STM32L100RB datasheet(24/103 Pages) STMICROELECTRONICS

24 / 103 page

Functional overview

STM32L100C6 STM32L100R8/RB

24/103

DocID024295 Rev 5

3.10

ADC (analog-to-digital converter)

A 12-bit analog-to-digital converters is embedded into STM32L100C6 and

STM32L100R8/RB devices 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.

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 selected 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 trigger and injection trigger, 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. 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 15: Embedded internal reference voltage.

3.11

DAC (digital-to-analog converter)

The two 12-bit buffered DAC channels can be used to convert two digital signals into two

analog voltage signal outputs. The chosen design structure is composed of integrated

resistor strings and an amplifier in non-inverting configuration.

This dual digital Interface supports the following features:

•

two DAC converters: one for each output channel

•

left or right data alignment in 12-bit mode

•

synchronized update capability

•

noise-wave generation

•

triangular-wave generation

•

dual DAC channels’ independent or simultaneous conversions

•

DMA capability for each channel (including the underrun interrupt)

•

external triggers for conversion

Eight DAC trigger inputs are used in the STM32L100C6 and STM32L100R8/RB devices.

The DAC channels are triggered through the timer update outputs that are also connected

to different DMA channels.

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