MCP355X Tiny Application Sensor Demo Board User's Guide (c) 2006 Microchip Technology Inc. DS51598A 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in this publication regarding device applications and the like is provided only for your convenience and may be superseded by updates.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. Microchip disclaims all liability arising from this information and its use. Use of Microchip devices in life support and/or safety applications is entirely at the buyer's risk, and the buyer agrees to defend, indemnify and hold harmless Microchip from any and all damages, claims, suits, or expenses resulting from such use. No licenses are conveyed, implicitly or otherwise, under any Microchip intellectual property rights. Trademarks The Microchip name and logo, the Microchip logo, Accuron, dsPIC, KEELOQ, microID, MPLAB, PIC, PICmicro, PICSTART, PRO MATE, PowerSmart, rfPIC and SmartShunt are registered trademarks of Microchip Technology Incorporated in the U.S.A. and other countries. AmpLab, FilterLab, Migratable Memory, MXDEV, MXLAB, SEEVAL, SmartSensor and The Embedded Control Solutions Company are registered trademarks of Microchip Technology Incorporated in the U.S.A. Analog-for-the-Digital Age, Application Maestro, dsPICDEM, dsPICDEM.net, dsPICworks, ECAN, ECONOMONITOR, FanSense, FlexROM, fuzzyLAB, In-Circuit Serial Programming, ICSP, ICEPIC, Linear Active Thermistor, MPASM, MPLIB, MPLINK, MPSIM, PICkit, PICDEM, PICDEM.net, PICLAB, PICtail, PowerCal, PowerInfo, PowerMate, PowerTool, REAL ICE, rfLAB, rfPICDEM, Select Mode, Smart Serial, SmartTel, Total Endurance, UNI/O, WiperLock and ZENA 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. All other trademarks mentioned herein are property of their respective companies. (c) 2006, Microchip Technology Incorporated, Printed in the U.S.A., All Rights Reserved. Printed on recycled paper. Microchip received ISO/TS-16949:2002 certification for its worldwide headquarters, design and wafer fabrication facilities in Chandler and Tempe, Arizona, Gresham, Oregon and Mountain View, California. The Company's quality system processes and procedures are for its PICmicro(R) 8-bit MCUs, KEELOQ(R) code hopping devices, Serial EEPROMs, microperipherals, nonvolatile memory and analog products. In addition, Microchip's quality system for the design and manufacture of development systems is ISO 9001:2000 certified. DS51598A-page ii (c) 2006 Microchip Technology Inc. MCP355X TINY APPLICATION SENSOR DEMO BOARD USER'S GUIDE Table of Contents Preface ........................................................................................................................... 1 Introduction............................................................................................................ 1 Document Layout .................................................................................................. 1 Conventions Used in this Guide ............................................................................ 2 Recommended Reading........................................................................................ 2 The Microchip Web Site ........................................................................................ 3 Customer Support ................................................................................................. 3 Document Revision History ................................................................................... 3 Chapter 1. Product Overview ....................................................................................... 5 1.1 Introduction ..................................................................................................... 5 1.2 What is the MCP355X Tiny Application Sensor Demo Board? ...................... 5 1.3 What the MCP355X Tiny Application Sensor Demo Board Kit Includes ........ 5 Chapter 2. Installation and Operation ......................................................................... 7 2.1 Introduction ..................................................................................................... 