Microchip PIC18F26K83 Manual

Microchip Ikke kategoriseret PIC18F26K83

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TB3194

PIC16/PIC18 ADC² Technical Brief

Introduction

Author: Christopher Best, Microchip Technology Inc.

An Analog-to-Digital Converter (ADC) converts an analog input signal into a digital number representing

the magnitude of the input voltage. Microchip’s 12-bit ADC with Computation (ADC 2) outputs a 12-bit

binary representation of the original signal and adds special hardware features to provide post-processing

functions that can be performed on the conversion result.

This technical brief provides an overview of the basic ADC features and functions, and describes the

additional computation features that are not found in other ADC modules. This document will not cover

the Capacitive Voltage Divider (CVD) feature, which is covered in TB3198, but may refer to CVD in

general terms. This technical brief will cover the ADC2 module found in Microchip’s PIC16 and PIC18 8-

bit architecture.

Table of Contents

Introduction......................................................................................................................1

1. ADC Module Overview.............................................................................................. 3

1.1. ADC Block.................................................................................................................................... 3

1.1.1. ADC Inputs.................................................................................................................... 3

1.1.2. ADC Voltage Reference.................................................................................................5

1.1.3. ADC Charge Pump........................................................................................................ 6

1.1.4. ADC Conversion Clock..................................................................................................6

1.1.5. Continuous Sampling Mode...........................................................................................7

1.1.6. Double Sample Conversion Mode................................................................................. 8

1.1.7. Auto-Conversion Trigger................................................................................................8

1.1.8. Conversion Result Formatting....................................................................................... 8

1.1.9. ADC Conversion Interrupt..............................................................................................9

1.1.10. Sleep Mode....................................................................................................................9

1.2. Computation............................................................................................................................... 10

1.2.1. Basic Mode..................................................................................................................10

1.2.2. Accumulate Mode........................................................................................................10

1.2.3. Average Mode..............................................................................................................11

1.2.4. Burst Average Mode.................................................................................................... 11

1.2.5. Low-Pass Filter Mode..................................................................................................12

1.3. Threshold Comparison............................................................................................................... 17

2. Conclusion...............................................................................................................20

3. Appendix A: Basic Analog Terminology...................................................................21

The Microchip Web Site................................................................................................ 24

Customer Change Notification Service..........................................................................24

Customer Support......................................................................................................... 24

Microchip Devices Code Protection Feature................................................................. 24

Legal Notice...................................................................................................................25

Trademarks................................................................................................................... 25

Quality Management System Certified by DNV.............................................................26

Worldwide Sales and Service........................................................................................27

TB3194

Produkt Specifikationer

Mærke:	Microchip
Kategori:	Ikke kategoriseret
Model:	PIC18F26K83

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