STM32F318C8 datasheet(20/125 Pages) STMICROELECTRONICS

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Functional overview

STM32F318C8 STM32F318K8

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DocID026294 Rev 5

3.11.3

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.

3.12

Digital-to-analog converter (DAC)

One 12-bit buffered DAC channel (DAC1_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:



One DAC 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



DMA capability



External triggers for conversion

3.13

Operational amplifier (OPAMP)

The STM32F318x8 devices embed one operational amplifier with external or internal

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

components). When the 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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