7 2.2 Features ......................................................................................................... 7 2.3 Functional Block Descriptions ........................................................................ 8 Appendix A. Schematic and Layouts ........................................................................ 11 A.1 Introduction .................................................................................................. 11 A.2 Schematics and PCB Layout ....................................................................... 11 A.3 Board - Schematic ...................................................................................... 12 A.4 Board Layout - Top Layer .......................................................................... 13 A.5 Board Layout - Bottom Layer ..................................................................... 14 Appendix B. Bill Of Materials (BOM) ......................................................................... 15 Worldwide Sales and Service .................................................................................... 16 (c) 2006 Microchip Technology Inc. DS51598A-page iii MCP355X Tiny Application Sensor Demo Board User's Guide NOTES: DS51598A-page iv (c) 2006 Microchip Technology Inc. MCP355X TINY APPLICATION SENSOR DEMO BOARD USER'S GUIDE Preface NOTICE TO CUSTOMERS All documentation becomes dated, and this manual is no exception. Microchip tools and documentation are constantly evolving to meet customer needs, so some actual dialogs and/or tool descriptions may differ from those in this document. Please refer to our web site (www.microchip.com) to obtain the latest documentation available. Documents are identified with a "DS" number. This number is located on the bottom of each page, in front of the page number. The numbering convention for the DS number is "DSXXXXXA", where "XXXXX" is the document number and "A" is the revision level of the document. INTRODUCTION This chapter contains general information that will be useful to know before using the MCP355X Tiny Application Sensor Demo Board. Items discussed in this chapter include: * * * * * * Document Layout Conventions Used in this Guide Recommended Reading The Microchip Web Site Customer Support Document Revision History DOCUMENT LAYOUT This document describes how to use the MCP355X Tiny Application Sensor Demo Board as a development tool to emulate and debug firmware on a target board. The manual layout is as follows: * Chapter 1. "Product Overview" - This is an introduction to the MCP355X Tiny Application Sensor Demo Board. It covers the kit contents, associated tools and how they work together. * Chapter 2. "Installation and Operation" - Covers the initial set-up of the MCP355X Tiny Application Sensor Demo Board. It lists the required tools, shows how to connect this board and demonstates how to verify the set-up. * Appendix A. "Schematic and Layouts" - Gives detailed information on the MCP355X Tiny Application Sensor Demo Board. Includes detailed circuit explanation, schematic, board layouts and Bill of Materials (BOM). * Appendix B. "Bill Of Materials (BOM)" - Gives detailed information on the MCP355X Tiny Application Sensor Demo Board's firmware. (c) 2006 Microchip Technology Inc. DS51598A-page 1 MCP355X Tiny Application Sensor Demo Board User's Guide CONVENTIONS USED IN THIS GUIDE This manual uses the following documentation conventions: DOCUMENTATION CONVENTIONS Description Arial font: Italic characters Initial caps Quotes Underlined, italic text with right angle bracket Bold characters N`Rnnnn Text in angle brackets < > Courier New font: Plain Courier New Represents Examples Referenced books Emphasized text A window A dialog A menu selection A field name in a window or dialog A menu path MPLAB(R) IDE User's Guide ...is the only compiler... the Output window the Settings dialog select Enable Programmer "Save project before build" A dialog button A tab A number in verilog format, where N is the total number of digits, R is the radix and n is a digit. A key on the keyboard Click OK Click the Power tab 4`b0010, 2`hF1 Italic Courier New Sample source code Filenames