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  • Case ID: 308836
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nRF7002dk nrf5340 Power Consumption

bcornell

We are currently testing the nRF7002dk with Zephyr 2.3.0. We have a application that sets up BLE and then sleeps forever in the main thread.

On our development board, we have shorted SB17 to allow us to measure the power consumed by the nrf5340 using P22.

 If I disable logging and other peripherals (SPI, I2C), I have found that if I compile and run the code with 

CONFIG_WIFI=n
CONFIG_WIFI_NRF700X=n
The idle power consumption between BLE advertisements is around 10uA. If I change the options in my prj.conf to
CONFIG_WIFI=y
CONFIG_WIFI_NRF700X=y
The idle power consumption measured at P22 between BLE advertisements increases to 1.7mA. 
To reproduce the issue, build the peripheral_lbs sample for the nrf7002dk_nrf5340_cpuapp board. The idle power consumption will be ~10uA. Then add 
CONFIG_WIFI=y
CONFIG_WIFI_NRF700X=y
CONFIG_NETWORKING=y
CONFIG_NEWLIB_LIBC=y
to prj.conf and the idle power consumption will be almost 2mA.
 
How do I achieve <1mA combined idle power consumption with the nRF7002dk?
  • 0 in reply to Marte Myrvold

    Thanks for getting back to me.

    I downloaded the latest nrf_qspi_nor.c from that link on github. After replacing the driver in my environment with the new one, I do not see any changes to behavior or power consumption. 

  • 0 in reply to Marte Myrvold

    I noticed there was a newer nRF Connect SDK version available (v2.4.0). I setup a new installation directory and was able to reproduce my test with the latest version without any changes to the power consumption. 

  • 0 in reply to bcornell

    Hi,

    I have a new update from the development team.
    First of all, this is non Wi-Fi mode and might need a fix at system level to power down QSPI properly. The developers are working on a fix where putting the Wi-Fi interface down should shut off the Wi-Fi chip (and QSPI as well), thus decreasing power consumption.

    I also got a response from someone who has patched the nRF7002 DK QSPI driver. When nRF5340 QSPI transaction is done, HFCLK192M Div4 setting is applied. I will upload the driver here.
    The zip file also has a modified version of the Wi-Fi Station sample if you want to have a look at that. It connects to an AP and disconnects. The HFCLK192M Div4 setting may lower the nRF5340 idle current by 1mA, depending on measurement conditions.

    nrf_nrf7002_hfclk192m_div4_bf39293.zip

    Best regards,
    Marte

  • 0 in reply to Marte Myrvold

    I believe the fix the developers are working on to shut the WiFi interface down is exactly what we are looking for.

    I downloaded the patched QSPI driver, disabled logging, and built the included WiFi station code for the nRF7002 DK. The idle power consumption after disconnect with that sample is ~300uA. Significantly better, but not as good as if I compile out support for WiFi. 

    For our application we intend to connect to WiFi once every few hours and then disconnect and disable WiFi until it is time to connect again to ensure the longest battery life.

    I would be happy to test any patches related to shutting the WiFi down as soon as they are available.

    Thanks,

     

  • 0 in reply to bcornell

    Hi,

    I am glad to hear that the patch reduced the current consumption, and I have forwarded your findings to the developers.

    They are still working on a patch for the SDK, but I will let you know if there are any updates.

    Best regards,
    Marte

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