White Paper

Guidelines for Meeting IEC 60730 Class B Requirements with FM3 MCUs

Self-Test Library Implementations

Fujitsu Semiconductor America, Inc.

March 2011

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• Introduction
• IEC 60730 Self-Test Requirements
  
  • Software Considerations
  • Hardware Considerations
  • Fujitsu FM3 Family Microcontrollers for Appliances
• IEC 60730 Self-Test Library Structure
  
  • Generic tests included in the FM3 Self-Test Library
  • Self-Test Library: Structure of Test Routines
    - CPU Test
    - CPU Register Test
    - Clock tests
    - Interrupt test
    - ROM/Flash checksum integrity check
    - RAM Test (using checkerboard)
    - IO Peripheral Tests
  • Fujitsu Self-Test Library Deliverables
  • Application-specific tests that need modifications per user applications
• IEC 60730 Class B solution Structure
  
  • Integrating the software into user applications
• Conclusion
• Appendix A

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Introduction

Fujitsu ARM Cortex — FM3 family microcontrollers (MCUs) offer a variety of integrated functional safety features that suit home appliances, white goods and other motor-control applications. Fujitsu also provides an extensive library of safety-related software routines to make these features easier to use. Because these software routines are compliant with International Electro-Technical Commission (IEC) safety standards, using the routines greatly simplifies IEC certification for the final product.

While IEC standards and certification criteria are primarily used in Europe, companies wishing to market products worldwide typically opt to comply with IEC standards rather than implement separate designs and manufacturing plans for every geographic region. Motor drives, white goods, and other appliances that could be unsafe if one or more mechanical or electronic components fail are now subject to IEC testing and qualification requirements. The IEC 60730 standard covers mechanical, electrical, electronic, EMC, and abnormal operation of AC appliances.

Small, inexpensive, safety-conscious MCUs are destined to play a critical role in IEC 60730 qualification because of their ability to sense a malfunction and switch the appliance off — under virtually any circumstances. Although certification is attained at a system level, many aspects of the MCU and available software libraries have a direct impact on achieving IEC 60730 compliance. The right MCU hardware and software functions can greatly reduce the amount of work involved in achieving compliance and thus minimize time to market. As a result, choosing an appropriate MCU is crucially important to market success.

This application note introduces some important aspects of the IEC 60730 standards and describes how to take advantage of Fujitsu FM3 microcontrollers and code libraries to comply with the standards. (For a broader overview of IEC safety classifications, see Appendix A.) The main focus of this paper is the library of self-test routines available for FM3 microcontrollers.

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