Datasheet

MCP3901 LOW-COST POWER
MONITOR USER’S GUIDE
 2010 Microchip Technology Inc. DS51915A-page 3
Table of Contents
Preface ........................................................................................................................... 5
Introduction............................................................................................................ 5
Document Layout .................................................................................................. 5
Conventions Used in this Guide ............................................................................ 6
Recommended Reading........................................................................................ 7
The Microchip Web Site ........................................................................................ 7
Customer Support ................................................................................................. 7
Document Revision History ................................................................................... 7
Chapter 1. Product Overview
1.1 Overview ........................................................................................................ 9
1.2 Analog Input Circuit ...................................................................................... 10
1.3 Power Circuit ................................................................................................ 10
1.4 PIC18F25K20 Microcontroller and Liquid Crystal Display (LCD) ................. 10
Chapter 2. Installation and Operation
2.1 Power Monitor Firmware Description ........................................................... 11
2.2 Calibration Procedure ................................................................................... 18
Appendix A. Schematics and Layouts
A.1 Board Schematic – Analog and Power ........................................................ 22
A.2 Board Schematic – Microcontroller and LCD ............................................... 23
A.3 Board Schematic – Universal Serial Bus ..................................................... 24
A.4 Board – Top Trace and Top Silk .................................................................. 25
A.5 Board – Bottom Trace and Bottom Silk ........................................................ 25
Appendix B. Bill of Materials
Worldwide Sales and Service .................................................................................... 30