© 2011 Microchip Technology Inc. DS51990A
PIC18F87J72
Evaluation Board
Users Guide
DS51990A-page 2 © 2011 Microchip Technology Inc.
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© 2011, Microchip Technology Incorporated, Printed in the
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ISBN: 978-1-61341-304-3
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Microchip products meet the specification contained in their particular Microchip Data Sheet.
Microchip believes that its family of products is one of the most secure families of its kind on the market today, when used in the
intended manner and under normal conditions.
There are dishonest and possibly illegal methods used to breach the code protection feature. All of these methods, to our
knowledge, require using the Microchip products in a manner outside the operating specifications contained in Microchip’s Data
Sheets. Most likely, the person doing so is engaged in theft of intellectual property.
Microchip is willing to work with the customer who is concerned about the integrity of their code.
Neither Microchip nor any other semiconductor manufacturer can guarantee the security of their code. Code protection does not
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Code protection is constantly evolving. We at Microchip are committed to continuously improving the code protection features of our
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are for its PIC® MCUs and dsPIC® DSCs, KEELOQ® code hopping
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and manufacture of development systems is ISO 9001:2000 certified.
PIC18F87J72 EVALUATION BOARD
USERS GUIDE
© 2011 Microchip Technology Inc. DS51990A-page 3
Table of Contents
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 USERS GUIDE
DS51990A-page 4 © 2011 Microchip Technology Inc.
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
USERS GUIDE
© 2011 Microchip Technology Inc. DS51990A-page 5
Preface
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
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® IDE on-line help.
Select the Help menu, and then Topics to open a list of available on-line help files.
PIC18F87J72 Evaluation Board User’s Guide
DS51990A-page 6 © 2011 Microchip Technology Inc.
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® IDE.
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.
Preface
© 2011 Microchip Technology Inc. DS51990A-page 7
RECOMMENDED READING
This user's guide describes how to use PIC18F87J72 Evaluation Board. Other useful
documents are listed below. The following Microchip documents are available and
recommended as supplemental reference resources.
MPLAB® IDE Simulator, Editor User's Guide (DS51025)
Refer to this document for more information on installation and implementation of the
MPLAB Integrated Development Environment (IDE) software.
THE MICROCHIP WEB SITE
Microchip provides online support through our web site at www.microchip.com.This
web site is used as a means to make files and information easily available to
customers. Accessible by using your favorite Internet browser, the web site contains
the following information:
Product Support – Data sheets and errata, application notes and sample
programs, design resources, user's guides and hardware support documents,
latest software releases and archived software
General Technical Support – Frequently Asked Questions (FAQs), technical
support requests, online discussion groups, Microchip consultant program
member listing
Business of Microchip Product selector and ordering guides, latest Microchip
press releases, listing of seminars and events, listings of Microchip sales offices,
distributors and factory representatives
PIC18F87J72 Evaluation Board User’s Guide
DS51990A-page 8 © 2011 Microchip Technology Inc.
CUSTOMER SUPPORT
Users of Microchip products can receive assistance through several channels:
Distributor or Representative
Local Sales Office
Field Application Engineer (FAE)
Technical Support
Development Systems Information Line
Customers should contact their distributor, representative or field application engineer
(FAE) for support. Local sales offices are also available to help customers. A listing of
sales offices and locations is included in the back of this document.
Technical support is available through the web site at: http://support.microchip.com
DOCUMENT REVISION HISTORY
Revision A (June 2011)
This is the initial release of this document.
PIC18F87J72 EVALUATION BOARD
USERS GUIDE
© 2011 Microchip Technology Inc. DS51990A-page 9
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
DS51990A-page 10 © 2011 Microchip Technology Inc.
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
PIC18F87J72 EVALUATION BOARD
USERS GUIDE
© 2011 Microchip Technology Inc. DS51990A-page 11
Chapter 2. Hard ware Descri ption
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.
FIGURE 2-1: Layout of the PIC18F87J72 Evaluation Board.
4
2
5
3
8
11
10
1
13
6
12 7
9
Legend:
1 PIC18F87J72 microcontroller 8 9V battery connector
2 Seven segment LCD 9 MCP2200 – USB to Universal Asynchronous receiver/transmitter (UART)
serial converter
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
connector 13 10 MHz crystal
7 Touch sensitive keys
PIC18F87J72 Evaluation Board User’s Guide
DS51990A-page 12 © 2011 Microchip Technology Inc.
