Datasheet

DS12323 Rev 2 23/91
STM32L010F4/K4 Functional overview
28
frequencies (~25 µA at 10 ksps, ~200 µA at 1 Msps). An auto-shutdown function
guarantees that the ADC is powered off except during the active conversion phase.
The ADC can be served by the DMA controller.
The ADC features a hardware oversampler up to 256 samples, this improves the resolution
to 16 bits. See the application note Improving STM32F1x and STM32L1x ADC resolution by
oversampling (AN2668).
An analog watchdog feature allows very precise monitoring of the converted voltage of one,
some or all scanned channels. An interrupt is generated when the converted voltage is
outside the programmed thresholds.
The events generated by the general-purpose timers (TIMx) can be internally connected to
the ADC start triggers, to allow the application to synchronize A/D conversions and timers.
3.11 Internal voltage reference (V
REFINT
)
The internal voltage reference (V
REFINT
) provides a stable (bandgap) voltage output for the
ADC. V
REFINT
is internally connected to the ADC_IN17 input channel. It enables accurate
monitoring of the V
DD
value (since no external voltage, V
REF+
, is available for ADC). The
precise voltage of V
REFINT
is individually measured for each part by ST during production
test and stored in the system memory area (see Table 17: Embedded internal reference
voltage calibration values). It is accessible in read-only mode.
Reference voltage
The internal reference voltage is available externally via a low-power / low-current output
buffer (driving current capability of 1 µA typical).
3.12 System configuration controller
The system configuration controller provides the capability to remap some alternate
functions on different I/O ports.
The highly flexible routing interface allows the application firmware to control the routing of
different I/Os to the TIM2, TIM21 and LPTIM1 timer input captures. The system
configuration controller also controls the routing of internal analog signals to the ADC and
the internal reference voltage V
REFINT
.
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