1818281+1818282 Microchip Technology, 1818281+1818282 Datasheet - Page 37

• Manufacturer Part Number: 1818281+1818282
• Description: EDF / AMICUS18 + SHIELD, BUNDLE
• Manufacturer: Microchip Technology
• Type: Development Boardr

Specifications of 1818281+1818282

• Kit Contents: Board
• Svhc: No SVHC (15-Dec-2010)
• Kit Features: Nine 10-bit ADC Inputs, Two 10-bit PWM Outputs, Two Comparators
• Mcu Supported Families: PIC18F25K20
• Silicon Manufacturer: Microchip
• Core Architecture: PIC
• Core Sub-architecture: PIC18
• Silicon Core Number: PIC18F
• Silicon Family Name: PIC18FxxKxx

Amicus18 Companion Shield
Temperature Sensor
One of the simplest, and least expensive, temperature sensors is a thermistor. This is a special type of
resistor that alters it’s resistance based upon it’s temperature. There are generally two types of thermis-
tor; an NTC type (Negative Temparature Coefficient), whose resistance drops as the temparature in-
creases, and a PTC type (Positive Temparature Coefficient), whose resistance increases as the tempara-
ture increases. For this demonstration, we’ll use an NTC thermistor.
Just like there fixed resistance cousins, thermistors come in different packages and resistance-per-
temperature values. These range anywhere from a few hundred Ohms to tens of thousands of Ohms.
The device used in this demonstration is a bead thermistor with a resistance of 10KΩ at a temperature
o
centigrade, but any thermistor will do with a few program code changes.
of 25
A thermistor layout is shown below:
36
Crownhill AssociatesLimited 2009 - All Rights Reserved
Version 1.0
06-10-2009