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 2-1: BOARD LAYOUT AND COMPONENTS
SI
NO Section or Component Functionality
1 PIC18F87J72 microcontroller Main controller for all functions on the board
2 Seven segment LCD To display time and other configuration features like OSR,
Gain, Bit Width
3 High voltage section with connectors For connecting universal input voltage to the board (when not
using 9V supply or battery)
4 RJ11 connector For debugging and programming purpose
5 Load Cell connector Optional provision to connect an external load cell output to the
ADC input channels
6PICtail
connector To connect to other application-specific daughter cards
7 Touch sensitive keys Touch sense switches for changing configuration of
Sigma-Delta ADC
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
board
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
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
© 2011 Microchip Technology Inc. DS51990A-page 13
2.1.2 Measurement of High Voltages
The circuit diagrams in the schematics section of Appendix A. “Schematics and Lay-
outs”, 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 sec-
tion.
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 jump-
ers, 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 Voltsrms
(Vrms) at 50 Hz or 60 Hz.
TABLE 2-3: RESISTORS FOR HIGH VOLTAGE MEASUREMENT
Register Value (K)
R23 and R30 330
R24 and R31 330
R25 and R32 120
R33 and R35 1
R37 and R39 1
TABLE 2-4: JUMPER SETTINGS FOR HIGH VOLTAGE MEASUREMENT ON CH0
CH0 Jumper Position ADC
Remark
Voltage
(Vrms) JP1 JP2 JP3 JP4 ADC I/P
(Vrms)
ADC I/P
(Vpeak)
80 Short 1-2 Open Open Short 0.10230 0.14468 Internal Gain of 2 can be used
for better resolution
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
TABLE 2-5: JUMPER SETTINGS FOR HIGH VOLTAGE MEASUREMENT ON CH1
CH1 Jumper Position ADC
Remark
Voltage
(Vrms) JP8 JP5 JP6 JP7 ADC I/P
(Vrms)
ADC I/P
(Vpeak)
80 Short 1-2 Open Open Short 0.10230 0.14468 Internal Gain of 2 can be used
for better resolution
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
board and prevent electric shock hazard.
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
voltage.
4: The resistors R28 and R29 should not be populated when pins 1 and 2 of J5 are connected to a high
voltage.
5: The resistors R26, R27, R28 and R29 can be used only when CT outputs are connected to the
connectors J4 and J5. In this case, these resistors act as a burden resistor to the CT secondary winding.
PIC18F87J72 Evaluation Board User’s Guide
DS51990A-page 14 © 2011 Microchip Technology Inc.
2.1.3 Measurement of Low Voltages
The circuit diagrams in the schematics section of Appendix A. “Schematics and Lay-
outs”, 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.
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 2-6: RESISTORS FOR LOW VOLTAGE MEASUREMENT
Register Value (K)
R34 and R36 1
R33 and R35 1
R37 and R39 1
R38 and R40 1
TABLE 2-7: JUMPER SETTINGS FOR LOW VOLTAGE MEASUREMENT ON CH0
CH0 Jumper Position ADC
Remark
Voltage
(Vrms) JP1 JP2 JP3 JP4 ADC I/P
(Vrms)
ADC I/P
(Vpeak)
0.1 Short 2-3 Open Open Short 0.05000 0.05000 Internal Gain of 2 can be used for
better resolution
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
TABLE 2-8: JUMPER SETTINGS FOR LOW VOLTAGE MEASUREMENT ON CH1
CH1 Jumper Position ADC
Remark
Voltage
(Vrms) JP8 JP5 JP6 JP7 ADC I/P
(Vrms)
ADC I/P
(Vpeak)
0.1 Short 2-3 Open Open Short 0.05000 0.05000 Internal Gain of 2 can be used for
better resolution
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.
Hardware Description
© 2011 Microchip Technology Inc. DS51990A-page 15
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.
