User manual

PIC18F87J72 EVALUATION BOARD

USER’S GUIDE

Chapter 1. Product Overview

1.1 INTRODUCTION

This chapter provides an overview of the PIC18F87J72 Evaluation Board. This board

is used as a development tool and as evaluation kit for PIC18F87J72 based

applications.

Topics discussed in this chapter include:

• Development Kit Contents

• Evaluation Board Functionality and Features

1.2 PIC18F87J72 EVALUATION BOARD FUNCTIONALITY AND FEATURES

The PIC18F87J72 Evaluation Board provides a platform for developing and evaluating

applications which are based on the PIC18F87J72 device. These applications can

range from accurate measurement of low signals like an output signal of a load cell to

processing of information for metering and other metrology applications like energy

metering, heatmeter and so on.

The PIC18F87J72 microcontroller has an 8-bit core processor along with many

advanced peripherals like 12-bit SAR-based ADC, two 24-bit delta sigma ADCs and

Charge Time Measurement unit (CTMU) for temperature measurement or

implementation of touch keys.

PIC18F87J72 also has built-in Real Time Clock and Calendar (RTCC) with calibration

registers for time stamping the measured data, and a Liquid Crystal Display (LCD)

driver for a display up to 132 pixels.

The PIC18F87J72 Evaluation Board has the following features to develop and test user

applications:

• Easy connection for low and high voltage signals. Signals from variety of sensors

can be connected to this board.

• Touch keys to select different parameters of the of the 24-bit Delta Sigma ADC,

like Over Sampling Ratio (OSR), Resolution, and Channel gain.

• Direct LCD display, driven from the COM/SEG pins of PIC18F87J72

• Real Time Clock

• Temperature Measurement option with CTMU

The PIC18F87J72 Evaluation Board can be connected to the GUI, supplied along with

the board, to analyze the synchronous sampling, 24-bit, delta sigma ADCs. The ADCs

have 90 dB SINAD and -104dB THD (up to the 35th harmonic) for each channel,

enabling highly accurate energy metering and other low signal level designs. With less

than 10 mVRMS output noise and a programmable gain amplifier of up to 32 V/V, these

24-bit ADCs are capable of interfacing to a large variety of small signal sensors, as well

as voltage and current sensors, including shunts, Current Transformers (CT),

Rogowski coils, Hall Effect sensors and load cells.