Kinetis Microcontrollers中的主题 Re: KEAZN64's power consumption in stop mode

KEAZN64's power consumption in stop mode

zhangzhiyong — Mon, 08 Jun 2020 08:31:07 GMT

Hi，

We test the KEAZN64's power consumption in stop mode，we use the TRK-KEA64 demo and the TRK_KEA64_PMC （S32 Design Studio for ARM Version 2018.R1），the temperature is room.

We measure the power supply current is 111μA，but the datasheet write the current is 2μA.

We check the code,the LVD is disable,and RTC adder causes Idd to increase typically by less than 1 µA.

What is the cause of high power consumption？

Re: KEAZN64's power consumption in stop mode

jingpan — Tue, 09 Jun 2020 09:37:26 GMT

Hi,

Do you connect debugger when testing? The active debug will prevent the chip from entering low-power mode. In case the chip is already in low-power mode, a debug request from MDM-AP control register will wake the chip from low-power mode.

Regards,

Jing

Re: KEAZN64's power consumption in stop mode

zhangzhiyong — Tue, 09 Jun 2020 09:45:50 GMT

Hi，Jing

Thanks your support. I've noticed that, we downloaded the code to the board(TRK-KEA64), disconnected the dubugger(Jlink) and reset.

But the the power supply current is 111μA.

Re: KEAZN64's power consumption in stop mode

jingpan — Fri, 12 Jun 2020 06:57:57 GMT

Hi,

It seems you project is copy from FRDM_KEA64_PMC. I tested on my FRDM board. I disconnect the SWD_CLK and SWD_IO jumper. The current drop to 2uA. So, I think you needn't worry.

Regards,

Jing

Re: KEAZN64's power consumption in stop mode

shubhampardeshi — Fri, 23 Oct 2020 13:57:08 GMT

Hi @zhangzhiyong @jingpan ,

Thanks for sharing above, i am also able to achieve it with current <1mA, however i want to wakeup from low power mode(Stop mode) and start with Run mode.

But my KBI interrupt or Low power RTC(~1Khz) interrupt is not getting.

Please help me on this so that i can wake up controller on interrupt.

one more thing once i use wfi instruction then i am not getting interrupt.

I tried with attached piece of code, i am using PmcModeStop3.