TMPSNSRD-TCPL1 Datasheet TMPSNSRD-TCPL1 | P7-P9

Preface

RECOMMENDED READING

This user's guide describes how to use Thermocouple Reference Design. Other useful

documents are listed below. The following Microchip documents are available and

recommended as supplemental reference resources.

MCP3421 Data Sheet, “18-Bit Analog-to-Digital Converter with I

C Interface and

On-Board Reference“ (DS22003).

This data sheet provides detailed information regarding the MCP3421 device.

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

Customers should contact their distributor, representative or field application engineer

(FAE) 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 (December 2009)

• Initial Release of this Document.

Thermocouple Reference Design

NOTES:

THERMOCOUPLE

REFERENCE DESIGN

Chapter 1. Product Overview

1.1 INTRODUCTION

The following name and assembly number are found on the Thermocouple Reference

Design’s Printed Circuit Board (PCB):

• 102-00114

1.2 WHAT IS THE THERMOCOUPLE REFERENCE DESIGN?

The Thermocouple Reference Design demonstrates how to instrument a

Thermocouple and accurately sense temperature over the entire Thermocouple

measurement range. This solution uses the MCP3421 18-Bit Analog-to-Digital

Converter (ADC) to measure voltage across the Thermocouple. The ADC has an

internal 2.048V reference voltage and a Programmable Gain Amplifier with

1, 2, 4, 8V/V. At a Gain of 8V/V the PGA effectively adds 3LSb to the ADC. This

increases the ADC resolution to 21-bit or 2 µV/LSb. Therefore, the Thermocouple EMF

voltage is measured with 2 µV resolution. For K-type Thermocouple, measurement

system provides a ±0.05°C resolution. The cold-junction compensation is done using

a ±1°C accurate 0.0625°C resolution silicon temperature sensor, the MCP9804. This

solution provides a reliable and accurate Thermocouple instrumentation without the

need for extensive circuit compensation and calibration routines.

The ADC output is read using a PICmicro Microcontroller. This controller is also

connected to a PC using USB interface. The Thermal Management software is used to

plot the Thermocouple temperature data in stripchart format.

1.3 WHAT THE THERMOCOUPLE REFERENCE DESIGN KIT INCLUDES

This Thermocouple Reference Design Kit includes:

• Thermocouple Reference Design, 102-00114

• K-type Thermocouple

• Important Information Sheet

P1-P3 P4-P6 P7-P9 P10-P12 P13-P15 P16-P18 P19-P21 P22-P22

TMPSNSRD-TCPL1

Mfr. #:

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Description:

Sensor Development Tools Temperature Sensor Development Tools Thermocouple Ref Design Board

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TMPSNSRD-TCPL1