RE: 52840 idle current consumption

KentOverton — Fri, 11 Oct 2024 15:30:55 GMT

These issues were all board manufacturing issues. I'm going to cose the ticket

RE: 52840 idle current consumption

Vidar Berg — Tue, 13 Aug 2024 12:44:24 GMT

Hi,

Are the external modules on your board included in the measurement? I tried repeating your current measurements with a nRF52840 DK, but was unable to reproduce the same results.

Example 1/2

Without UART enabled

UART enabled

Example 3/4

I see the opposite behavior when measuring on my nRF52840 DK. That is, the sleep current is around 4 µA when using example 4 where the pins are not reconfigured, and 160 uA when using example 3, where the pin configurations are not commented. This suggests there may be leakage on one or more pins. The leakage could also be coming from the external circuitry if everything is connected to the same power rail.

Pin configuration example 4

Example 5

The examples were all build for your Homesmart board. The only change I made was to add

include(${ZEPHYR_BASE}/boards/common/nrfjprog.board.cmake)

to allow debugging with the nrfjprog west flash runner.

Best regards,

Vidar

EDIT:

[quote user=""]ALso note that I've tried to use power management on the I2S port. When I try to suspend the device, Zephyr returns a -88 - Feature not supported.[/quote]

The i2s driver does not implement PM support, hence the -88 error. But the i2s peripheral should enter idle automatically after transactions are complete. Is the i2c receiver on your board power gated and can it be powered off in the idle periods?

RE: 52840 idle current consumption

KentOverton — Mon, 12 Aug 2024 14:43:44 GMT

devzone.nordicsemi.com/.../NordicQuestion.zip

Here is the zip file.