January 2015

DocID024134 Rev 2

1/17

1

AN4232

Application note

Getting started with analog comparators

for STM32F3 series

Introduction

This document describes the main features of the analog comparator embedded in

STM32F3 series. The application cases are:

•

Cycle-by-cycle current control

•

Frequency and pulse width measurement

•

Analog voltage monitoring

•

Preventing false over-current detections in motor control applications

•

Humidity measurement

The five application cases demonstrate the usefulness of analog comparators and show

how they are integrated with other peripherals, for example, the digital-to-analog-converter

(DAC) and timers.

To ensure a quick start, some application cases presented in this document are

implemented in C language and are available in the STM32F30x and STM32F37x DSP and

standard peripherals library packages.

Please note that this document is not intended to replace the analog comparator (COMP)

section in the product reference manual.

All values given in this document are for guidance only. Please refer to the related datasheet

for guaranteed and up-to-date values.

Throughout this document:

• STM32F30x refers to the STM32F301, STM32F302, STM32F303, STM32F3x8,

STM32F328, STM32F358, STM32F398 and STM32F334.

• STM32F37x refers to the STM32F373 and STM32F378 product lines.

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