File paths Keywords Command-line options Bit values Constants A variable argument Square brackets [ ] Optional arguments Curly brackets and pipe character: { | } Ellipses... Choice of mutually exclusive arguments; an OR selection Replaces repeated text Represents code supplied by user File>Save Press <Enter>, <F1> #define START autoexec.bat c:\mcc18\h _asm, _endasm, static -Opa+, -Opa0, 1 0xFF, `A' file.o, where file can be any valid filename mcc18 [options] file [options] errorlevel {0|1} var_name [, var_name...] void main (void) { ... } RECOMMENDED READING This user's guide describes how to use the MCP355X Tiny Application Sensor Demo Board. Other useful documents are listed below. The following Microchip documents are available and recommended as supplemental reference resources. MCP3550/1/3 Data Sheet, "Low-Power Single Channel 22-Bit Delta-Sigma ADCs" (DS21950) This data sheet provides detailed information regarding the MCP355X product family. DS51598A-page 2 (c) 2006 Microchip Technology Inc. Preface THE MICROCHIP WEB SITE Microchip provides online support via our web site at www.microchip.com. This web site is used as a means to make files and information easily available to customers. Accessible by using your favorite internet browser, the web site contains the following information: * Product Support - Data sheets and errata, application notes and sample programs, design resources, user's guides and hardware support documents, latest software releases and archived software * General Technical Support - Frequently Asked Questions (FAQs), technical support requests, online discussion groups, Microchip consultant program member listing * Business of Microchip - Product selector and ordering guides, latest Microchip press releases, listing of seminars and events, listings of Microchip sales offices, distributors and factory representatives CUSTOMER SUPPORT Users of Microchip products can receive assistance through several channels: * * * * * Distributor or Representative Local Sales Office Field Application Engineer (FAE) Technical Support Development Systems Information Line Customers should contact their distributor, representative or field application engineer for support. Local sales offices are also available to help customers. A listing of sales offices and locations is included in the back of this document. Technical support is available through the web site at: http://support.microchip.com DOCUMENT REVISION HISTORY Revision A (April 2006) * Initial Release of this Document. (c) 2006 Microchip Technology Inc. DS51598A-page 3 MCP355X Tiny Application Sensor Demo Board User's Guide NOTES: DS51598A-page 4 (c) 2006 Microchip Technology Inc. MCP355X TINY APPLICATION SENSOR DEMO BOARD USER'S GUIDE Chapter 1. Product Overview 1.1 INTRODUCTION This chapter provides an overview of the MCP355X Tiny Application Sensor Demo Board and covers the following topics: * What is the MCP355X Tiny Application Sensor Demo Board? * What the MCP355X Tiny Application Sensor Demo Board kit includes 1.2 WHAT IS THE MCP355X TINY APPLICATION SENSOR DEMO BOARD? The MCP3550/1/3 devices are 2.7V to 5.5V low-power, 22-bit Delta-Sigma Analog-to-Digital Converters (ADCs). The MCP355X Tiny Application Sensor Demo Board is used to demonstrate the most basic application of the devices using a ratiometric connection with VDD as VREF. The MCP355X Tiny Application Sensor Demo Board includes all the necessary PCB circuits and PCB layout tips required to obtain the performance demonstrated on the PC. 1.3 WHAT THE MCP355X TINY APPLICATION SENSOR DEMO BOARD KIT INCLUDES This MCP355X Tiny Application Sensor Demo Board Kit includes: * The MCP355X Tiny Application Sensor Demo Board (with MCP3551 installed) * MCP355X Tiny Application Sensor Demo Board User's Guide * MCP3550/1/3 Data Sheet, "Low-Power Single Channel 22-Bit Delta-Sigma ADCs", (DS21950) * AN1007 Application Note "Designing with the MCP3551 Delta-Sigma ADC", (DS01007) * Mini-USB Cable (c) 2006 Microchip Technology Inc. DS51598A-page 5 MCP355X Tiny Application Sensor Demo Board User's Guide NOTES: DS51598A-page 6 (c) 2006 Microchip Technology Inc. MCP355X