STM32U545NET3QTR datasheet(61/283 Pages) STMICROELECTRONICS

61 / 283 page

DS14216 Rev 1

61/283

STM32U545xx

Functional overview

3.26

Digital to analog converter (DAC)

The DAC module is a 12-bit, voltage output digital-to-analog converter. The DAC can be

configured in 8- or 12-bit mode and may be used in conjunction with the DMA controller.

In 12-bit mode, the data may be left- or right-aligned.

The DAC features two output channels, each with its own converter. In dual DAC channel

mode, conversions can be done independently or simultaneously when both channels are

grouped together for synchronous update operations. An input reference pin, VREF+

(shared with others analog peripherals) is available for better resolution. An internal

reference can also be set on the same input.

The DAC_OUTx pin can be used as general purpose input/output (GPIO) when the DAC

output is disconnected from output pad and connected to on chip peripheral. The DAC

output buffer can be optionally enabled to allow a high drive output current. An individual

calibration can be applied on each DAC output channel. The DAC output channels support

a low-power mode, the sample and hold mode.

The digital interface supports the following features:

•

One DAC interface, maximum two output channels

•

Left or right data alignment in 12-bit mode

•

Synchronized update capability

•

Noise-wave and triangular-wave generation

•

Sawtooth wave generation

•

Dual DAC channel for independent or simultaneous conversions

•

DMA capability for each channel including DMA underrun error detection

•

Double data DMA capability to reduce the bus activity

•

External triggers for conversion

•

DAC output channel buffered/unbuffered modes

•

Buffer offset calibration

•

Each DAC output can be disconnected from the DAC_OUTx output pin

•

DAC output connection to on chip peripherals

•

Sample and hold mode for low-power operation in Stop mode. The DAC voltage can

be changed autonomously with the DMA while the device is in Stop mode.

•

Autonomous mode to reduce the power consumption for the system

•

Voltage reference input

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