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?

[Marte Myrvold]

Hi,

You can enable low power mode for QSPI by setting CONFIG_NRF700X_QSPI_LOW_POWER=y. This should reduce the consumption significantly. 

Best regards,
Marte

[bcornell]

Hello,

I have added CONFIG_NRF700X_QSPI_LOW_POWER=y to prj.conf for the peripheral_lbs sample and did not see any reduction in power consumption.

[Marte Myrvold]

Hi,

I have been out of the office.

I have asked the development team about this issue, and I will update you when I get a response.

Best regards,
Marte

[Marte Myrvold]

Hi,

It could be related to this fix missing in the Wi-Fi QSPI handling:

https://github.com/nrfconnect/sdk-zephyr/blob/v3.3.99-ncs1/drivers/flash/nrf_qspi_nor.c#L277

NRF_QSPI hardware module must be set in a lower clocked mode when in idle to achieve uA sleep range.

Best regards,
Marte

[bcornell]

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.