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 2-9: RESISTORS FOR LOW VOLTAGE MEASUREMENT
Register Value (K)
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
TABLE 2-10: JUMPER SETTINGS FOR CURRENT MEASUREMENT ON CH0
CH0 Jumper Position ADC
Remark
CT Primary
Current
(Irms-A)
JP1 JP2 JP3 JP4 ADC I/P
(Vrms)
ADC I/P
(Vpeak)
0.1 Short 2-3 Open Short Open 0.00063 0.00089 Internal Gain of 2 can be used for
better resolution
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
PIC18F87J72 Evaluation Board User’s Guide
DS51990A-page 16 © 2011 Microchip Technology Inc.
TABLE 2-11: JUMPER SETTINGS FOR CURRENT MEASUREMENT ON CH1
CH1 Jumper Position ADC
Remark
CT Primary
Current
(Irms-A)
JP1 JP2 JP3 JP4 ADC I/P
(Vrms)
ADC I/P
(Vpeak)
0.1 Short 2-3 Open Short Open 0.00063 0.00089
Internal Gain of 2 can be used for
better resolution
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
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 Ta b l e 2 - 1 0 and Table 2-11are true for a CT ratio of 1:2500 and a burden
resistance of 31.5().
PIC18F87J72 EVALUATION BOARD
USERS GUIDE
© 2011 Microchip Technology Inc. DS51990A-page 17
Chapter 3. PIC18F87J72 Evaluation Board Features
3.1 INTRODUCTION
This chapter provides a brief description on how to use the PIC18F87J72 Evaluation
Board for the measurement and analysis of various signals. It also describes the
process of the demo and explains various configuration changes for observing the
response using the PIC18F87J72 Evaluation Board.
Figure 3-1 shows the PIC18F87J72 Evaluation Board with the 9V supply connected to
the input jack. The initial set up of the evaluation board involves connecting the supply
to the input jack of the board. This provides the required supply to the evaluation board.
Alternatively, the 9V battery can be connected to power the board. In addition, the USB
cable from the computer is connected to the mini USB connector on the board. This is
used for transmitting and receiving data to and from the board, to and from the GUI tool.
The input signal can be connected to connectors J4 and J5. If the microcontroller is
already programmed, then the program will start executing when the supply is turned
on.
FIGURE 3-1: PIC18F87J72 Evaluation Board and OSR Configuration.
Connect
I/P Signal
(J4 and J5)
9V Supply
Mini USB
Press S1 to
configure OSR
RJ11
connector
Display showing the
configured OSR
PIC18F87J72 Evaluation Board User’s Guide
DS51990A-page 18 © 2011 Microchip Technology Inc.
If the evaluation board is used in programmer mode, then the waveforms and the
response can be observed on the GUI. If the evaluation board is used in debugging
mode, using the MPLAB IDE, then the user can see the response on the Data Monitor
and Control Interface (DMCI) window.
For debugging, the Real ICE/ICD debugger and programmer is connected to the RJ11
connector. After the software is compiled and programmed to the PIC18F87J72 device,
the program can be executed. The LCD display on the board will indicate the time and
the waveforms that can be observed on the GUI window or DMCI. The LCD display on
the board will indicate the time. The various waveforms applied at the input can be
observed on the GUI or DMCI.
Various changes to the device configuration can be done using the touch sensitive keys
S1, S2, S3 and S4. The on-chip CTMU peripheral is used for all the touch-sensitive
keys.
Press the key S1, to change the Over Sampling Ratio (OSR) as shown in Figure 3-1.
There are four OSR configurations that can be created using S1. Each press of the key
S1 will change the configuration of the sigma delta ADC with OSR values from a value
of 256, 128, 64 and 32.
The time from the RTCC can also be displayed using the key S1 as shown in
Figure 3-2.
The RTCC date and time can be set using the following steps:
Press the keys S2 and S4 simultaneously to enter into the RTCC date setting
mode. The date field on the LCD will start blinking.
The date can be changed by pressing the key S4 for incrementing and S2 for
decrementing. The key S1 can be used to set the day, month and year fields.
Press the keys S1 and S2 simultaneously, to enter into the RTCC time setting
mode. The time field on the LCD will start blinking.
The time can be changed by pressing the key S4 for incrementing and S2 for
decrementing. The key S1 can be used to set the hour, minute and second fields.
By pressing the key S1 repeatedly, the OSR configurations will sequentially change
from 256 to 32 and then back to 256.
