Microchip Technology PIC18F87J72 User guide

PIC18F87J72

Evaluation Board

User’s Guide

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EELOQ, KEELOQ logo, MPLAB, PIC, PICmicro, PICSTART,

PIC

logo, rfPIC and UNI/O are registered trademarks of Microchip Technology Incorporated in the U.S.A. and other countries.

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All other trademarks mentioned herein are property of their respective companies.

Printed on recycled paper.

ISBN: 978-1-61341-304-3

Microchip received ISO/TS-16949:2002 certification for its worldwide headquarters, design and wafer fabrication facilities in Chandler and Tempe, Arizona; Gresham, Oregon and design centers in California and India. The Company’s quality system processes and procedures are for its PIC devices, Serial EEPROMs, microperipherals, nonvolatile memory and analog products. In addition, Microchip’s quality system for the design and manufacture of development systems is ISO 9001:2000 certified.

MCUs and dsPIC® DSCs, KEELOQ

code hopping

PIC18F87J72 EVALUATION BOARD

USER’S GUIDE

Preface ........................................................................................................................... 5

Introduction............................................................................................................ 5

Document Layout .................................................................................................. 6

Recommended Reading........................................................................................ 7

The Microchip Web Site ........................................................................................ 7

Customer Support ................................................................................................. 8

Document Revision History ................................................................................... 8

Chapter 1. Product Overview

1.1 Introduction ..................................................................................................... 9

1.2 PIC18F87J72 Evaluation Board Functionality and Features .......................... 9

1.3 PIC18F87J72 EVALUATION BOARD KIT CONTENTS .............................. 10

Chapter 2. Hardware Description

2.1 Introduction ................................................................................................... 11

Chapter 3. PIC18F87J72 Evaluation Board Features

3.1 Introduction ................................................................................................... 17

Chapter 4. PIC18F87J72 Evaluation Board Firmware Flowchart

4.1 Introduction ................................................................................................... 23

Chapter 5. PIC18F87J72 Evaluation Board Lab Test Results

5.1 Introduction ................................................................................................... 31

Chapter 6. PIC18F87J72 Evaluation Board GUI

6.1 Introduction ................................................................................................... 35

PIC18F87J72 EVALUATION BOARD USER’S GUIDE

Appendix A. Schematics and Layouts

A.1 Introduction .................................................................................................. 37

A.2 Board – Schematic 1 .................................................................................... 38

A.3 Board – Schematic 2 ................................................................................... 39

A.4 Board – Schematic 3 .................................................................................... 40

A.5 Board – Schematic 4 .................................................................................... 41

A.6 Board – PCB Front Page ............................................................................. 42

A.7 Board – PCB Top Silk ................................................................................. 43

A.8 Board – PCB Top Layer ............................................................................... 44

A.9 Board – PCB Bottom Layer .......................................................................... 45

A.10 Board – PCB Bottom Silk ........................................................................... 46

A.11 Board – PCB L1 Ground ............................................................................ 47

A.12 Board – PCB L2 VDD ................................................................................ 48

Appendix B. Bill of Materials (BOM)

Worldwide Sales and Service .....................................................................................52

PIC18F87J72 EVALUATION BOARD

USER’S GUIDE

Preface

NOTICE TO CUSTOMERS

All documentation becomes dated, and this manual is no exception. Microchip tools and documentation are constantly evolving to meet customer needs, so some actual dialogs and/or tool descriptions may differ from those in this document. Please refer to our web site (www.microchip.com) to obtain the latest documentation available.

Documents are identified with a “DS” number. This number is located on the bottom of each page, in front of the page number. The numbering convention for the DS number is “DSXXXXXA”, where “XXXXX” is the document number and “A” is the revision level of the document.

For the most up-to-date information on development tools, see the MPLAB Select the Help menu, and then Topics to open a list of available on-line help files.

IDE on-line help.

INTRODUCTION

This chapter contains the general information that will be useful to know before using the PIC18F87J72 Evaluation Board. Items discussed in this chapter include:

• Document Layout

• Recommended Reading

• The Microchip Web Site

• Customer Support

• Document Revision History

PIC18F87J72 Evaluation Board User’s Guide

DOCUMENT LAYOUT

This document describes how to use the PIC18F87J72 Evaluation Board as a development tool to emulate and debug firmware on a target board. The manual layout is as follows:

• Chapter 1. “Product Overview” – Provides a brief overview of the PIC18F87J72

Evaluation Board, its features and uses.

