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PIC18F87J72 EVALUATION BOARD
USER ’S GUIDE
Chapter 1. Product Overview
1.1
1.2
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
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.
? 2011 Microchip Technology Inc.
DS51990A-page 9
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