ADC input minimum current
ADC input minimum current
To use ADC attenuation I need to buffer the pins with voltage dividers. To minimise battery power and use highest resistances what is the minimum input current for an ESP32 analog input pin?
Re: ADC input minimum current
ADC input current will be neglible. However, to get the most accurate results from a high impedance source (like a high value voltage divider) you can add a small buffer capacitor (approx 100nF) between the ADC pin and ground.
Re: ADC input minimum current
Excellent, thanks
Re: ADC input minimum current
I have a similar problem, but not for ADC.
I need to detect the generation of very small current, through the transistor and optocoupler to form a simple detection circuit, output about 2uA logic level. Can ESP32 be confirmed with such a low current?
-
- Posts: 9715
- Joined: Thu Nov 26, 2015 4:08 am
Re: ADC input minimum current
Datasheet says input leakage is 50nA max, which is an order of magnitude smaller than the 2uA you have, so it should work.
Who is online
Users browsing this forum: No registered users and 315 guests