• Chapter 2. “Hardware Description” – Provides a detailed description of the

PIC18F87J72 Evaluation Board hardware features.

• Chapter 3. “PIC18F87J72 Evaluation Board Features” – Provides details on

how to use and configure the PIC18F87J72 Evaluation Board.

• Chapter 4. “PIC18F87J72 Evaluation Board Firmware Flowchart” – Provides

the flow charts for various functions and routines in the firmware.

• Chapter 5. “PIC18F87J72 Evaluation Board Lab Test Results” – Provides the

various lab test results obtained when working on a debugging environment using MPLAB

• Chapter 6. “PIC18F87J72 Evaluation Board GUI” – Provides details on the

Graphical User Interface (GUI) used for plotting the various signals in time and frequency domain for spectral analysis.

• Appendix A. “Schematics and Layouts” – Provides schematic and board

layouts of the PIC18F87J72 Evaluation Board.

• Appendix B. “Bill of Materials (BOM)” – Provides details of all the components

with part numbers and designators used for the PIC18F87J72 Evaluation Board.

IDE.

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.

PIC18F87J72 Evaluation Board User’s Guide

1.3 PIC18F87J72 EVALUATION BOARD KIT CONTENTS

This PIC18F87J72 Evaluation Board kit includes:

• PIC18F87J72 Evaluation Board

• Pre-Programmed PIC18F87J72 microcontroller on board

• MCP2200 device on board

•GUI

• LAB VIEW installation software for the GUI

- Visa 441 runtime

- LVRTE86std

• Mini Universal Serial Bus (USB) connecting cable

Chapter 2. Hardware Description

2.1 INTRODUCTION

This chapter describes the various sections of the hardware present on the evaluation board. It also describes the different configurations possible for operating the evaluation board, depending upon the input voltage and current specifications. Figure 2-1 shows the overall layout of the PIC18F87J72 Evaluation Board where the different hardware sections are indicated by numbers. Table 2-1 lists the descriptions for each hardware component.

PIC18F87J72 EVALUATION BOARD

USER’S GUIDE

Legend:

1 PIC18F87J72 microcontroller 8 9V battery connector

2 Seven segment LCD 9 MCP2200 – USB to Universal Asynchronous receiver/transmitter (UART)

3 High voltage section with connectors 10 Mini B USB receptacle

4 RJ11 connector 11 9V power supply jack

5 Load Cell connector 12 32.768 kHz crystal

6PICtail

7 Touch sensitive keys

™

connector 13 10 MHz crystal

serial converter

FIGURE 2-1: Layout of the PIC18F87J72 Evaluation Board.

PIC18F87J72 Evaluation Board User’s Guide

TABLE 2-1: BOARD LAYOUT AND COMPONENTS

1 PIC18F87J72 microcontroller Main controller for all functions on the board

2 Seven segment LCD To display time and other configuration features like OSR,

3 High voltage section with connectors For connecting universal input voltage to the board (when not

4 RJ11 connector For debugging and programming purpose

5 Load Cell connector Optional provision to connect an external load cell output to the

6PICtail™ connector To connect to other application-specific daughter cards

7 Touch sensitive keys Touch sense switches for changing configuration of

8 9V battery connector To connect a 9V battery when powering the board through it

9 MCP2200 – USB to UART serial converter To communicate with the GUI

10 Mini B USB receptacle To connect the USB port of the computer to the evaluation

11 9V power supply jack 9V power supply to the board

12 32.768 kHz crystal Clock to the internal Real-Time Clock and Calendar (RTCC)

13 10 MHz crystal External Clock to the main controller

Section or Component Functionality

Gain, Bit Width

using 9V supply or battery)

ADC input channels

Sigma-Delta ADC

board

2.1.1 PIC18F87J72 Evaluation Board Jumper Settings

Table 2-2 shows the various jumpers available on the PIC18F87J72 Evaluation Board. By connecting the jumper pins appropriately, different configurations can be achieved on the board. Care must be taken regarding the voltage level before placing these jumpers. Further sections in this document describe what precautions need to be ensured while connecting these jumpers.

TABLE 2-2: JUMPERS ON THE EVALUATION BOARD

SI NO Device Description

1 JP1 Selection between high voltage and low voltage input on channel CH0

2 JP2 To ground Pin 1 of J4

3 JP3 Used for burden connections when CT output is connected to J4

4 JP4 To ground Pin 3 of J4

5 JP5 To ground Pin 1 of J5

6 JP6 Used for burden connections when CT output is connected to J5

7 JP7 To ground Pin 3 of J5

8 JP8 Selection between high voltage and low voltage input on channel CH1

Hardware Description

2.1.2 Measurement of High Voltages

The circuit diagrams in the schematics section of Appendix A. “Schematics and Layouts”, provide details on the resistor values used for dividing the network of the input

voltage. Table 2-3 provides a quick reference to resistor values in the high voltage section.

