diff --git a/docs/api-reference/peripherals/adc.rst b/docs/api-reference/peripherals/adc.rst index fa6a6497c9..3ac2b17543 100644 --- a/docs/api-reference/peripherals/adc.rst +++ b/docs/api-reference/peripherals/adc.rst @@ -6,7 +6,7 @@ Overview ESP32 integrates two 12-bit SAR (`Successive Approximation Register `_) ADCs (Analog to Digital Converters) and supports measurements on 18 channels (analog enabled pins). Some of these pins can be used to build a programmable gain amplifier which is used for the measurement of small analog signals. -The ADC driver API supports ADC1 (9 channels, attached to GPIOs 32 - 39), and ADC2 (10 channels, attached to GPIOs 0, 2, 4, 12 - 15 and 25 - 27). +The ADC driver API supports ADC1 (8 channels, attached to GPIOs 32 - 39), and ADC2 (10 channels, attached to GPIOs 0, 2, 4, 12 - 15 and 25 - 27). However, there're some restrictions for the application to use ADC2: 1. The application can use ADC2 only when Wi-Fi driver is not started, since the ADC is also used by the Wi-Fi driver, which has higher priority.