nrf9160 SPI power consumption

[Tron]

Hi

On my custom board, I have an external flash connected via SPI. . The nrf runs on mfw 1.1.0. 

Without activating the flash, I get an average current consumption of around 45 µA. As soon as i do a spi_transcieve(...) call, the power consumtion jumps up till 1,4 mA, and will not go down again during sleep. This current corresponds exactly to what I see if serial communication is enabled. I don't know if this is relevant or not. 

The flash is powered down, and should in a ready state draw around 25µA.

Yours, 

Tron

[Tron]

Check out the comment on line 55, is this fixed now?

Tron

[Tron]

I've tested, and still see 1.5mA. Please verify that you have checked out the develop branch, and that LIFO_ENABLED is defined. 

[Simon]

I am not in the office right now and I'm not able to test this. I will measure it again tomorrow.

Best regards,

Simon

[Simon]

I tested your application on the developer branch along with NCS v1.1.0.

Try disabling the serial logging from mcuboot. It decreased the current consumption from 1.2mA to 85.8uA when I did it. It can be achieved by doing the following:

• Add the following piece of code to your projects CMakeList.txt (nrftracker\CMakeLists.txt)

set(mcuboot_CONF_FILE
	prj.conf
    ${CMAKE_CURRENT_LIST_DIR}/mcuboot.conf
    )

• Create the file nrftracker\mcuboot.conf with the following content:

CONFIG_SERIAL=n

• run west build -b nrf9160_pca10090ns
• Check if CONFIG_SERIAL is present in \nrftracker\build\mcuboot\zephyr\include\generated\autoconf.h
  • If it is, then something went wrong
• Run nrfjprog --eraseall 
• Run west flash
• Reset your chip and measure the current

Best regards,

Simon

[Tron]

I've done everything according to recommendations. I've tried programming the device directly with nrfjprog (or more precisely nrf91_jflash.exe), as well as through segger and nrfjprog. I have built using segger ide, as well as west. Still, no changes in current consumption. I'm trying with another card now .