high current consumption of nrf 5340 with 7002

RE: high current consumption of nrf 5340 with 7002

Kazi Afroza Sultana — Tue, 28 May 2024 16:38:53 GMT

Hello,

I have replied here (+) Nordic DevZone (nordicsemi.com). I can see the duplicate case. You can close the new one?

RE: high current consumption of nrf 5340 with 7002

allenyang — Thu, 23 May 2024 08:13:52 GMT

I've found something strange,

in the datasheet, it says when "buck_en" is de-assertion, it will shutdown 7002, and when it's assertion, it will be active or sleep mode.

but when I set logic low(active high), it's 90ma(Helloworld sample),

and when I set logic high(active high), it's 9ma(Helloworld sample).

and I've test WIFI Scan sample,

when I set low it is failed to open wifi (it is correct because 7002 is shutdown),

when I set high the sample works normally(50ma when scanning, 2ma when idle)

What's the reason of this, is it a hardware or a software problem?

RE: high current consumption of nrf 5340 with 7002

allenyang — Wed, 15 May 2024 06:38:03 GMT

I read the nrf7002 datasheet and found that there is a pin, buck_en, that can be control to shutdown nrf7002 ,when I set the signal to 1, the current becomes 9ma, it seems the current is much more normal.

But can the current be much lower? I've disabled all the devicetree pin, and only print "Hello world" in the application.

Did I disable it not correctly? I just changed the status = "okay" to status = "disabled".

RE: high current consumption of nrf 5340 with 7002

allenyang — Fri, 10 May 2024 09:30:23 GMT

Hi,

I noticed that the current is possibly changed after rebooting the board, so it’s sometimes 90ma, and sometime 20ma. But I don,t know why this happened.

”You can check the pin states of the nRF7002 to ensure that it is in shutdown state.”

which pin should I check?

“Does the problem occur for only one board or for several boards?”

It seems several boards because I’ve tried two boards.

RE: high current consumption of nrf 5340 with 7002

Kazi Afroza Sultana — Fri, 10 May 2024 05:33:59 GMT

Hello,

Sorry for the late reply. I have talked to the team. Have you checked the pin state?

You can check the pin states of the nRF7002 to ensure that it is in shutdown state. Does the problem occur for only one board or for several boards?

RE: high current consumption of nrf 5340 with 7002

allenyang — Thu, 09 May 2024 02:26:07 GMT

Can anyone answer me?

RE: high current consumption of nrf 5340 with 7002

allenyang — Thu, 25 Apr 2024 02:56:41 GMT

Hi, can it cause by power management ?

Because I didn't add any of it .

And I want to know what the normal current will be when hello world sample is running using nrf5340 with 7002, and when it is in the idle state ?

thanks

RE: high current consumption of nrf 5340 with 7002

allenyang — Mon, 22 Apr 2024 06:06:28 GMT

#config RTT
CONFIG_LOG=y
CONFIG_LOG_PRINTK=y
# CONFIG_LOG_MODE_DEFERRED=y
CONFIG_UART_CONSOLE=n
CONFIG_USE_SEGGER_RTT=y
CONFIG_RTT_CONSOLE=y
CONFIG_LOG_BACKEND_RTT=y
CONFIG_LOG_BACKEND_UART=n

CONFIG_SEGGER_RTT_BUFFER_SIZE_UP=4096
CONFIG_LOG_BUFFER_SIZE=4096

# Disable internal DCDC
CONFIG_BOARD_ENABLE_DCDC_APP=n
CONFIG_BOARD_ENABLE_DCDC_NET=n
CONFIG_BOARD_ENABLE_DCDC_HV=n

# Use internal capacitor for 32M xtal and set capacitor value to 8.5pF 
# (ranging from 7.0 pF to 20.0 pF in 0.5 pF steps
# can be enabled on pins XC1 and XC2. This option specifies doubled
# capacitance value for the two capacitors. Set it to 14 to get 7.0 pF
# for each capacitor, 15 to get 7.5 pF, and so on.
# )
CONFIG_SOC_HFXO_CAP_INTERNAL=y
CONFIG_SOC_HFXO_CAP_INT_VALUE_X2=17
 
#  Use internal capacitor for 32k xtal and set capacitor value to 7pF 
# (only 4 options of internal capacitor value settings for 32k xtal
#   -INT_6PF
#   -INT_7PF
#   -INT_9PF
#   - USE external capacitor)
CONFIG_SOC_ENABLE_LFXO=y
CONFIG_SOC_LFXO_CAP_INT_7PF=y

Hi, I only added the RTT config and disabled dcdc.

RE: high current consumption of nrf 5340 with 7002

Kazi Afroza Sultana — Fri, 19 Apr 2024 10:14:03 GMT

Hello,

You are getting very high current. How have you measured the current? how does the project config file look like?