nRF52840 UART current high problem is discussed again

RE: nRF52840 UART current high problem is discussed again

Vidar Berg — Mon, 30 Sep 2024 09:19:16 GMT

It could be that the bootloader is enabling the UART but not properly disabling it before branching to the main app. Do you see the same if you set CONFIG_SERIAL=n in your bootloader build?

RE: nRF52840 UART current high problem is discussed again

PabloL — Fri, 27 Sep 2024 19:31:38 GMT

[quote userid="4240" url="~/f/nordic-q-a/114092/nrf52840-uart-current-high-problem-is-discussed-again/499210"]EDIT: Is the application tested with out without a bootloader present? [/quote]

Hi, I have a higher current when I enable the bootloader in my board, let me ask: why did you ask that?

RE: nRF52840 UART current high problem is discussed again

Vidar Berg — Wed, 21 Aug 2024 12:46:06 GMT

Hello,

It should be sufficient to run the UART suspend action (pm_device_action_run(<uart dev>, PM_DEVICE_ACTION_SUSPEND) to make the driver execute the power-down sequence here: https://github.com/nrfconnect/sdk-zephyr/blob/7ccc1a41bc4c27c73bb03f01ed6b05491ba5872d/drivers/serial/uart_nrfx_uarte.c#L1868. The implemenetation follows the sequence documented in the product specification here: Low power

Have you tried measuring the current consumption when the UART instances are disabled by setting CONFIG_SERIAL to '=n' for comparison?

Best regards,

Vidar

EDIT: Is the application tested with out without a bootloader present?