ST STM8A Application Note

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Reference manual (449 pages)

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AN3006

Application note

EMC guidelines for STM8A microcontroller

Introduction

To meet the demand for more functionalities, better performance and reduced cost, the

semiconductor industry develops microcontrollers with both high density design technology

and higher clock frequencies. This has intrinsically increased potential noise emission and

noise sensitivity.

Therefore, application developers must now apply EMC "hardening" techniques in the

design of firmware and PCB layout at system level.

This application note is intended for application designers who need to reach the optimum

level of EMC performance. It gives microcontroller EMC features and compliance standards.

This document only concentrates on STM8A features and behaviors. For general

information on EMC for ST microcontrollers, refer to the "EMC design guide for ST

microcontrollers" application note (AN1709).

General recommendations for STM8A devices are summarized in the "Getting started with

the STM8A" application note (AN2677). This document also provides basic EMC

recommendations.

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Summary of Contents for ST STM8A

Page 1 EMC performance. It gives microcontroller EMC features and compliance standards. This document only concentrates on STM8A features and behaviors. For general information on EMC for ST microcontrollers, refer to the “EMC design guide for ST microcontrollers” application note (AN1709).
Page 2: Table Of Contents
Table of contents STM8A: designed for EMC robustness ......3 Power supply ..........4 Layout recommendations .
Page 3: Stm8A: Designed For Emc Robustness
STM8A: designed for EMC robustness STM8A: designed for EMC robustness Most STM8A product family applications require a high level of robustness. The STM8A devices have been designed to meet this requirement with a cost effective approach. The following built-in features have been implemented for this purpose: ●...
Page 4: Power Supply
Power supply AN3006 Power supply The STM8A product family is designed for standard applications in the 3.3 V to 5 V (+/-10%) supply voltage range. All power pins must be connected: V DDIOx SSIOx The V pin is the regulator output. It provides the 1.8 V supply to the core and the peripherals.
Page 5: Layout Recommendations
AN3006 Layout recommendations Layout recommendations The schematic diagram shows the appropriate bill of materials but, for EMC performance, special care should be taken for the ground plane layout, track width and length, etc. It is important to pay special attention to: ●...
Page 6 Layout recommendations AN3006 Figure 3. Bottom view of a 64-pin package layout Crystal ai15362 Note: Grey: bottom side Dark grey: top side 6/12 Doc ID 15988 Rev 1...
Page 7: Single Layer Board
AN3006 Layout recommendations Single layer board For 32-pin package and below, a single layer board can offer a very good level of EMC performance. Figure 4. Top view of a 32-pin package layout Supplies towards other components Crystal 1: RESET 2: OSCIN 3: OSCOUT 4: VSS...
Page 8: Emc Features
EMC features AN3006 EMC features EMC features are specific to each device. Please refer to the Electrical features section of the product datasheet for any information on these features. 8/12 Doc ID 15988 Rev 1...
Page 9: Software Recommendations
(“Software techniques for improving microcontroller EMC performance”) also apply to the STM8A product family. This section lists the STM8A specifications related to the software techniques written in the AN1015. It gives the values for STM8A products, although it is strongly recommended to read the AN1015 carefully in order to safely implement the software recommendations.
Page 10: Reset Sources
Each of these flags can be cleared by software by writing 1 into the corresponding bit location. They can also all be cleared by a power-on reset. For a description of these reset sources, please refer to the STM8A microcontroller family reference manual (RM0009).
Page 11: Revision History
AN3006 Revision history Revision history Table 1. Document revision history Date Revision Changes 08-Jul-2009 Initial release. Doc ID 15988 Rev 1 11/12...
Page 12 No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted under this document. If any part of this document refers to any third party products or services it shall not be deemed a license grant by ST for the use of such third party products or services, or any intellectual property contained therein or considered as a warranty covering the use in any manner whatsoever of such third party products or services or any intellectual property contained therein.