Acronym Definition
MTTFd Mean time to failure
NA Not available
PDS(SR) Power drive system (safety related)
PEc Programmable electronics - core
PEd Programmable electronics - diagnostic
PFD Probability of Dangerous Failure on Demand
PFH Probability of failure per hour
PL Performance level
PST Process safety time
SFF Safe failure fraction
SIL Safety integrity level
SRCF Safety-related control function
SRECS Safety-related electrical control systems
SRP/CS Safety-related parts of control systems
SW Software
Read also the following definitions used within this manual:
• End user: the STM32F2 Series final user of that is in charge of integrating the MCU in a real application (for
example an electronic control board).
• Application software: the actual software running on the STM32F2 Series MCUs and implementing the
safety function.
1.3
Reference normative
This document is written in compliance with the IEC 61508 international norm for functional safety of electrical,
electronic and programmable electronic safety-related systems.
The version used as reference is IEC 61508:1-7 © IEC:2010.
The other functional safety standards considered in this manual are the following:
• ISO 26262-1, 2, 3, 4, 5, 6, 7, 8, 9: 2011(E), ISO 26262-10: 2012(E),
• ISO 13849-1:2006, ISO 13849-2:2010,
• IEC 62061:2012-11, ed. 1.1,
• IEC 61800-5-2:2007, ed.1.0,
The following table reports the mapping of this document content with respect to the requirements listed in the
IEC 61508-2 Annex D.
Table 2. Mapping between this document content and IEC 61508-2 Annex D requirements
IEC 61508 requirement (part 2 annex D) Reference
D2.1 a) a functional specification of the functions capable of being performed Section 3
D2.1 b) identification of the hardware and/or software configuration of the compliant item Section 3.2
D2.1 c) constraints on the use of the compliant item or assumptions on which analysis of the behavior or
failure rates of the item are based
Section 3.2
UM1845
Reference normative
UM1845 - Rev 4
page 3/108
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