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Name
Description
Signal type
V
DDA
Equivalent to analog power supply of V
DD
and:
2.4V≤V
DDA
≤V
DD
(3.6V) during full-speed operation,
1.8V≤V
DDA
≤V
DD
(3.6V) during low-speed operation
Input, analog power
supply
V
REF-
Low-end/Negative reference voltage used by ADC, V
REF-
=V
SSA
Input, analog
reference negative
electrode
V
SSA
Equivalent to analog power supply of V
ss
Input, analog power
ground
ADCx_IN[15:0]
16 analog input channels
Analog input signal
ADC conversion mode
The product has multiple built-in ADC and channels (refer to the data manual for
the specific number), which can be combined into a variety of conversion
modes.
Multiple built-in ADC; according to the number of ADC, the conversion mode
can be classified into independent ADC mode and dual ADC mode; multiple
built-in channels, which can be classified into two groups, namely regular
channel and injected channel. The internal conversion mode of each group can
be divided into scan mode and discontinuous mode; for the internal channels of
each group, the conversion mode is divided into single conversion mode and
continuous conversion mode.
In the application, according to the actual application requirements, the number
of ADC, the number of conversion channels and the conversion mode of each
channel, the ADC conversion mode meeting the requirements can be designed.
Conversion mode of single ADC and single channel
Single ADC channel
Single ADC and single channel are not enabled by external trigger software.
The conversion mode is single and continuous concurrent disabling of scan.
The result of data conversion is right alignment. After the single ADC conversion
is completed, the interrupt is triggered, and data is read in the interrupt service
function, not using DMA transmission.
Single conversion mode
In this mode, for single channel, only one conversion is performed for this
channel, and for multiple channels, only one conversion is performed for this
group of channels .
This mode is started by the ADCEN bit of configuration register ADC_CTRL2 or
is started by external trigger.