STM32L552CC_V01 datasheet(63/340 Pages) STMICROELECTRONICS

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DS12737 Rev 6

63/340

STM32L552xx

Functional overview

3.22

Digital to analog converter (DAC)

Two 12-bit buffered DAC channels can be used to convert digital signals into analog voltage

signal outputs. The chosen design structure is composed of integrated resistor strings and

an amplifier in inverting configuration.

This digital interface supports the following features:

•

Up to two DAC output channels

•

8-bit or 12-bit output mode

•

Buffer offset calibration (factory and user trimming)

•

Left or right data alignment in 12-bit mode

•

Synchronized update capability

•

Noise-wave generation

•

Triangular-wave generation

•

Dual DAC channel independent or simultaneous conversions

•

DMA capability for each channel

•

External triggers for conversion

•

Sample and hold low-power mode, with internal or external capacitor

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

to different DMA channels.

3.23

Voltage reference buffer (VREFBUF)

The devices embed a voltage reference buffer which can be used as voltage reference for

ADC, DACs and also as voltage reference for external components through the VREF+ pin.

The internal voltage reference buffer supports two voltages:

•

2.048 V

•

2.5 V

An external voltage reference can be provided through the VREF+ pin when the internal

voltage reference buffer is off.

The VREF+ pin is double-bonded with VDDA on some packages. In these packages the

internal voltage reference buffer is not available.

Figure 9. Voltage reference buffer

MSv40197V1

VREFBUF

Low frequency

cut-off capacitor

DAC, ADC

Bandgap

VDDA

100 nF

VREF+

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