power consumption

[MALI MAYUR]

hello everyone ...I am working on a project that uses the nRF52840 IC. I would like to implement a power-down mode to reduce power consumption. In my project, I am using BLE, ADC, RTC, and UART. Could you please let me know how many power-down options are available and suggest the best possible method for achieving low power consumption?

 

[Kenneth]

Hi,

If you haven't already, get yourself an Nordic PPK II that you can use to measures current consumption in real-time.

Normally a peripheral will only use current when active, e.g. actively receiving or transmitting. So depending on how often the application read or write to a peripheral it will use current during that period of time, if there is no specific activity, then it will run on RTC to maintain timing and ensure it can wakeup, during this idle period the current consumption should be 3uA.

Kenneth

[MALI MAYUR]

I have implemented BLE, ADC, RTC, and UART. After that, my power consumption is around 1.34 mA. Can you suggest possible ways to reduce power consumption or enter low-power modes?

[Kenneth]

Hi,

In general check out this one:
https://docs.nordicsemi.com/bundle/ncs-latest/page/nrf/test_and_optimize/optimizing/power_general.html#disable_serial_logging

I suspect UART, because if you are in RX mode with UART, that will continuously draw about ~1mA.

Kenneth

[MALI MAYUR]

ble_app_uart_optimize.zip

I have a ZIP file with my code. Could you please review it and suggest any changes to reduce power consumption?

 

[Kenneth]

I can see now you are working on the nRF5 SDK. In that case it should be fairly easy to comment out the functions you have to find which function call cause the current. Do make sure you are power cycling the board before measuring current, to ensure it's not in debug mode due to programming the firmware.

Kenneth