When I Use dierct battery power without regulator

[JohnathanLyu]

Hi Community,

I have nrf51822 module and use it's ADC. I had 2 AAAA batterys to supply power. But found 3V regulator consumption over 100ua. It's too much with sleep mode.

So I curious without the regulator just directly use battery be power supply is that case ADC measure problem?

I use default ADC setting NRF_ADC_CONFIG_REF_VBG is reference voltage.

Could I just leave 3V regulator directly use battery source power and keep ADC right?

[JohnathanLyu]

Yes, I use external regulator drawing 100uA. I remove it. So directly use battery source in the working voltage (>2.4v and <3.6v) VBG is fixed 1.2v. Is ADC measure same value when power source become lower?