UM0306 Analog/digital converter (ADC)
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19 Analog/digital converter (ADC)
19.1 Introduction
The 12-bit ADC is a successive approximation Analog to Digital Converter. It has up to 18
multiplexed channels allowing it measure signals from 16 external and two internal sources.
A/D Conversion of the various channels can be performed in single, continuous, scan or
discontinuous mode. The result of the ADC is stored in a left-aligned or right-aligned 16-bit
data register.
The Analog Watchdog feature allows the application to detect if the input voltage goes
outside the user-defined high or low thresholds.
19.2 Main features
● 12-bit resolution
● Interrupt generation at End of Conversion, End of Injected conversion and Analog
Watchdog event
● Single and continuous conversion modes
● Scan mode for automatic conversion of channel 0 to channel ‘n’
● Self-calibration
● Data alignment with in-built data coherency
● Channel by channel programmable sampling time
● External trigger option for both regular and injected conversion
● Discontinuous mode
● Dual mode (on devices with 2 ADCs)
● ADC conversion rate 1 MHz
● ADC supply requirement: 2.4V to 3.6V
● ADC input range: V
REF-
≤ V
IN
≤ V
REF+
●
DMA request generation during regular channel conversion
The block diagram of the ADC is shown in Figure 166.
Note: V
REF-
,if available (depending on package), must be tied to VSSA.
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