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AN897 Datasheet(PDF) 11 Page - Microchip Technology

Part # AN897
Description  Thermistor Temperature Sensing with MCP6SX2 PGAs
PDF  16 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

AN897 Datasheet(HTML) 11 Page - Microchip Technology

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 2004 Microchip Technology Inc.
DS00897B-page 11
AN897
APPENDIX A:
SET-UP OVERVIEW
A.1
Thermistor PGA PICtail Daughter
Board
The Thermistor PGA PICtail Daughter Board contains
the analog circuitry represented in Figure A-1. The
thermistor converts its temperature to a resistance. The
voltage divider then converts that resistance to voltage
and sends it to the CH0 input of the PGA. The PGA
gains and buffers this voltage and sends it off-board.
Board power is applied at the +5V and GND inputs. The
SPI™ bus makes it possible to control the PGA; its gain
and input channel can be set as desired from the
software.
FIGURE A-1:
Thermistor PGA PICtail™
Daughter Board Block Diagram.
The test points make it easier to test key points in the
circuit, change the input signals and to use this board
as a stand-alone board.
• GND Test Point – Connected to the ground plane
and is a convenient ground point for any lab
equipment
• +5V Test Point – Allows measurement of the
positive supply voltage and provides a means to
power this board with a laboratory power supply
• CH0 Test Point – The place to measure the volt-
age divider’s output (also the PGA’s CH0 input)
• CH1 Test Point – Makes it possible to send any
desired signal to the PGA
More detail on setting up this demonstration board can
be found in the “Thermistor PGA PICtail™ Daughter
Board User’s Guide” [12].
A.2
Associated Tools
Figure A-2 shows the block diagram of the hardware
and software tools that the Thermistor PGA PICtail™
Daughter Board is designed to work with. More
information on these tools can be found in the
“References” section.
FIGURE A-2:
Measurement Setup Block
Diagram.
Temperature
CH1 Input
Thermistor
Voltage
Divider
PGA
MCP6S22
Thermistor PGA
PICtail™ Daughter Board
VOUT
SPI™ Bus
4
CH0 Input
+5V
GND
GND
+5V
Test Point
Test Point
Test Point
Test Point
PC
USB
Signal Analysis
PICtail Daughter Board
PICkit™ 1
Flash Starter Kit
14
Thermistor PGA
PICtail™ Daughter Board
PICkit 1 Signal Analysis
PC Program
14
PICkit 1
Firmware
PICA2Dlab.hex
Firmware
Hardware
Software



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