ST STM32L4 Series - User Manual

Introduction
This document must be read along with the technical documentation such as reference manual(s) and datasheets for the
STM32L4 and STM32L4+ Series microcontroller devices, available on www.st.com.
It describes how to use the devices in the context of a safety-related system, specifying the user's responsibilities for installation
and operation in order to reach the targeted safety integrity level. It also pertains to the X-CUBE-STL software product.
It provides the essential information pertaining to the applicable functional safety standards, which allows system designers to
avoid going into unnecessary details.
The document is written in compliance with IEC 61508, and it provides information relative to other functional safety standards.
The safety analysis in this manual takes into account the device variation in terms of memory size, available peripherals, and
package.
STM32L4 and STM32L4+ Series safety manual
UM2305
User manual
UM2305 - Rev 10 - June 2021
For further information contact your local STMicroelectronics sales office.
www.st.com

ST STM32L4 Series Specifications

General

Brand	ST
Model	STM32L4 Series
Category	Microcontrollers
Language	English

Summary

Introduction to STM32 Safety Manual

About This Document

Purpose and Scope

Describes the document's objective, scope, and target audience for safety-related systems.

Normative References

Lists applicable functional safety standards and norms considered in the document.

Reference Safety Architecture

Compliant Item Definition

Defines the 'Compliant item' and its role in safety architecture schemes.

Reference Safety Architectures - 1 oo1

Reference Safety Architectures - 1 oo2

Safety Analysis Assumptions

Safety Requirement Assumptions

Details the assumed safety requirements and conditions for implementing safety functions.

Hardware and Software Diagnostics

Arm Cortex-M4 CPU Diagnostics

Details safety mechanisms for the CPU core, including self-tests and control flow monitoring.

Analog-to-Digital Converter (ADC) Diagnostics

Covers diagnostic methods for ADC inputs, including multiple acquisitions and range checks.

Real-Time Clock Module (RTC) Diagnostics

Explains methods to ensure RTC accuracy and detect timestamp failures.

UART and LPUART Communication Safety

Outlines safety mechanisms for UART and LPUART communication protocols.

Conditions of Use

Safety Results

Random Hardware Failure Safety Results

Presents the outcome of the safety analysis concerning random hardware failures.

Analysis of Dependent Failures

Power Supply Dependent Failures

Discusses power supply as a potential source of dependent failures affecting MCU modules.

Clock System Dependent Failures

Addresses clock system alterations as a source of dependent failures impacting MCU parts.

Change Impact Analysis for Other Safety Standards

ISO 13849-1:2015, ISO 13849-2:2012 Compliance

Analyzes the impact of using STM32 devices with ISO 13849 safety standards.

Revision History

Glossary