TINY APPLICATION SENSOR DEMO BOARD USER'S GUIDE Chapter 2. Installation and Operation 2.1 INTRODUCTION 350 350 350 350 Input Filtering The MCP355X Tiny Application Sensor Demo Board is designed to demonstrate the performance of the MCP3550/1/3 devices in a simple low-cost application. The circuit uses a ratiometric sensor configuration and uses the system power supply as the voltage reference. The extreme common mode rejection capability of the MCP3551 device, along with it's excellent normal mode power supply rejection at 50 and 60 Hz, allows for this system performance. The functional circuit block diagram is shown in Figure 2-1. VIN+ VREF VDD SCK MCP3551 SDO VINCS V 3 SS SM5420 Absolute Pressure Sensor Analog PS Filtering Digital PIC18F4550 MCP355X Tiny Application Sensor Demo Board USB 5 USB interface to DataView on PC for noise analysis FIGURE 2-1: 2.2 PC Running DataView Ratiometric Sensor Configuration. FEATURES The MCP355X Tiny Application Sensor Demo Board has the following features: * Better than 16-bit system performance from a direct connected PC USB connection using ratiometric * Simple USB connection to DataView on the PC showing system performance * Low-cost design for analog-to-digital conversion (c) 2006 Microchip Technology Inc. DS51598A-page 7 MCP355X Tiny Application Sensor Demo Board User's Guide USB Power (Digital) Power Supply Filtering USB Connector JP1 USB Power & Data Digital Ground Analog Ground Plane PIC18F4550 U2 Plane Filter Network Analog Power & Reference U3 SM5420 FIGURE 2-2: 2.3 MCP3551 U4 Block Diagram. FUNCTIONAL BLOCK DESCRIPTIONS 2.3.1 SM5420 The SM5420 device is an absolute pressure sensor in a surface mount SOIC package. The device is a piezo resistive silicon device available from Silicon Microstructure. With a constant excitation voltage, the output changes linearly with pressure. The zero scale error of the device is rated at 10 mV/V and the full scale output is rated at 60 mV/V 20 mV. These large errors require an overall system calibration, as well as temperature compensation for a working absolute pressure sensor design. This board demonstrates the overall system resolution and noise performance of the ADC and sensor with no voltage reference. 2.3.2 MCP3551 The MCP3551 is a 22-bit Delta-Sigma A/D converter. The device includes a third-order modulator, fourth-order digital SINC filter, internal oscillator for oversampling clock and digital logic for a simple SPI interface. Digital SINC Filter The MCP3551 device includes a digital decimation filter, which is a fourth-order modified SINC filter. This filter averages the incoming bitstream from the modulator and outputs a 22-bit conversion word in binary two's complement. When all bits have been processed by the filter, the output code is ready for SPI communication, the RDY flag is set on the SDO/RDY pin and all the internal registers are reset in order to process the next conversion. This filter achieves greater than -80 dB of rejection at both 50 and 60 Hz. For improved performance, the MCP3550 device is available which gives greater than -120 dB of rejection at either 50 or 60 Hz. DS51598A-page 8 (c) 2006 Microchip Technology Inc. Installation and Operation Attenuation (dB) : 0 -10 -20 -30 -40 -50 -60 -70 -80 -90 -100 -110 -120 0 10 20 30 40 50 60 70 80 90 100 110 Frequency (Hz) FIGURE 2-3: SINC filter response, MCP3551 device, simultaneous 50/60 Hz Normal Mode Rejection. 2.3.3 PIC18F4550 The high speed USB PICmicro(R) microcontroller is used to connect to the PC and quickly evaluate system performance. An In-Circuit Serial ProgrammingTM (ICSPTM) connector is also included. 