ADC CURRENT CONSUMPTION IS 3 TO 4mA, even in datasheet it is 700uA

[Embel_Tech]

Hello,

I m using nRF 52832 with SDK 15.0.0  .

when i m measuring current for adc it showing about 3-4 mA .

but from datasheet of nrf52832 its showing 700 uA .

my code steps are:

                                saadc_init(); // SAR adc initialisation_Channel 0_12bit resolution_VDD as input.
                                nrf_saadc_value_t adc_val;
                                nrfx_saadc_sample_convert(0,&adc_val);
                                nrf_delay_ms(5000);      // added for current measurement
                                nrfx_saadc_uninit();

Let me know what is an issue??//?

[Jared]

Hi there,

How are you measuring the current?

Can you try to call nrfx_saadc_abort(), and wait for NRFX_SAADC_EVT_DONE event before you call nrfx_saadc_uninit()?

regards

Jared 

[Embel_Tech]

YES.

As i am measuring current by multimeter with below function, delay is added here to capture current value on multimeter.

                                 saadc_init(); // SAR adc initialisation_Channel 0_12bit resolution_VDD as input.
                                nrf_saadc_value_t adc_val;
                                nrfx_saadc_sample_convert(0,&adc_val);
                                nrf_delay_ms(5000);      // added for current measurement
                                nrfx_saadc_uninit();

I also tried nrfx_saadc_abort(), and wait for NRFX_SAADC_EVT_DONE  .

but getting same  current about 3- 4mA.

[Jared]

Hi,

Why would you need to add the delay to measure the current? What does the current change to if you remove the delay?

Can you share a pre compiled hex that I can flash to my nRF52 development kit so I can verify the measurement. 

regards
Jared

[Embel_Tech]

Actually power profiler is not with us.so we are measuring  current through multimeter itself. 

[Embel_Tech]

saadc_lowpower.hex

I have attached hex file for your reference. Please check it.