STM32F303VB datasheet(21/148 Pages) STMICROELECTRONICS

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DocID023353 Rev 13

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STM32F303xB STM32F303xC

Functional overview

3.13.3

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.

3.13.4

OPAMP reference voltage (VREFOPAMP)

Every OPAMP reference voltage can be measured using a corresponding ADC internal

channel: VREFOPAMP1 connected to ADC1 channel 15, VREFOPAMP2 connected to

ADC2 channel 17, VREFOPAMP3 connected to ADC3 channel 17, VREFOPAMP4

connected to ADC4 channel 17.

3.14

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:

•

Two DAC output channels

•

8-bit or 10-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)

•

External triggers for conversion

3.15

Operational amplifier (OPAMP)

The STM32F303xB/STM32F303xC embeds 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.

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