MICROCHIP MCP355X Technical data

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MCP355X

Tiny Application Sensor

Demo Board User’s Guide

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8-bit MCUs, KEELOQ

code hopping devices, Serial

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

MCP355X Tiny Application Sensor Demo Board User’s Guide

NOTES:

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.

MCP355X Tiny Application Sensor Demo Board User’s Guide

CONVENTIONS USED IN THIS GUIDE

This manual uses the following documentation conventions:

DOCUMENTATION CONVENTIONS

Description Represents Examples

Arial font:

Italic characters Referenced books MPLAB

Emphasized text ...is the only compiler...

Initial caps A window the Output window

A dialog the Settings dialog A menu selection select Enable Programmer

Quotes A field name in a window or

dialog

Underlined, italic text with right angle bracket

Bold characters A dialog button Click OK

N‘Rnnnn A number in verilog format,

Text in angle brackets < > A key on the keyboard Press <Enter>, <F1>

Courier New font:

Plain Courier New Sample source code #define START

Italic Courier New A variable argument file.o, where file can be

Square brackets [ ] Optional arguments mcc18 [options] file

Curly brackets and pipe character: { | }

Ellipses... Replaces repeated text var_name [,

A menu path File>Save

A tab Click the Power tab

where N is the total number of digits, R is the radix and n is a digit.

Filenames autoexec.bat File paths c:\mcc18\h Keywords _asm, _endasm, static Command-line options -Opa+, -Opa- Bit values 0, 1 Constants 0xFF, ‘A’

Choice of mutually exclusive arguments; an OR selection

Represents code supplied by user

“Save project before build”

4‘b0010, 2‘hF1

any valid filename

[options] errorlevel {0|1}

var_name...] void main (void)

{ ... }

IDE User’s Guide

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:

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• 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

Preface

DOCUMENT REVISION HISTORY

Revision A (April 2006)

• Initial Release of this Document.

MCP355X Tiny Application Sensor Demo Board User’s Guide

NOTES:

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 V 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

as V

. The MCP355X Tiny Application Sensor Demo

REF

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

MCP355X Tiny Application Sensor Demo Board User’s Guide

NOTES:

Chapter 2. Installation and Operation

2.1 INTRODUCTION

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.

MCP355X TINY APPLICATION SENSOR

DEMO BOARD USER’S GUIDE

350Ω

SM5420 Absolute Pressure Sensor

MCP355X Tiny Application Sensor Demo Board

350Ω

Input Filtering

FIGURE 2-1: Ratiometric Sensor Configuration.

2.2 FEATURES

REF

MCP3551

SCK

SDO

PS Filtering

PIC18F4550

USB

USB interface to DataView on PC

for noise analysis

Analog

Digital

PC Running

DataView

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

MCP355X Tiny Application Sensor Demo Board User’s Guide

Power Supply

Filtering

Analog

Ground

Plane

SM5420

USB Power (Digital)

Digital Ground

PIC18F4550

Analog Power & Reference

Filter Network

FIGURE 2-2: Block Diagram.

2.3 FUNCTIONAL BLOCK DESCRIPTIONS

USB Connector

USB Power & Data

JP1

Plane

MCP3551

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 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.

flag

Installation and Operation

-10

-20

-30

-40

-50

-60

-70

-80

-90

Attenuation (dB)

-100

-110

-120 0 102030405060708090100110

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® microcontroller is used to connect to the PC and quickly evaluate system performance. An In-Circuit Serial Programming™ (ICSP™) 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:

AvDD , V

10 μF

REF

USB Power Supply

10 μH

1kΩ

10 μF

Digital

100Ω

Analog

2.3.5 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.

MCP355X Tiny Application Sensor Demo Board User’s Guide

2σ σ

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: DataView Scope Plot View.

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

MCP355X Tiny Application Sensor Demo Board User’s Guide

A.3 BOARD - SCHEMATIC

A.4 BOARD LAYOUT - TOP LAYER

Schematic and Layouts

BOARD EDGE

MCP355X Tiny Application Sensor Demo Board User’s Guide

A.5 BOARD LAYOUT - BOTTOM LAYER

MCP355X TINY APPLICATION SENSOR

DEMO BOARD USER’S GUIDE

Appendix B. Bill Of Materials (BOM)

TABLE B-1: BILL OF MATERIALS (BOM)

Qty Reference Description Manufacturer Part Number

1 C1 CAP .47UF 16V CERAMIC X7R 0805 Panasonic

1 C2 CAP 1.0UF 10V CERAMIC X7R 0805 Kemet® Electronics C0805C105K8RACTU

3 C3, C9,

C10

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)

1 JMP1 3PIN, .100" Straight Male Headers

1 JMP1

Shunt

2 JP1, JP2 NOT INSTALLED – -

2 L1, L2 FERRITE 500MA 600 OHM 0805 SMD Steward

1 PCB RoHS Compliant Bare PCB, MCP355X

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

1 U2 PIC18F4550 Microchip Technology PIC18F4550-I/PT

1 U3 SM5420 is an SO-8 packaged 15 PSI

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

CAP .1UF 25V CERAMIC X7R 0805 Panasonic - ECG ECJ-2VB1E104K

Value-Pro JS1109-6-R

.025"PST,.23GOLDTAIL

Value-Pro 7000-1X3SG-R

(Gold)

SHUNT LP W/HANDLE 2 POS 30AU AMP

– 104-00093

Tiny Application Sensor Demo Board.

National Semiconductor

MICROPWR 8-SOIC

Silicon Microstructures, Inc. SM5420-015-A-H-T

pressure sensor.

- ECG ECJ-2YB1C474K

/Tyco® Electronics 881545-2

Inc. HZ0805E601R-10

LM4140CCM-4.1/NOPB

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02/16/06

MICROCHIP MCP355X Technical data

Specifications and Main Features

Frequently Asked Questions

User Manual

Preface

INTRODUCTION

DOCUMENT LAYOUT

CONVENTIONS USED IN THIS GUIDE

RECOMMENDED READING

THE MICROCHIP WEB SITE

CUSTOMER SUPPORT

DOCUMENT REVISION HISTORY

Chapter 1. Product Overview

1.1 INTRODUCTION

1.2 WHAT IS THE MCP355X TINY APPLICATION SENSOR DEMO BOARD?

1.3 WHAT THE MCP355X TINY APPLICATION SENSOR DEMO BOARD KIT INCLUDES

Chapter 2. Installation and Operation

2.1 INTRODUCTION

2.2 FEATURES

2.3 FUNCTIONAL BLOCK DESCRIPTIONS

Appendix A. Schematic and Layouts

A.1 INTRODUCTION

A.2 SCHEMATICS AND PCB LAYOUT

Appendix B. Bill Of Materials (BOM)

WORLDWIDE SALES AND SERVICE