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How to get low current consumption nrf52840

user109511

HI

I am using this sequence functions in  my main loop for low current consumption

__SEV();  __WFE(); __WFE(); 

normally I have 13mA  in my application  when I am using those functions my current is 7.8 mA

but the velocity process get down in my main loop , using 

__SEV();  __WFE(); __WFE(); 

 for (;;)//main loop
    {
			 
          __SEV();  __WFE(); __WFE(); 
			
			caida_init();
			idle_state_handle();
			turnOnLed();
    }
  

how can I to fix that?, 

or what can I use to replace it?

is the RTOS a possible solution?

thanks and reagrds

Parents
  • 0

    Hi there,

    7 mA in sleep is a lot. Are you using a custom board or a development kit? There is no need to call __SEV(), WFE(), WFE() and idle_state_handle() as they effectively do the same.

    regards

    Jared 

  • 0 in reply to user73165

    HI Jared

    Not really, I am using a generic module (BAST), the 7mA  is current from ICM-20948(gyroscope and accelerometer) then 0.8 to 1mA is possibly of module , i am no sure. 

    I am using different sensor devices , SSD1306(spi), MAX30101(I2C),ICM20948(I2C), 

    ICM20948 and BLE is always turn on,  normally ssd1306 and max30101 is shutdown,    

    if i dont use  __SEV(), WFE(), WFE(); the consumption is 13 mA with the module and ICM20948 turn on , then i have no idea why , in my application i need the ICM always turn on,

    I saw this guide "current consumption guide" but I don't have results 

    do you have other guide ? or example ?

    thanks and regards  

  • 0 in reply to user109511

    Hi,

    We have this guide for the nRF52 series. 

    Marcos Tadeo said:
    ICM20948 and BLE is always turn on,  normally ssd1306 and max30101 is shutdown,    

    Are you advertising/scanning or in a connection?

    What do you measure if you flash the chip with the unmodified ble_app_beacon example from the SDK?

    regards

    Jared 

Reply
  • 0 in reply to user109511

    Hi,

    We have this guide for the nRF52 series. 

    Marcos Tadeo said:
    ICM20948 and BLE is always turn on,  normally ssd1306 and max30101 is shutdown,    

    Are you advertising/scanning or in a connection?

    What do you measure if you flash the chip with the unmodified ble_app_beacon example from the SDK?

    regards

    Jared 

Children
  • 0 in reply to user73165

    HI,

    i am using ble_app_uart example , the ICM20948 is a fall detect application and I send a message by BLE when fall is detected 

    I am using both scanning and connection BLE, nrf_calendar also, 

    we detected possibly ICM20948 is the problem, because, I tested  ble app uart example with two buttons ,

    the buttons send a message over NUS, and the consumption was 1.3 mA  avg, the icm20948 manufacturer in their data sheet says the current consumption should be 1.26mA   , I measure the device and the consumption was 7mA, I will check your guide , and test again 

    thanks and regards

    sorry my English is not good

  • 0 in reply to user109511

    Hi again

    the icm 20948 consumption is 7mA

    the module nrf52 3.1 mA, if i use the sequense  __SEV(), WFE(), WFE();  the current is .8mA but the process i little bit  slow 

  • 0 in reply to user109511

    Hi,

    Do you have a nRF52 development kit that you can test application on? How do you differentiate the current consumed by the nRF52 and the ICM 20948?

    Marcos Tadeo said:

    i am using ble_app_uart example , the ICM20948 is a fall detect application and I send a message by BLE when fall is detected 

    I am using both scanning and connection BLE, nrf_calendar also, 

    we detected possibly ICM20948 is the problem, because, I tested  ble app uart example with two buttons ,

    the buttons send a message over NUS, and the consumption was 1.3 mA  avg, the icm20948 manufacturer in their data sheet says the current consumption should be 1.26mA   , I measure the device and the consumption was 7mA, I will check your guide , and test again 

    1.2 mA avg current for unmodified ble_app_uart is high. Can you test unmodified ble_app_beacon example too?

    regards

    Jared 

  • 0 in reply to user73165

    HI jared 

    I tested ble_app_beacon example , and the consumption was 0.3mA thats good, i am using ble_app_uart example, what is the diference? because i tested  ble_app_uart with two gpiote interrupts I am not using the serial port tx and rx,  only to receive messages over NUS , and the consumption was 1.2mA, do I need to disable  something? is my firts time using nrf52840 xd

    regards 

  • 0 in reply to user109511

    Hi,

    The ble_app_uart example has not been power optimized. If you want to decrease current consumption, then you can adjust the advertising parameters such as the increasing the advertising interval and decreasing the TX power, you could also turn off the logger module. Here is a thread that sum up some suggestions for decreasing the current consumption for the ble_app_uart example. 

    regards

    Jared 

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