Analog-to-digital converter (ADC)
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13
Analog-to-digital converter (ADC)
This section applies to the whole STM32F4xx family, unless otherwise specified.
13.1 ADC
introduction
The 12-bit ADC is a successive approximation analog-to-digital converter. It has up to 19
multiplexed channels allowing it to measure signals from 16 external sources, two internal
sources, and the V
BAT
channel. The A/D conversion of the channels can be performed in
single, continuous, scan or discontinuous mode. The result of the ADC is stored into a left-
or right-aligned 16-bit data register.
The analog watchdog feature allows the application to detect if the input voltage goes
beyond the user-defined, higher or lower thresholds.
13.2
ADC main features
•
12-bit, 10-bit, 8-bit or 6-bit configurable resolution
•
Interrupt generation at the end of conversion, end of injected conversion, and in case of
analog watchdog or overrun events
•
Single and continuous conversion modes
•
Scan mode for automatic conversion of channel 0 to channel ‘n’
•
Data alignment with in-built data coherency
•
Channel-wise programmable sampling time
•
External trigger option with configurable polarity for both regular and injected
conversions
•
Discontinuous mode
•
Dual/Triple mode (on devices with 2 ADCs or more)
•
Configurable DMA data storage in Dual/Triple ADC mode
•
Configurable delay between conversions in Dual/Triple interleaved mode
•
ADC conversion type (refer to the datasheets)
•
ADC supply requirements: 2.4 V to 3.6 V at full speed and down to 1.8 V at slower
speed
•
ADC input range: V
REF
–
≤
V
IN
≤
V
REF+
•
DMA request generation during regular channel conversion
shows the block diagram of the ADC.
Note:
V
REF–
, if available (depending on package), must be tied to V
SSA
.
