Need to put nrf in low power mode

[Karishma Jaiswal]

Hi,

We are using nrf52832 micro controller and our device is consuming about 14mA current right now.so i have 2 querries that 

1. How can we put our nrf into low power mode ?

2. How to check whether the nrf is in low power mode ?

Also we are gpio 25 as external interrupt to wake the device up which is connected to a motion sensor.

Thanks

[Jørgen Holmefjord]

Hi,

14mA is very high average current, and is normaly only seen when the radio is enabled in TX or RX mode. How are you measuring the current consumption? 

1. If the softdevice is enabled, you can enter system on sleep mode and system off deep sleep mode, using the functions sd_app_evt_wait and sd_power_system_off. If not using softdevice, you can use __WFE() and NRF_POWER->SYSTEMOFF = 1;
2. You should measure the current consumption, and compare this towards the current consumption in the various power modes. Note that other peripherals can be enabled, increasing the current consumption in sleep modes. If the chip is not in sleep mode, the CPU will be active and consumpe more than 3mA. 

Best regards,
Jørgen

 

[Karishma Jaiswal]

Hi
Thanks for your fast reply and i witnessed that my power is being consumed by other peripherals and not the nrf.
Also i was already using sd_app_evt_wait and _WFE( ) which was working fine and after removing most my other peripherals current was 0.1mA while in standby and 3.2mA when active, so culprit isnt nrf.

Thanks a lot.