Introduction

The number of sensors connected to a main device acting as a controller has steadily increased in the last couple of years.

Managing multiple sensors is becoming more complex with heterogeneous serial interfaces like the still widespread, low-cost

I

2

C, SPI, capable of handling more bandwidth, or the traditional UART, and extra signals (GPIOs) for interrupt and/or power

modes.

A high level of hardware and software integration, power efficiency, high speed, cost effectiveness, and fast time-to-market are

required. For this reason, in 2017, the MIPI Alliance introduced a new serial interface called improved inter-integrated circuit

(

The purpose of this application note is to provide some I3C examples based on STM32CubeMX, to cover most of the I3C

communication modes available on STM32 microcontrollers and provide recommendations for the correct use of the I3C

peripheral.

This application note starts with an I3C bus overview, followed by a description of the I3C features, and a use case based on

STM32CubeMX for communicating only with I3C targets via an I3C mixed bus through dynamic address assignment, CCC

commands, data exchange with sensors (LSM6DSO and LIS2DW12) in private or direct mode, and the management of in-band

interrupts from targets.

Table 1. Applicable products

Type Products

Microcontroller STM32H5 series, STM32H7R3/7S3 line, STM32H7R7/7S7 line

Cortex

®

core-based STM32 microcontrollers.

Note: Arm is a registered trademark of Arm Limited (or its subsidiaries) in the US and/or elsewhere.

AN5879

General information