FIGURE 3-2: Displaying Time and Date
Press S1 to
view time
Display showing Time
PIC18F87J72 Evaluation Board Features
© 2011 Microchip Technology Inc. DS51990A-page 19
As shown in Figure 3-3, the S2 key is used for changing the internal PGA gain of the
first channel. The gains can be changed from 1 to 32 with each press of the key. When
pressing the S2 key repeatedly, the gain configurations of the Sigma Delta ADC will
sequentially change from 1, 2, 4, 8, 16, 32 and then back to 1.
FIGURE 3-3: Configuring Internal PGA Gain for voltage channel.
Display showing channel gain
Press S2 to
configure
voltage gain
PIC18F87J72 Evaluation Board User’s Guide
DS51990A-page 20 © 2011 Microchip Technology Inc.
Figure 3-4 shows the function of the S3 key, which is used to change the internal gain
of the second input channel. The gains can be changed from 1 to 32 with each press
of the key. When pressing the S3 key repeatedly, the gain configurations of the Sigma
Delta ADC will sequentially change from 1, 2, 4, 8, 16, 32 and then back to 1.
FIGURE 3-4: Configuring Internal PGA Gain for Current Channel.
Press S3 to
configure
current gain
Display showing channel gain
PIC18F87J72 Evaluation Board Features
© 2011 Microchip Technology Inc. DS51990A-page 21
Figure 3-5 shows the function of the S4 key, which is used to change the bit width of
the ADC conversion. Two configurations of the ADC bits are possible, either 16-bit or
24-bit. When the S4 key is pressed repeatedly, the bits toggle between 16 and 24-bit
width.
FIGURE 3-5: Configuring the Number of Bits.
Press S4 to configure
current gain
Display showing
ADC bit width
PIC18F87J72 Evaluation Board User’s Guide
DS51990A-page 22 © 2011 Microchip Technology Inc.
NOTES:
PIC18F87J72 EVALUATION BOARD
USERS GUIDE
© 2011 Microchip Technology Inc. DS51990A-page 23
Chapter 4. PIC18F87J72 Evaluation Board Firmware Flowchart
4.1 INTRODUCTION
This chapter provides the flowcharts describing the functions and routines
implemented in the PIC18F87J72 Evaluation Board firmware.
Figures 4-1 4-6 show the flow of the following routines:
Main routine (see Figure 4-1)
Touch Key press routines (see Figure 4-2)
Time display routines (see Figure 4-2)
OSR switching routines (see Figure 4-2)
Channel CH0 Gain switching routines (see Figure 4-3)
Channel CH1 Gain switching routines (see Figure 4-4)
Bit width changing routines (see Figure 4-5)
UART Transmit Interrupt routine (see Figure 4-6)
UART Receive Interrupt routine (see Figure 4-6)
INT0 Interrupt routine (see Figure 4-6)
PIC18F87J72 Evaluation Board User’s Guide
DS51990A-page 24 © 2011 Microchip Technology Inc.
FIGURE 4-1: Main Routine
Initialize
Peripherals
SPI, UART
SW1
Press?
SW2
Press?
SW4
Press?
SW3
Press?
START
OSR
or
Read Time
Switch
CH0 Gain
Switch
Bits
Switch
CH1 Gain
Switch
Configure ADC,
RTCC, CTMU
Measure
Capacitor
Voltage
Charge CTMU
Pads of 4
Switches
16
SUM and
Average Voltage
Discharge CTMU
Pads of 4
Switches
Check for change
in Capacitance
Calibrate for Pad
Sensitivity (if
required)
Idle
YES YES YES YES
NO NO NO NO
Idle
1 2 3 4
High Priority
Interrupt
Service
Routine
Interrupt
Request?