TABLE 2-3: RESISTORS FOR HIGH VOLTAGE MEASUREMENT

R23 and R30 330

R24 and R31 330

R25 and R32 120

R33 and R35 1

R37 and R39 1

When measuring a high voltage signal on the input terminals of channels CH0 and CH1, refer to Table 2-4 and Table 2-5. These tables provide the configuration of jumpers, along with the amplitude of the voltage available at the various points. The high voltage can be in the universal range of input voltage ranging from 85-265 Volts (Vrms) at 50 Hz or 60 Hz.

rms

TABLE 2-4: JUMPER SETTINGS FOR HIGH VOLTAGE MEASUREMENT ON CH0

CH0 Jumper Position ADC

Voltage

(Vrms)

80 Short 1-2 Open Open Short 0.10230 0.14468 Internal Gain of 2 can be used

110 Short 1-2 Open Open Short 0.14066 0.19893

220 Short 1-2 Open Open Short 0.28133 0.39786

270 Short 1-2 Open Open Short 0.34527 0.48828

280 Short 1-2 Open Open Short 0.35806 0.50637 Max Differential ADC I/P is 0.5V

JP1 JP2 JP3 JP4

ADC I/P

(Vrms)

ADC I/P (Vpeak)

for better resolution

Remark

TABLE 2-5: JUMPER SETTINGS FOR HIGH VOLTAGE MEASUREMENT ON CH1

CH1 Jumper Position ADC

Volta ge

(Vrms)

80 Short 1-2 Open Open Short 0.10230 0.14468 Internal Gain of 2 can be used

110 Short 1-2 Open Open Short 0.14066 0.19893

220 Short 1-2 Open Open Short 0.28133 0.39786

270 Short 1-2 Open Open Short 0.34527 0.48828

280 Short 1-2 Open Open Short 0.35806 0.50637 Max Differential ADC I/P is 0.5V

Note 1: The precautions given need to be strictly adhered to, in order to avoid any damage to the evaluation

2: Input high voltage AC signal can be applied between pins 1 and 2 of the connector J4 or J5. 3: The resistors R26 and R27 should not be populated when pins 1 and 2 of J4 are connected to a high

4: The resistors R28 and R29 should not be populated when pins 1 and 2 of J5 are connected to a high

5: The resistors R26, R27, R28 and R29 can be used only when CT outputs are connected to the

JP8 JP5 JP6 JP7

board and prevent electric shock hazard.

voltage.

connectors J4 and J5. In this case, these resistors act as a burden resistor to the CT secondary winding.

ADC I/P

(Vrms)

ADC I/P (Vpeak)

for better resolution

Remark

PIC18F87J72 Evaluation Board User’s Guide

2.1.3 Measurement of Low Voltages

The circuit diagrams in the schematics section of Appendix A. “Schematics and Layouts”, provide details on the resistor values used for the low voltage circuit. Table 2-6

provides a quick reference to resistor values in the low voltage section.

TABLE 2-6: RESISTORS FOR LOW VOLTAGE MEASUREMENT

R34 and R36 1

R33 and R35 1

R37 and R39 1

R38 and R40 1

When measuring a low voltage signal on the input terminals of channels CH0 and CH1, refer to Table 2-7 and Table 2-8. These tables provide the configuration of jumpers, along with the amplitude of the voltage available at the various points. The low voltage signal can be either an AC signal, a DC signal or a signal of any arbitrary wave shape.

TABLE 2-7: JUMPER SETTINGS FOR LOW VOLTAGE MEASUREMENT ON CH0

CH0 Jumper Position ADC

Voltage

(Vrms)

0.1 Short 2-3 Open Open Short 0.05000 0.05000 Internal Gain of 2 can be used for

0.2 Short 2-3 Open Open Short 0.10000 0.10000

0.5 Short 2-3 Open Open Short 0.25000 0.25000

1 Short 2-3 Open Open Short 0.50000 0.50000

1.1 Short 2-3 Open Open Short 0.55000 0.55000 Max Differential ADC I/P is 0.5V

JP1 JP2 JP3 JP4

ADC I/P

(Vrms)

