy Harvester Capacitor Recharging Issue

Alireza Maleklou
Prodigy 10 points
Part Number: LAUNCHXL-CC1352P
Other Parts Discussed in Thread: CC1352P,

Hey Guys,

I'm currently working on a project that involves a CC1352P1 Launchpad board coupled with an AEM10330 energy harvester chip. For this setup, I've adhered to the circuit design outlined in the datasheet. Initially, the harvester chip works perfectly when the capacitor is charged and connected to the board. However, I've run into a peculiar issue. Whenever I turn off the light, which causes the capacitor to discharge, and then turn the light back on, the capacitor doesn't recharge. To overcome this, I have to disconnect the harvester chip from my board, wait briefly, then reconnect it, and it functions again.

I'm utilizing the Zephyr Project Operating System for this project and employ the power_off() function to shut down the board. It is then activated with an external key, ensuring the microcontroller remains low power. Despite these measures, the problem persists. To isolate the issue, I even flashed a program without the RTOS on my Launchpad board to check if the RTOS was the culprit. Unfortunately, the issue remains, even when the board is in shutdown mode.

Could anyone offer insight or assistance with this issue?

  • 0
    TI__Genius 10365 points

    Hi,

    We typically only support the CC1352P/TI products portion of the circuit (the AEM10330 is not a TI product) but there are some potentially important details for solving this issue - please provide more information on your circuit (how are you connecting this to the LAUNCHXL-CC1352P1, what are the component values, ect.)?

    This will help with trying to isolate the root cause.

    Regards,

    Zack

  • 0 in reply to ZC
    Prodigy 10 points

    Hi, thanks. I use the same as Datasheet. I connect the Nodes of Application Circuit to 3v3 and Gnd of my Launchpad Board

  • 0 in reply to Alireza Maleklou
    TI__Genius 10365 points

    Have you measured the behaviour using an oscilloscope to confirm what the charging behaviour of CLOAD is?

    When you mention "When I turn off the light", ect. - is this a custom PCB connected to a LAUNCHXL-CC1352P1 with jumpers?

    It also might be worth double-checking Section 9.3 (Load Configuration) of the AEM10330 datasheet as that details the conditions for charging CLOAD.

    If the issue is not with the CC1352P I will reassign this to the power management Applications team (it was assigned to the Wireless Connectivity team because of the CC1352P) - they will have more experience with this.

    Regards,

    Zack

  • 0 in reply to ZC
    Prodigy 10 points

    Thanks!

    1-Have you measured the behaviour using an oscilloscope to confirm what the charging behaviour of CLOAD is? Yes, that is the Point. The Load Voltage can not reach the wanted Value. I should disconnect to be charged

    2-When you mention "When I turn off the light", ect. - is this a custom PCB connected to a LAUNCHXL-CC1352P1 with jumpers? No

    3- If the issue is not with the CC1352P I will reassign this to the power management Applications team (it was assigned to the Wireless Connectivity team because of the CC1352P) - they will have more experience with this.  >>>>> Yes  please

    Thanks again

  • 0 in reply to Alireza Maleklou
    TI__Genius 10365 points

    I will reassign it in that case. As the part in question is not a TI part I am not sure how much support you will receive. I would recommend contacting the AEM10330 manufacturer for assistance with this.

    For future reference, we cannot know what measurements you have performed and your circuit, ect. if you do not provide specific information.

    Descriptions such as Whenever I turn off the light, which causes the capacitor to discharge, and then turn the light back on, the capacitor doesn't recharge without specifying the capacitor in question (or how you concluded this) is quite vague and as it is not TI hardware we are not necessarily familiar with the parts you are talking about.

    Typically, the more information and context you provide in the initial post the better - it helps us help you faster!

    Regards,

    Zack