STM32F302XB datasheet(22/133 Pages) STMICROELECTRONICS

22 / 133 page

Functional overview

STM32F302xx/STM32F303xx

22/133

Doc ID 023353 Rev 5

3.13

Digital-to-analog converter (DAC)

Up to 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 on STM32F303xB/STM32F303xC devices

●

8-bit or 10-bit monotonic output

●

Left or right data alignment in 12-bit mode

●

Synchronized update capability on STM32F303xB/STM32F303xC devices

●

Noise-wave generation

●

Triangular-wave generation

●

Dual DAC channel independent or simultaneous conversions on

STM32F303xB/STM32F303xC devices

●

DMA capability (for each channel on STM32F303xB/STM32F303xC devices)

●

External triggers for conversion

3.14

Operational amplifier (OPAMP)

The STM32F302xx/STM32F303xx embeds up to four operational amplifiers with external or

internal follower routing and PGA capability (or even amplifier and filter capability with

external components). When an operational amplifier is selected, an external ADC channel

is used to enable output measurement.

The operational amplifier features:

●

8.2 MHz bandwidth

●

0.5 mA output capability

●

Rail-to-rail input/output

●

In PGA mode, the gain can be programmed to be 2, 4, 8 or 16.

3.15

Fast comparators (COMP)

The STM32F302xx/STM32F303xx devices embed seven fast rail-to-rail comparators with

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

low power) and with selectable output polarity.

The reference voltage can be one of the following:

●

External I/O

●

DAC output pin

●

Internal reference voltage or submultiple (1/4, 1/2, 3/4). Refer to Table 26: Embedded

internal reference voltage on page 60 for the value and precision of the internal

reference voltage.

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

timers and can be also combined per pair into a window comparator

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