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PICDEM TM LAB DEVELOPMENT
BOARD USER ’S GUIDE
Chapter 4. Comparator Peripheral Labs
4.1
4.2
INTRODUCTION
The following labs cover some of the fundamental features of the Comparator 1
peripheral found on the PIC16F690 including some unique applications. These
peripherals are very useful mixed signal building blocks as they provide analog
functionality independent of program execution. The labs in this section will
demonstrate this functionality, then introduce intelligence to implement a relatively high
resolution temperature sensor measurement application.
COMPARATOR LABS
4.2.1
Reference Documentation
All documentation is available on the PICDEM? Lab Development Kit accompanying
CD-ROM:
? PIC16F690 Data Sheet (DS41262)
- Section 4.0: I/O Ports
- Section 5.0: Timer0 Module
- Section 6.0: Timer1 Module
- Section 8.0: Comparator Module
? “Introduction to MPLAB ? IDE and HI-TECH C ? PRO for the PIC10/12/16 MCU
Family Lite Mode Compiler Tutorial” (DS41322)
4.2.2
Comparator Labs
The labs that will be implemented in this chapter are:
? Lab 1: Simple Comparator
? Lab 2: Using the Internal Comparator Voltage Reference
? Lab 3: Higher Resolution Sensor Readings Using a Single Comparator
4.2.3
Equipment Required
To complete the labs in this section, the following components are required:
1.
2.
3.
4.
5.
6.
7.
8.
2 – 10 K Ω resistors
4 – 470 Ω resistor
1 – 100 K Ω potentiometer
4 – Light Emitting Diodes
1 – 1N4148 diodes
1 – 1 μ F capacitor
PIC16F690 populating socket U2
Assorted jumper wires
? 2009 Microchip Technology Inc.
DS41369A-page 61
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