2.3.4 Filtering Power supply filtering using passive components is included to improve the noise performance of the MCP3551 device. The following circuit comprises the filtering on the power supply, separating the analog and digital sections of the board: 10 H 100 AvDD , VREF USB Power Supply 1 k 10 F Digital 2.3.5 10 F Analog DataView Noise Analysis The system noise from the MCP355X Tiny Application Sensor Demo Board will be an aperiodic signal not having any wave or shape. This randomness is best dealt with in statistical properties, hence the RMS measurement of the Gaussian or normal distribution. When designing a system and attempting to measure the performance, the RMS noise is much more repeatable than the peak-to-peak noise. Figure 2-4 shows two different distributions with different RMS and PEAK values, representing two different ADC output distributions. (c) 2006 Microchip Technology Inc. DS51598A-page 9 MCP355X Tiny Application Sensor Demo Board User's Guide 2 FIGURE 2-4: Two Normal or Gaussian Output Distributions. The DataView software tool is a visualization tool, showing real-time histograms using the MCP3551. The software also calculates the RMS noise of the current distribution. The number of samples in the distribution is also scalable, allowing post averaging experiments. FIGURE 2-5: DataView showing system performance in a histogram format. The software can also be used for time-based system analysis using the scope plot window. Any system drift or other time-based errors can be analyized using this visual analysis tool. FIGURE 2-6: DS51598A-page 10 DataView Scope Plot View. (c) 2006 Microchip Technology Inc. MCP355X TINY APPLICATION SENSOR DEMO BOARD USER'S Appendix A. Schematic and Layouts A.1 INTRODUCTION This appendix contains the following schematics and layouts for the MCP355X Tiny Application Sensor Demo Board User's Guide: * Board Schematic * Board - Top Layer * Board - Bottom Layer A.2 SCHEMATICS AND PCB LAYOUT Figure A.3 "Board - Schematic" shows the MCP355X Tiny Application Sensor Demo Board schematic, while Figure A.4 "Board Layout - Top Layer" and Figure A.5 "Board Layout - Bottom Layer" show the layout for the two different layers. The layer order is shown in Figure A-1. FIGURE A-1: LAYER ORDER Top Layer Bottom Layer (c) 2006 Microchip Technology Inc. DS51598A-page 11 MCP355X Tiny Application Sensor Demo Board User's Guide BOARD - SCHEMATIC M A.3 DS51598A-page 12 (c) 2006 Microchip Technology Inc. Schematic and Layouts BOARD LAYOUT - TOP LAYER BOARD EDGE A.4 (c) 2006 Microchip Technology Inc. DS51598A-page 13 MCP355X Tiny Application Sensor Demo Board User's Guide A.5 BOARD LAYOUT - BOTTOM LAYER DS51598A-page 14 (c) 2006 Microchip Technology Inc. MCP355X TINY APPLICATION SENSOR DEMO BOARD USER'S GUIDE Appendix B. Bill Of Materials (BOM) TABLE B-1: Qty BILL OF MATERIALS (BOM) Reference Description Manufacturer Part Number 1 C1 CAP .47UF 16V CERAMIC X7R 0805 Panasonic(R) 1 C2 CAP 1.0UF 10V CERAMIC X7R 0805 Kemet(R) Electronics C0805C105K8RACTU 3 C3, C9, C10 CAP .1UF 25V CERAMIC X7R 0805 Panasonic - ECG ECJ-2VB1E104K 2 C4, C6 CAP 22PF 50V CERM CHIP 0805 SMD Panasonic - ECG ECJ-2VC1H220J 1 C5 CAP .1UF 25V CERAMIC X7R 0805 Panasonic - ECG ECJ-2VB1E104K 2 C7, C8 10uF/16V CAP-SMT-ELCTRO Panasonic - ECG EEE-1CA100SR 1 D1 LED RED CLEAR 0805 SMD Lite-On Trading USA Inc LTST-C170CKT 1 J1 CONN RECEPT MINI USB2.0 5POS Hirose Electronic Co. Ltd UX60-MB-5ST 1 J2 HEADER,.1""ST MALE,1RW,6PIN,(10) .025"PST,.23GOLDTAIL Value-Pro JS1109-6-R 1 JMP1 3PIN, .100" Straight Male Headers (Gold) Value-Pro 7000-1X3SG-R 1 JMP1 Shunt SHUNT LP W/HANDLE 2 POS 30AU AMP(R)/Tyco(R) Electronics 881545-2 2 JP1, JP2 NOT INSTALLED - HZ0805E601R-10 - ECG ECJ-2YB1C474K 2 L1, L2 FERRITE 500MA 600 OHM 0805 SMD Steward(R) Inc. 1 PCB RoHS Compliant Bare PCB, MCP355X Tiny Application Sensor Demo Board. - 104-00093 2 R1, R2 NOT INSTALLED Open RES0805 1 R3 RES 1.00K OHM 1/10W 1% 0805 SMD Panasonic - ECG ERJ-6ENF1001V 1 R4 RES 100 OHM 1/10W 1% 0805 SMD Panasonic - ECG ERJ-6ENF1000V 1 U1 LM4140 IC VOLT REF PREC MICROPWR 8-SOIC National Semiconductor(R) LM4140CCM-4.1/NOPB 1 U2 PIC18F4550 Microchip Technology PIC18F4550-I/PT 1 U3 SM5420 is an SO-8 packaged 15 PSI pressure sensor. Silicon Microstructures, Inc. SM5420-015-A-H-T 1 U4 MCP3551_MSOP Microchip Technology MCP3551-E/MS 1 Y1 CRYSTAL 20MHZ METAL CASE SMD Connor-Winfield XM-1-20.0000 2 Z1, Z2 RES 10.0K OHM 1/10W 1% 0805 SMD Panasonic - ECG ERJ-6ENF1002V 1 Z3 RES 0.0 OHM 1/8W 5% 0805 SMD Panasonic - ECG ERJ-6GEY0R00V 3 Z4, Z6, Z7 NOT INSTALLED Open RES0805_MCHIP (c) 2006 Microchip Technology Inc. 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