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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  

Reply
  • 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  

Children
  • 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 

  • 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 

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