ADC input minimum current

Pibbotley
Posts: 45
Joined: Fri Feb 16, 2018 7:06 pm

ADC input minimum current

Postby Pibbotley » Sun Feb 18, 2018 7:35 pm

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?

ESP_Angus
Posts: 2344
Joined: Sun May 08, 2016 4:11 am

Re: ADC input minimum current

Postby ESP_Angus » Mon Feb 19, 2018 6:22 am

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.

Pibbotley
Posts: 45
Joined: Fri Feb 16, 2018 7:06 pm

Re: ADC input minimum current

Postby Pibbotley » Mon Feb 19, 2018 9:28 am

Excellent, thanks

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