ADC input attenuation

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

ADC input attenuation

Postby Pibbotley » Fri Feb 16, 2018 9:17 pm

The ADC pin input voltage measurement can be attenuated, e.g 6db reduces it to around 2.2V according to
http://esp-idf.readthedocs.io/en/latest ... dc_atten_t

But is the pin still 3.3V tolerant?

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ESP_krzychb
Posts: 394
Joined: Sat Oct 01, 2016 9:05 am
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Re: ADC input attenuation

Postby ESP_krzychb » Sat Feb 17, 2018 6:18 am

Hi Pibbotley,

Setting of ADC attenuation does not make the voltage pin rating worse.
You can still apply 3.3V to a pin at 6db attenuation, the ADC readings will only saturate.

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

Re: ADC input attenuation

Postby Pibbotley » Sat Feb 17, 2018 9:27 am

Thanks

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