Regrading Sleep current in nrf52840

[Santhosh_123]

Hi Team,

we have one doubt regarding sleep current when we try to measure with power analyzer(nrf52840 EVM Board) .we got 5.23 micro amps instead of 2.35 micro amps.

we used this example code D:\santhosh\Penny\nrf52840\nrf-NRF52840\nRF5_SDK_17.1.0_ddde560\nRF5_SDK_17.1.0_ddde560\examples\peripheral\ram_retention for current measurement can you help regarding this so it will be so helpful for our team

[Kazi Afroza Sultana]

Hello, 

I need the picture of your set up, board details. 

You can build the example app_ble_pwr_profiling from \nRF5SDK\17_0_2\d674dde\examples\ble_peripheral\ble_app_pwr_profiling in SDK 17. It should measure 0.3-0.4 uA. If it does so then we know  that the setup is ok. 

BR

Kazi 

[Santhosh_123]

Hi kazi,

Thank you for your reply,Yeah for this   \nRF5SDK\17_0_2\d674dde\examples\ble_peripheral\ble_app_pwr_profiling

we are getting 0.3 uA then i think setup is of But

we want to measure the sleep current  for this specification 

ION_RAMON_EVENT System ON, full 256 kB RAM retention, wake on any event 2.35 μA

any example code is there for this?

[Kazi Afroza Sultana]

Hello Santhosh,

The example code will be like this - 

void main(void) {

for(;;) {

void main(void){ for(;;){

__WFE();

}

}

When we are talking about RAM retention, we mean that the RAM is retained when the chip is in System OFF mode. But when the system is ON, all RAM is always retained (powered on) unless explicitly power down in code. So basically the above code put the CPU in sleep mode (WFE = Wait For Event). 

Best Regardds,

Kazi Afroza Sultana