STM32H757AI datasheet(36/251 Pages) STMICROELECTRONICS

36 / 251 page

Functional overview

STM32H757xI

36/251

DS12931 Rev 1

3.20

Digital-to-analog converters (DAC)

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

analog voltage signal outputs.

This dual digital Interface supports the following features:

•

two DAC converters: one for each output channel

•

8-bit or 12-bit monotonic output

•

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 including DMA underrun error detection

•

external triggers for conversion

•

input voltage reference VREF+ or internal VREFBUF reference.

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

to different DMA streams.

3.21

Ultra-low-power comparators (COMP)

STM32H757xI devices embed two rail-to-rail comparators (COMP1 and COMP2). They

feature programmable reference voltage (internal or external), hysteresis and speed (low

speed for low-power) as well as selectable output polarity.

The reference voltage can be one of the following:

•

An external I/O

•

A DAC output channel

•

An internal reference voltage or submultiple (1/4, 1/2, 3/4).

All comparators can wake up from Stop mode, generate interrupts and breaks for the timers,

and be combined into a window comparator.

3.22

Operational amplifiers (OPAMP)

STM32H757xI devices embed two rail-to-rail operational amplifiers (OPAMP1 and

OPAMP2) with external or internal follower routing and PGA capability.

The operational amplifier main features are:

•

PGA with a non-inverting gain ranging of 2, 4, 8 or 16 or inverting gain ranging of -1, -3,

-7 or -15

•

One positive input connected to DAC

•

Output connected to internal ADC

•

Low input bias current down to 1 nA

•

Low input offset voltage down to 1.5 mV

•

Gain bandwidth up to 7.3 MHz

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