5
YES
NO
PIC18F87J72 Evaluation Board Firmware Flowchart
© 2011 Microchip Technology Inc. DS51990A-page 25
FIGURE 4-2: Key Press Routine to Configure OSR and Display Time.
osr_value = 0 osr_value = 1 osr_value = 2 osr_value = 3
Set OSR
256, Write
Display
OSR = 256 on
LCD
Set OSR
128, Write
Display
OSR = 128 on
LCD
Set OSR
32, Write
Display
OSR = 32 on
LCD
Set OSR
64, Write
Display
OSR = 64 on
LCD
osr_value = 4
Read
RTCC
Display TIME
HR:MIN:SEC
Disable Global
Interrupts
Enable Global
Interrupts
Disable Global
Interrupts
Disable Global
Interrupts
Disable Global
Interrupts
Disable Global
Interrupts
Enable Global
Interrupts
Enable Global
Interrupts
Enable Global
Interrupts
Enable Global
Interrupts
YES YES YES YES YES
NONONO
NO
Idle
1
PIC18F87J72 Evaluation Board User’s Guide
DS51990A-page 26 © 2011 Microchip Technology Inc.
FIGURE 4-3: Key Pres s Routine to Configur e Ga in of Channel CH0.
gain1_value
= 0
gain1_value
= 1
gain1_value
= 2
gain1_value
= 3
CH0
Gain=1,
Write
Display
GAIN = 1 on
LCD
CH0
Gain=2,
Write
Display
GAIN = 2 on
LCD
CH0
Gain=8,
Write
Display
GAIN = 8 on
LCD
CH0
Gain=4,
Write
Display
GAIN = 4 on
LCD
gain1_value
= 4
CH0
Gain=16,
Write
Display
GAIN = 16 on
LCD
Disable Global
Interrupts
Enable Global
Interrupts
Disable Global
Interrupts
Disable Global
Interrupts
Disable Global
Interrupts
Disable Global
Interrupts
Enable Global
Interrupts
Enable Global
Interrupts
Enable Global
Interrupts
Enable Global
Interrupts
YES YES YES YES YES
NONONO
NO
Idle
gain1_value
= 5
CH0
Gain=32,
Write
Display
GAIN = 32 on
LCD
Disable Global
Interrupts
Enable Global
Interrupts
YES
NO
2
PIC18F87J72 Evaluation Board Firmware Flowchart
© 2011 Microchip Technology Inc. DS51990A-page 27
FIGURE 4-4: Key Pres s Routine to Configur e Ga in of Chann el CH1.
gain2_value
= 0
gain2_value
= 1
gain2_value
= 2
gain2_value
= 3
CH1
Gain=1,
Write
Display
GAIN = 1 on
LCD
CH1
Gain=2,
Write
Display
GAIN = 2 on
LCD
CH1
Gain=8,
Write
Display
GAIN = 8 on
LCD
CH1
Gain=4,
Write
Display
GAIN = 4 on
LCD
gain2_value
= 4
CH1
Gain=16,
Write
Display
GAIN = 16 on
LCD
Disable Global
Interrupts
Enable Global
Interrupts
Disable Global
Interrupts
Disable Global
Interrupts
Disable Global
Interrupts
Disable Global
Interrupts
Enable Global
Interrupts
Enable Global
Interrupts
Enable Global
Interrupts
Enable Global
Interrupts
YES YES YES YES YES
NONONO
NO
Idle
gain2_value
= 5
CH1
Gain=32,
Write
Display
GAIN = 32 on
LCD
Disable Global
Interrupts
Enable Global
Interrupts
YES
NO
3
PIC18F87J72 Evaluation Board User’s Guide
DS51990A-page 28 © 2011 Microchip Technology Inc.
FIGURE 4-5: Key Press Routine to Configure Bit Width of Channel CH0 and CH1.
Idle
bit_width = 0 bit_width = 1
Set Bits
16, Write
Display
BITS = 16 on
LCD
Set bits
24, Write
Display
BITS = 24 on
LCD
Disable Global
Interrupts
Enable Global
Interrupts
Disable Global
Interrupts
Enable Global
Interrupts
YES YES
NO
4
PIC18F87J72 Evaluation Board Firmware Flowchart
© 2011 Microchip Technology Inc. DS51990A-page 29
FIGURE 4-6: Interrupt Service Routine for UART and INT0 Interrupts.
5
UART
TX Interrupt
Flag = 1?
UART
RX Interrupt
Flag = 1?
INT0
Interrupt
Flag = 1?
