STM32F334X4 datasheet(21/115 Pages) STMICROELECTRONICS

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STM32F334x4 STM32F334x6 STM32F334x8

Functional overview

input channels. 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.

3.10.3

VBAT battery voltage monitoring

This embedded hardware feature allows the application to measure the VBAT battery voltage

using the internal ADC channel ADC1_IN17. As the VBAT voltage may be higher than VDDA,

and thus outside the ADC input range, the VBAT pin is internally connected to a bridge

divider by 2. As a consequence, the converted digital value is half the VBAT voltage.

3.10.4

OPAMP2 reference voltage (VOPAMP2)

OPAMP2 reference voltage can be measured using ADC2 internal channel 17.

3.11

Digital-to-analog converter (DAC)

One 12-bit buffered DAC channel (DAC1_OUT1) and two 12-bit unbuffered DAC channels

(DAC1_OUT2 and DAC2_OUT1) 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:

•

Three DAC output channels

•

8-bit or 12-bit monotonic output

•

Left or right data alignment in 12-bit mode

•

Synchronized update capability

•

Noise-wave generation (only on DAC1)

•

Triangular-wave generation (only on DAC1)

•

Dual DAC channel independent or simultaneous conversions

•

DMA capability for each channel

•

External triggers for conversion

3.12

Operational amplifier (OPAMP)

The STM32F334x4/6/8 embeds an operational amplifier (OPAMP2) 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 MHz GBP

•

0.5 mA output capability

•

Rail-to-rail input/output

•

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

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