User manual

PT100 RTD Evaluation Board User’s Guide
DS51607B-page 8 © 2007 Microchip Technology Inc.
2.3 GETTING STARTED
This section describes how to quickly configure the PT100 RTD Evaluation Board. A
simplified block diagram of the configuration is provided in Figure 2-1.
FIGURE 2-1: PT100 RTD Evaluation Board Simplified Block Diagram.
2.3.1 Hardware Setup
1. Connect the USB cable to PC.
2. To measure PCB temperature, connect JP1 to Local RTD position and JP2 to
RTD position.
FIGURE 2-2: Simplified PT100 RTD Evaluation Board Schematic.
PC
USB
PICmicro
®
Microcontroller
V
REF
ADC
CH1
CH0
Diff Amp
PT100 RTD Evaluation Board
RTD
RTD
V
REF
ADC
CH1
CH0
RTDs
PIC18F2550
3
SPI
MCP3301
3
SPI
Differential
V
DD
V
DD
3
SPI
3
SPI
PGA
MCP6S26
3
SPI
JP1
Amplifier
+
–
+
–