Adc (Analog-To-Digital Converter); Internal Voltage Reference; Refint ) - STMicroelectronics STM32L100RC Manual

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Functional overview
3.10

ADC (analog-to-digital converter)

A 12-bit analog-to-digital converters is embedded into STM32L100RC device with up to 20
external channels, performing conversions in single-shot or scan mode. In scan mode,
automatic conversion is performed on a selected group of analog inputs with up to 20
external channels in a group.
The ADC can be served by the DMA controller.
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.
An injection mode allows high priority conversions to be done by interrupting a scan mode
which runs in as a background task.
The ADC includes a specific low-power mode. The converter is able to operate at maximum
speed even if the CPU is operating at a very low frequency and has an auto-shutdown
function. The ADC's runtime and analog front-end current consumption are thus minimized
whatever the MCU operating mode.
3.10.1 Internal voltage reference (V
The internal voltage reference (V
ADC and Comparators. V
enables accurate monitoring of the V
available for ADC). The precise voltage of V
ST during production test and stored in the system memory area. It is accessible in read-
only mode. See
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REFINT
REFINT
is internally connected to the ADC_IN17 input channel. It
REFINT
DD
Table 14: Embedded internal reference voltage calibration
DocID024995 Rev 4
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)
) provides a stable (bandgap) voltage output for the
value (when no external voltage, VREF+, is
is individually measured for each part by
REFINT
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STM32L100RC
values.
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