STM32F358XC datasheet(20/134 Pages) STMICROELECTRONICS

20 / 134 page

Functional overview

STM32F358xC

20/134

DocID025540 Rev 4

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 ADC_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 (VOPAMP)

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

channel: VOPAMP1 connected to ADC1 channel 15, VOPAMP2 connected to ADC2

channel 17, VOPAMP3 connected to ADC3 channel 17, VOPAMP4 connected to ADC4

channel 17.

3.14

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 STM32F358xC devices

•

8-bit or 10-bit monotonic output

•

Left or right data alignment in 12-bit mode

•

Synchronized update capability on STM32F358xC devices

•

Noise-wave generation

•

Triangular-wave generation

•

Dual DAC channel independent or simultaneous conversions on STM32F358xC

devices

•

DMA capability (for each channel on STM32F358xC devices)

•

External triggers for conversion

3.15

Operational amplifier (OPAMP)

The STM32F358xC devices embed 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.

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