ESP8266 ADC: overvoltage protection

RedBaron
Posts: 2
Joined: Sat Jan 07, 2017 12:48 am

ESP8266 ADC: overvoltage protection

Postby RedBaron » Sat Jan 07, 2017 12:54 am

What is the max. voltage you can apply to the ADC (TOUT, Pin 6) without destroying the ESP8266. Is there an internal clipinng like a diode?

Kind regards

ESP_Xutao
Posts: 134
Joined: Tue Sep 27, 2016 5:42 pm

Re: ESP8266 ADC: overvoltage protection

Postby ESP_Xutao » Mon Jan 09, 2017 8:15 pm

Hi:
The Voltage range is 0 to 1V.

RedBaron
Posts: 2
Joined: Sat Jan 07, 2017 12:48 am

Re: ESP8266 ADC: overvoltage protection

Postby RedBaron » Thu Feb 02, 2017 12:22 am

Hi,

that's true, but not the answer to the question. The nominal range is well documented in the datasheet and i know them. The maximum values are not documented.

What are the maximum values you can apply without destroying the chip?

In my project it might be that there are about 2.5V. I will add two diodes for clipping this voltage. The result is 1.4 V. Naturally this will give no valid reading, but does it destroy the chip? What about -0.3V using a Schottky diode for clipping negative voltages?

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