Measure
CH0, CH1
Signals
through SPI
Store Data in
RAM for DMCI
or UART
Disable INT0
Interrupt
Enable UART RX
Interrupt
Return From
Interrupt
Disable UART TX
Interrupt
Enable INT0
Interrupt
Return From
Interrupt
Disable UART RX
Interrupt
Enable UART TX
Interrupt
Return From
Interrupt
Receive
Data from
RCREG1
Transmit
Data from
TXREG1
Process and Write
Data to TXREG1
PIC18F87J72 Evaluation Board User’s Guide
DS51990A-page 30 © 2011 Microchip Technology Inc.
NOTES:
PIC18F87J72 EVALUATION BOARD
USERS GUIDE
© 2011 Microchip Technology Inc. DS51990A-page 31
Chapter 5. PI C18F87J72 Evaluation Board Lab Test Results
5.1 INTRODUCTION
This chapter provides the various laboratory test results obtained when using the
PIC18F87J72 Evaluation Board. This chapter also describes the use of the Data
Monitor and Control Interface (DMCI) window to plot the waveforms present on
Channel CH0 and CH1 of the evaluation board. Displaying waveforms on the DMCI
window can only be done when the user is working in Debugging mode. In Debugging
mode, the MPLAB IDE needs to be uploaded and the debugger connected to the RJ11
connector of the PIC18F87J72 Evaluation Board.
Figure 5-1 shows two graphs (i.e., Graph 1 and Graph 2). Graph 1 shows the waveform
created on Channel CH0 of the PIC18F87J72 Evaluation Board. Graph 2 shows the
waveform created on Channel CH1 of the PIC18F87J72 Evaluation Board. CH0 and
CH1 are both connected to the same signal of 300 mV. The internal PGA gain is chosen
to be 8 for CH0 and 1 for Channel CH1.
FIGURE 5-1: DMCI Waveforms for 300mV Waveform with CH0 Gain = 8, CH1 Gain = 1.
PIC18F87J72 Evaluation Board User’s Guide
DS51990A-page 32 © 2011 Microchip Technology Inc.
Figure 5-2 shows Graph 1 for CH0 and Graph 2 for CH1. The OSR for both CH0 and
CH1 are chosen to be 32 and the signal amplitude applied at the input is a very low
voltage sine wave signal of about 20 mV peak. The user can clearly observe the
distortion of the waveform with such a low OSR value.
FIGURE 5-2: DMCI Waveforms for 20mV Waveform with OSR = 32 on CH0 and CH1.
PIC18F87J72 Evaluation Board Lab Test Results
© 2011 Microchip Technology Inc. DS51990A-page 33
Figure 5-3 shows Graph 1 for CH0 and Graph 2 for CH1. The OSR for both CH0 and
CH1 are chosen to be 256 and the same signal is applied at the input with a very low
voltage sine wave signal of about 20 mV peak. Here, the sine wave shape is still
retained and the signal distortion is less when compared to Figure 5-2.
FIGURE 5-3: DMCI Waveforms for 20mV Waveform with OSR = 256 on CH0 and CH1.
PIC18F87J72 Evaluation Board User’s Guide
DS51990A-page 34 © 2011 Microchip Technology Inc.
Figure 5-4 shows Graph 1 for CH0 and Graph 2 for CH1. CH0 and CH1 are both
connected to the same signal of 300 mV. The internal PGA gain is chosen to be 1 for
CH0 and 32 for Channel CH1. The waveform on Graph 1 is intact, while the waveform
on Graph 2 is saturated at a value of 32768. This demonstrates the effect of saturation
when larger gains are used. This would distort the wave to a flat top waveform, and the
information related to the shape of the signal would be lost.
FIGURE 5-4: DMCI Waveforms for 300mV Waveform with CH0 Gain = 1, CH1 Gain = 32.
PIC18F87J72 EVALUATION BOARD
USERS GUIDE
© 2011 Microchip Technology Inc. DS51990A-page 35
Chapter 6. PIC18F87J72 Evaluation Board GUI
6.1 INTRODUCTION
This chapter describes the Graphical User Interface used for the PIC18F87J72
Evaluation Board. Figure 6-1 indicates the various waveforms and the parameters that
can be displayed on the GUI. The signals can be viewed in their real-time state in Time
domain as well as in Frequency domain. UART is used for communication between the
GUI and the microcontroller. The baud rate used for communication is 38400. To use
the GUI, the following run-time engines must be installed:
Visa441runtime
LVRTE86std
FIGURE 6-1: PIC18F87J72 Evaluation Board Graphical User Interface.