ADC I/P (Vpeak)

better resolution

Remark

TABLE 2-8: JUMPER SETTINGS FOR LOW VOLTAGE MEASUREMENT ON CH1

CH1 Jumper Position ADC

Volta ge

(Vrms)

0.1 Short 2-3 Open Open Short 0.05000 0.05000 Internal Gain of 2 can be used for

0.2 Short 2-3 Open Open Short 0.10000 0.10000

0.5 Short 2-3 Open Open Short 0.25000 0.25000

1 Short 2-3 Open Open Short 0.50000 0.50000

1.1 Short 2-3 Open Open Short 0.55000 0.55000 Max Differential ADC I/P is 0.5V

Note 1: Input low voltage signal can be applied between pins 1 and 2 of the connector J4 or J5.

JP8 JP5 JP6 JP7

ADC I/P

(Vrms)

ADC I/P (Vpeak)

better resolution

Remark

Hardware Description

2.1.4 Measurement of Current Signals

The circuit diagrams in the schematics section of Appendix A. “Schematics and Layouts”, provide details on the resistor values used for the current measurement

circuit. Table 2-9 provides a quick reference to resistor values while measuring the current signals. The output of Current Transformers (CTs) can be connected to the input connector pins.

TABLE 2-9: RESISTORS FOR LOW VOLTAGE MEASUREMENT

R26 and R28 0.063

R27 and R29 0.063

R34 and R36 1

R33 and R35 1

R37 and R39 1

R38 and R40 1

When measuring a current signal on the input terminals of channels CH0 and CH1, refer to Table 2-10 and Table 2-11. These tables provide the configuration of jumpers, along with the amplitude of the voltage available at the various points.

TABLE 2-10: JUMPER SETTINGS FOR CURRENT MEASUREMENT ON CH0

CH0 Jumper Position ADC

CT Primary

Current

(Irms-A)

0.1 Short 2-3 Open Short Open 0.00063 0.00089 Internal Gain of 2 can be used for

0.5 Short 2-3 Open Short Open 0.00315 0.00445

1 Short 2-3 Open Short Open 0.0063 0.00891

10 Short 2-3 Open Short Open 0.063 0.08910

20 Short 2-3 Open Short Open 0.126 0.17819

30 Short 2-3 Open Short Open 0.189 0.26729 Max Differential ADC I/P is 0.5V

JP1 JP2 JP3 JP4

ADC I/P

(Vrms)

ADC I/P (Vpeak)

better resolution

Remark

PIC18F87J72 Evaluation Board User’s Guide

TABLE 2-11: JUMPER SETTINGS FOR CURRENT MEASUREMENT ON CH1

CH1 Jumper Position ADC

CT Primary

Current (Irms-A)

0.1 Short 2-3 Open Short Open 0.00063 0.00089

0.5 Short 2-3 Open Short Open 0.00315 0.00445

1 Short 2-3 Open Short Open 0.0063 0.00891

10 Short 2-3 Open Short Open 0.063 0.08910

20 Short 2-3 Open Short Open 0.126 0.17819

30 Short 2-3 Open Short Open 0.189 0.26729

Note 1: The precautions given need to be strictly adhered to, in order to avoid any damage to the evaluation board

and prevent electric shock hazard.

2: I/P CT Secondary is connected between pins 1 and 3 of J4 and J5. 3: The resistors R26, R27, R28 and R29 need to be populated. These resistors act as burden resistors for

CT secondary.

4: The calculations given in

resistance of 31.5(Ω).

JP1 JP2 JP3 JP4

Ta bl e 2 - 10 and Table 2-11are true for a CT ratio of 1:2500 and a burden

ADC I/P

(Vrms)

ADC I/P (Vpeak)

Internal Gain of 2 can be used for better resolution

Max Differential ADC I/P is 0.5V

Remark

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Microchip Technology PIC18F87J72 User guide

Specifications and Main Features

Frequently Asked Questions

User Manual

Trademarks

Table of Contents

Preface

Chapter 1. Product Overview

1.1 INTRODUCTION

1.2 PIC18F87J72 EVALUATION BOARD FUNCTIONALITY AND FEATURES

1.3 PIC18F87J72 EVALUATION BOARD KIT CONTENTS

Chapter 2. Hardware Description

2.1 INTRODUCTION

2.1.1 PIC18F87J72 Evaluation Board Jumper Settings

2.1.2 Measurement of High Voltages

2.1.3 Measurement of Low Voltages

2.1.4 Measurement of Current Signals