User manual

PT100 RTD EVALUATION

BOARD USER’S GUIDE

Chapter 1. Product Overview

1.1 INTRODUCTION

This chapter provides an overview of the PT100 RTD Evaluation Board and covers the

following topics:

• What is the PT100 RTD Evaluation Board?

• What the PT100 RTD Evaluation Board kit includes.

1.2 WHAT IS THE PT100 RTD EVALUATION BOARD?

The PT100 RTD Evaluation Board demonstrates how to bias a Resistive Temperature

Detector (RTD) and accurately measure temperature. Up to two RTDs can be

connected. The RTDs are biased using constant current source and the output voltage

is scaled using a difference amplifier. In addition to the difference amplifier, a multiple

input channel Programmable Gain Amplifier (PGA) MCP6S26 is used to digitally switch

between RTDs and increase the scale up to 32 times.

The output of the difference amplifier is connected to a 12-bit differential

Analog-to-Digital Converter (ADC) MCP3301. The ADC outputs serial data to the

PIC18F2550 using a Serial Peripheral Interface (SPI). The data is transmitted to a PC

using a USB interface.

A PC Software Graphical User Interface (GUI) is used to acquire the data. The acquired

data is graphed as a real-time stripchart display. In addition, the user can select input

channels, acquisition interval, and stripchart display buffer size.

1.3 WHAT THE PT100 RTD EVALUATION BOARD KIT INCLUDES

This PT100 RTD Evaluation Board Kit includes:

• The PT100 RTD Evaluation Board (102-00096)

• PIC18F2550 Firmware (USB)

• PC Software GUI

• Analog and Interface Products Demonstration Boards CD-ROM (DS21912)

- PT100 RTD Evaluation Board User’s Guide (DS51607)

• Mini-USB Cable