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diff --git a/watch-library/hal/documentation/adc_sync.rst b/watch-library/hal/documentation/adc_sync.rst deleted file mode 100644 index d189565a..00000000 --- a/watch-library/hal/documentation/adc_sync.rst +++ /dev/null @@ -1,74 +0,0 @@ -====================== -ADC Synchronous driver -====================== - -An ADC (Analog-to-Digital Converter) converts analog signals to digital values. -A reference signal with a known voltage level is quantified into equally -sized chunks, each representing a digital value from 0 to the highest number -possible with the bit resolution supported by the ADC. The input voltage -measured by the ADC is compared against these chunks and the chunk with the -closest voltage level defines the digital value that can be used to represent -the analog input voltage level. - -Usually an ADC can operate in either differential or single-ended mode. -In differential mode two signals (V+ and V-) are compared against each other -and the resulting digital value represents the relative voltage level between -V+ and V-. This means that if the input voltage level on V+ is lower than on -V- the digital value is negative, which also means that in differential -mode one bit is lost to the sign. In single-ended mode only V+ is compared -against the reference voltage, and the resulting digital value can only be -positive, but the full bit-range of the ADC can be used. - -Usually multiple resolutions are supported by the ADC, lower resolution can -reduce the conversion time, but lose accuracy. - -Some ADCs has a gain stage on the input lines which can be used to increase the -dynamic range. The default gain value is usually x1, which means that the -conversion range is from 0V to the reference voltage. -Applications can change the gain stage, to increase or reduce the conversion -range. - -The window mode allows the conversion result to be compared to a set of -predefined threshold values. Applications can use callback function to monitor -if the conversion result exceeds predefined threshold value. - -Usually multiple reference voltages are supported by the ADC, both internal and -external with difference voltage levels. The reference voltage have an impact -on the accuracy, and should be selected to cover the full range of the analog -input signal and never less than the expected maximum input voltage. - -There are two conversion modes supported by ADC, single shot and free running. -In single shot mode the ADC only make one conversion when triggered by the -application, in free running mode it continues to make conversion from it -is triggered until it is stopped by the application. When window monitoring, -the ADC should be set to free running mode. - -Features --------- -* Initialization and de-initialization -* Support multiple Conversion Mode, Single or Free run -* Start ADC Conversion -* Read Conversion Result - -Applications ------------- -* Measurement of internal sensor. E.g., MCU internal temperature sensor value. -* Measurement of external sensor. E.g., Temperature, humidity sensor value. -* Sampling and measurement of a signal. E.g., sinusoidal wave, square wave. - -Dependencies ------------- -* ADC hardware - -Concurrency ------------ -N/A - -Limitations ------------ -N/A - -Knows issues and workarounds ----------------------------- -N/A - |