STM32L100RC datasheet(24/104 Pages) STMICROELECTRONICS

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Functional overview

STM32L100RC

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DocID024995 Rev 4

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 (VREFINT)

The internal voltage reference (VREFINT) provides a stable (bandgap) voltage output for the

ADC and Comparators. VREFINT is internally connected to the ADC_IN17 input channel. It

enables accurate monitoring of the VDD value (when no external voltage, VREF+, is

available for ADC). The precise voltage of VREFINT is individually measured for each part by

ST during production test and stored in the system memory area. It is accessible in read-

only mode. See Table 14: Embedded internal reference voltage calibration values.

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