Length
PIC18F87J72 Evaluation Board User’s Guide
DS51990A-page 36 © 2011 Microchip Technology Inc.
NOTES:
PIC18F87J72 EVALUATION BOARD
USERS GUIDE
© 2011 Microchip Technology Inc. DS51990A-page 37
Appendix A. Schematics and Layouts
A.1 INTRODUCTION
This appendix contains the following schematics and layouts of the PIC18F87J72
Evaluation Board:
Board – Schematic 1
Board – Schematic 2
Board – Schematic 3
Board – Schematic 4
Board – PCB Front Page
Board – PCB Top Silk
Board – PCB Top Layer
Board – PCB Bottom Layer
Board – PCB Bottom Silk
Board – PCB L1 Ground
Board – PCB L2 VDD
PIC18F87J72 Evaluation Board User’s Guide
DS51990A-page 38 © 2011 Microchip Technology Inc.
A.2 BOARD – SCHEMATIC 1
Schematics and Layouts
© 2011 Microchip Technology Inc. DS51990A-page 39
A.3 BOARD – SCHEMATIC 2
RG1* is Unused Pin
PIC18F87J72 Evaluation Board User’s Guide
DS51990A-page 40 © 2011 Microchip Technology Inc.
A.4 BOARD – SCHEMATIC 3
Schematics and Layouts
© 2011 Microchip Technology Inc. DS51990A-page 41
A.5 BOARD – SCHEMATIC 4
PIC18F87J72 Evaluation Board User’s Guide
DS51990A-page 42 © 2011 Microchip Technology Inc.
A.6 BOARD – PCB FRONT PAGE
PICTail
TM
Schematics and Layouts
© 2011 Microchip Technology Inc. DS51990A-page 43
A.7 BOARD – PCB TOP SILK
PICTail
TM
PIC18F87J72 Evaluation Board User’s Guide
DS51990A-page 44 © 2011 Microchip Technology Inc.
A.8 BOARD – PCB TOP LAYER
Schematics and Layouts
© 2011 Microchip Technology Inc. DS51990A-page 45
A.9 BOARD – PCB BOTTOM LAYER
PIC18F87J72 Evaluation Board User’s Guide
DS51990A-page 46 © 2011 Microchip Technology Inc.
A.10 BOARD – PCB BOTTOM SILK
Schematics and Layouts
© 2011 Microchip Technology Inc. DS51990A-page 47
A.11 BOARD – PCB L1 GROUND
PIC18F87J72 Evaluation Board User’s Guide
DS51990A-page 48 © 2011 Microchip Technology Inc.
A.12 BOARD – PCB L2 VDD
PIC18F87J72 EVALUATION BOARD
USERS GUIDE
© 2011 Microchip Technology Inc. DS51990A-page 49
Appendix B. Bill of Materials (BOM)
This chapter provides the Bill of Materials for all the components and devices used on
the PIC18F87J72 Evaluation Board.
