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2019 Microchip Technology Inc.DS00003183A-page 1

AN3183

INTRODUCTION

This application note describes a weight scale design

using Microchip's MCP3564 24-bit Delta-Sigma

Analog-to-Digital Converter (ADC) and PIC24

microcontroller. The weight scale uses an automatic

calibration process and techniques to minimize power

consumption. The design takes advantage of the

ADC's dynamic reconfigurability features of

oversampling ratio (OSR) and Gain settings to

demonstrate the impact of certain configurations on the

precision and the accuracy of the device. These

settings can be made from a dedicated graphical user

interface (GUI) which also allows the calibration of the

weight scale and much more.

Starting from the sensor (the load cell) and its

specifications and ending with the digital filter

implementation, this application note provides

information about each feature of the weight scale and

their importance in the application.

WEIGHT SCALE SYSTEM DIAGRAM

Figure 1shows the weight scale demo using the

MCP3564 24-bit Delta-Sigma ADC. Figure 2 shows an

example of weight scale system diagram, containing

the front end load cell circuit, gain amplifier, MCP3564

Delta-Sigma ADC and PIC24 16-bit microcontroller

(MCU).

FIGURE 1:Photo of the MCP3564

Weight Scale Demo, P/N ARD00906.

FIGURE 2:Weight Scale Block Schematic.

Author:Dana Diaconu,

Microchip Technology Inc.

AVDD

AGND

OUT+

OUT- MCP3564 MCU

(PIC24FJ256GB410)

CH0

CH1 SPI

CH2

CH3

Low Noise

Differential

Amplifier

VREF+

VREF-

/RDG&HOO

Weightale Application using Sc

MCP3564 24-it Delta-Sigma ADCB

Product specificaties