MCP3421DM-WS 查看數據表（PDF） - Microchip Technology

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MCP3421DM-WS

MCP3421 Weight Scale Demo Board User’s Guide

Microchip Technology 

MCP3421 WEIGHT SCALE

DEMO BOARD USER’S GUIDE

Chapter 1. Product Overview

1.1 OVERVIEW

The MCP3421 Weight Scale Demo Board works with the LabVIEW™ Graphical User

Interface (GUI) PC Software. This demo board demonstrates how to use the MCP3421

18-bit Delta-Sigma ADC for weight scale applications. It uses the PIC18F4550 micro-

controller for data processing and USB communication with PC. This board also dem-

onstrates the changes in the system performance by adjusting the parameters of the

sensor signal conditioning circuits using the MCP6V07 auto-zeroed op amp.

1.1.1 Feature Highlights

• The LCD displays the user’s selected option and the ADC output code or the

calculated results.

• The user can select the signal averaging factor (1 or 4) by pressing the S3 button.

The selected option is displayed on the LCD.

• System performance analysis using PC GUI: the interface allows various

interactive post signal processing, such as standard deviations and histogram.

• Hardware PCB design examples: this demo board utilizes a robust grounding

method of analog circuits in PCB design. It also demonstrates how to split analog

and digital ground planes.

• Signal conditioning examples using MCP6V07: the low-noise op amp is used to

boost input signal levels.

• 2 Kg load cell with 1 mV/V sensitivity.

FIGURE 1-1:

 2010 Microchip Technology Inc.

MCP3421 Weight Scale Demo Board.

DS51918A-page 9

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