AN1661 Sensor Calibration on SSC7102 Bosch Sensor Fusion Solution for Windows 8 Author: Tom Tse Microchip Technology INTRODUCTION This document provides information regarding end of line sensor calibration guidance for Windows 8.x using Microchip’s SSC7102 Bosch Sensor Fusion (BSX) Solution. It provides information that will assist a customer in passing WHQL and determine if the results are sufficient. Audience This document is written for system designers who have a background and are familiar with the sensor platform for Windows 8 and WHQL process. References The following documents should be referenced when using this application note. See your Microchip representative for availability. • • • • • • • • SSC7102 Data Sheet, DS00001654 SSC7102 Bosch Sensor Fusion Firmware Addendum, DS00001657 SSC7102 Base Board Assy 6730A Rev. A1.0 Schematics SSC7102 Bosch Module Assy 6731A Rev. A1.4 Schematics Microsoft “Windows 8 Sensor Calibration and Configuration Persistence” White Paper, September 28, 2012 Microsoft “Integrating Motion and Orientation Sensors” White Paper, June 10, 2013 Microsoft “Guide to Running WHCK Motion Sensor Tests”, Version 0.9, August 14, 2013 Bosch Sensors Calibration Presentation and Application Notes, please contact Bosch for this documentation • Multiple Accelerometers Inline Calibration (Bosch Document Number: BST-MAS-AN030-00) Application Note, Rev 1.0, December 2, 2013 • Refer to sensor vendors’ data sheet and application notes for layout and placement guidance, for example - Bosch BMC Handling, (Bosch Document Number: BST-MCSHS000-00) placement, and mounting guideline, Version 1.0, April 4, 2011 - Bosch BMC PCB placement guideline (Bosch Document Number: BST-MCS-AN002-00) Application Note, Version 1.0, March 25, 2011 SCOPE Sensors, like accelerometers, magnetometers, and gyroscopes, are used in modern consumer electronic devices to gather information in the current physical environment such as location, position, etc. of the device. All of these sensors should be calibrated to obtain the most accurate data that reflects the physical reality of the device as well as passing the Microsoft WHQL tests. CALIBRATION TO MEET WINDOWS 8 WHQL REQUIREMENT • The Bosch “Self-contained 9-axis sensor fusion” algorithm has fast in-use background calibration of all sensors and meets the Microsoft Windows 8 specification. • There is no need to build a sample set of boards to help calibrate sensors. The exception is when a magnetometer is placed near metal devices or large current traces. - Need one sample to calibrate magnetometer. 2014 Microchip Technology Inc. DS00001661B-page 1 AN1661 • All sensors have close to 2X margin to meet Windows 8 accuracy requirements. For example, inclination accuracy is 3 degrees, and specification is 5 degrees. • No end of line calibration is required for WHQL certification. However, if high accuracy is required in the application, only accelerometer calibration is required. Please see application note “Multiple Accelerometers: Inline Calibration”, Rev. 1.0, December 2, 2013 for more information on this. DS00001661B-page 2 2014 Microchip Technology Inc. AN1661 APPENDIX A: TABLE A-1: APPLICATION NOTE REVISION HISTORY REVISION HISTORY Revision Level & Date Section/Figure/Entry Correction DS00001661B (04-24-14) Calibration to meet Windows 8 WHQL requirement Added a note about end of line calibration. DS00001661A (01-22-14) All Initial Release 2014 Microchip Technology Inc. DS00001661B-page 3 AN1661 THE MICROCHIP WEB SITE Microchip provides online support via our WWW site at www.microchip.com. This web site is used as a means to make files and information easily available to customers. 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Note the following details of the code protection feature on Microchip devices: • Microchip products meet the specification contained in their particular Microchip Data Sheet. • Microchip believes that its family of products is one of the most secure families of its kind on the market today, when used in the intended manner and under normal conditions. • There are dishonest and possibly illegal methods used to breach the code protection feature. All of these methods, to our knowledge, require using the Microchip products in a manner outside the operating specifications contained in Microchip’s Data Sheets. Most likely, the person doing so is engaged in theft of intellectual property. • Microchip is willing to work with the customer who is concerned about the integrity of their code. • Neither Microchip nor any other semiconductor manufacturer can guarantee the security of their code. Code protection does not mean that we are guaranteeing the product as “unbreakable.” Code protection is constantly evolving. We at Microchip are committed to continuously improving the code protection features of our products. Attempts to break Microchip’s code protection feature may be a violation of the Digital Millennium Copyright Act. If such acts allow unauthorized access to your software or other copyrighted work, you may have a right to sue for relief under that Act. Information contained in this publication regarding device applications and the like is provided only for your convenience and may be superseded by updates. It is your responsibility to ensure that your application meets with your specifications. MICROCHIP MAKES NO REPRESENTATIONS OR WARRANTIES OF ANY KIND WHETHER EXPRESS OR IMPLIED, WRITTEN OR ORAL, STATUTORY OR OTHERWISE, RELATED TO THE INFORMATION, INCLUDING BUT NOT LIMITED TO ITS CONDITION, QUALITY, PERFORMANCE, MERCHANTABILITY OR FITNESS FOR PURPOSE. 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Silicon Storage Technology is a registered trademark of Microchip Technology Inc. in other countries. Analog-for-the-Digital Age, Application Maestro, BodyCom, chipKIT, chipKIT logo, CodeGuard, dsPICDEM, dsPICDEM.net, dsPICworks, dsSPEAK, ECAN, ECONOMONITOR, FanSense, HI-TIDE, In-Circuit Serial Programming, ICSP, Mindi, MiWi, MPASM, MPF, MPLAB Certified logo, MPLIB, MPLINK, mTouch, Omniscient Code Generation, PICC, PICC-18, PICDEM, PICDEM.net, PICkit, PICtail, REAL ICE, rfLAB, Select Mode, SQI, Serial Quad I/O, Total Endurance, TSHARC, UniWinDriver, WiperLock, ZENA and ZScale are trademarks of Microchip Technology Incorporated in the U.S.A. and other countries. SQTP is a service mark of Microchip Technology Incorporated in the U.S.A. GestIC and ULPP are registered trademarks of Microchip Technology Germany II GmbH & Co. KG, a subsidiary of Microchip Technology Inc., in other countries. flexPWR, JukeBlox, Kleer, KleerNet, MediaLB, and MOST The preceding is a non-exhaustive list of trademarks in use in the US and other countries. For a complete list of trademarks, email a request to [email protected] The absence of a trademark (name, logo, etc.) from the list does not constitute a waiver of any intellectual property rights that SMSC has established in any of its trademarks. All other trademarks mentioned herein are property of their respective companies. © 2014, Microchip Technology Incorporated, Printed in the U.S.A., All Rights Reserved. ISBN: 9781632761767 Microchip received ISO/TS-16949:2009 certification for its worldwide headquarters, design and wafer fabrication facilities in Chandler and Tempe, Arizona; Gresham, Oregon and design centers in California and India. 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