Hello Everybody,
I wonder if anybody knows the current consumption of the ADC, How much will it burn for getting 1 sample?
This is for NRF51828a
Thanks for your help.
Mohamed O.Abouzeid
Hello Everybody,
I wonder if anybody knows the current consumption of the ADC, How much will it burn for getting 1 sample?
This is for NRF51828a
Thanks for your help.
Mohamed O.Abouzeid
I don't have an nRF51822 to hand (I assume you mean that chip) but I found these pages
https://devzone.nordicsemi.com/f/nordic-q-a/13907/adc-consumption which gives a mA value for a particular scenario.
https://devzone.nordicsemi.com/b/blog/posts/measuring-lithium-battery-voltage-with-nrf51 which gives a nicely detailed approach to reading the battery voltage.
From a theoretical point of view, the nRF51822 Product Specifcation v3.3 ( http://infocenter.nordicsemi.com/pdf/nRF51822_PS_v3.3.pdf ) section ' 8.12 Analog to Digital Converter (ADC) specifications' shows an 8-bit ADC sample takes 20 us, 10-bit ADC sample takes 68 us and the ADC power is 260 uA so combining those with your voltage will give a rough power consumption just for the ADC (ignoring having the core waking up etc.)
Don't forget the clock. ADC needs HFCLK or HFINT running, which consumes additional current if it was not active otherwise.