TABLE B-1: BILL OF MATERIALS (BOM)
Qty Reference Description Manufacturer Part Number
1 BAT1 BATTERY IND ALKALINE 9 VOLT Energizer EN22
1 BAT1 CONN PC VERT 9V SNAP-ON Keystone 96B
4 C1, C3, C5,
C7
CAP 47UF 16V ELECT FP SMD Panasonic® ECG EEE-FPC470UAR
16 C2, C4, C6,
C8, C14,
C15, C16,
C17, C18,
C19, C20,
C21, C27,
C28, C32,
C33
CAP CER .1UF 25V Y5V 0603 Murata
Electronics®
GRM188F51E104ZAA01D
5 C9, C10,
C11, C12,
C26
CAP CER 47000PF 50V X7R 10% 0603 TDK Corporation C1608X7R1H473K
2 C13, C31 CAP 10UF 16V ELECT FP SMD Panasonic ECG EEE-FP1C100AR
4 C22, C23,
C29, C30
CAP CER 18PF 50V C0G 5% 0603 TDK Corporation C1608C0G1H180J
2 C24, C25 CAP CER 12PF 50V C0G 5% 0603 TDK Corporation C1608C0G1H120J
5 C34, C35,
C36, C37,
C38
CAP CER 10000PF 50V 10% X7R 0805 Murata Electronics GRM216R71H103KA01D
4 D1, D3,
D16, D17
DIODE SCHOTTKY 20V 500MA SOD123 Micro Commercial
Components
MBR0520-TP
2 D2, D4 LED GREEN CLEAR 0805 SMD Lite-On Semi. LTST-C170GKT
2 D5, D6 LED YELLOW CLEAR 0805 SMD Lite-On Semi. LTST-C170YKT
9 D7, D8, D9,
D10, D11,
D12, D13,
D14, D15
DIODE SWITCH 215MA 70V SOT-23 Comchip Tech. BAV99-G
1 D18 DIODE 75V 150MA SOD323F Fairchild Semi. 1N4148WS
1 J1 CONN POWERKJACK MINI R/A T/H Switchcraft RAPC722X
1 J2 CONN 6-6 MOD JACK Stewart Connector SS-7066-NF
1 J3 CONN USB RCPT MINI B 5PS R/A SMD JAE Electronics DX2R005HN2E700
2 J4, J5 TERMINAL BLOCK 5MM 3POS PCB On-Shore Tech. ED3101/3-WD
1 J6 TERMINAL BLOCK 5MM 2POS PCB On-Shore Tech. ED3101/2-WD
1 J7 CONN RECEPT 28POS .100 VERT DUAL TE Connectivity 1-234998-4
1 J8 CONN RECEPT 12POS .100 VERT DUAL 3M 960230-6202-AR
1 J9 CONN HEADER 6POS .100” STR TIN Molex 90120-0126
Bill of Materials (BOM)
© 2011 Microchip Technology Inc. DS51990A-page 50
2 JP1, JP8 CONN HEADER 3POS .100” STR TIN Molex 90120-0123
6JP2, JP3,
JP4, JP5,
JP6, JP7
CONN HEADER 2POS .100 VERT TIN Molex/Waldom
Electronics Corp.
22-03-2021
2 L1, L2 FERRITE CHIP 120 OHM 2000MA 0603 Murata Electronics BLM18PG121SN1D
1 LCD1 Energy Meter LCD Display Deepkashi Display
Devices
DP-093
1 PCB RoHS Compliant Bare PCB, PIC18F87J72
Evaluation Board
104-00333
1 Q1 IC REG LDO 800MA 5.0V SOT-223 National Semi. LM1117MPX-5.0/NOPB
1 Q2 IC REG LDO 800MA 3.3V SOT-223 National Semi. LM1117MPX-3.3/NOPB
11 R1, R2, R5,
R11, R12,
R15, R16,
R17, R18,
R19, R21
RES 1K OHM 1/10W 5% 0603 SMD Stackpole Elec. RMCF 1/16 1K 5% R
1 R3 RES 0.0 OHM 1/10W 0603 SMD Stackpole Elec. RMCF 1/16 0 R
7 R4, R7, R8,
R47, R48,
R49, R50
RES 100 OHM 1/10W 5% 0603 SMD Stackpole Elec. RMCF 1/16 100 5% R
1 R6 RES 10K OHM 1/10W 5% 0603 SMD Stackpole Elec. RMCF 1/16 10K 5% R
1 R9 RES 1.0 OHM 1/4W 5% 1206 SMD ROHM Semi. MCR18EZPJ1R0
2 R13, R14 RES 47.0 OHM 1/4W 1% 1206 SMD ROHM Semi. MCR18EZPF47R0
2 R20, R22 RES 470 OHM 1/10W 5% 0603 SMD Stackpole Elec. RMCF 1/16 470 5% R
4 R23, R24,
R30, R31
RES 330K OHM 1/2W 5% 2010 SMD ROHM Semi. MCR50JZHJ334
2 R25, R32 RES 120K OHM 1/2W 5% 2010 SMD ROHM Semi. MCR50JZHJ124
4 R26, R27,
R28, R29
RES 47 OHM 1/8W .1% 0805 SMD Panasonic ECG ERA-6AEB470V
10 R33, R34,
R35, R36,
R37, R38,
R39, R40,
R41, R42
RES 1.0K OHM 1/8W .1% 0805 SMD SUSUMU Co. RG2012P-102-B-T
4R43, R44,
R45, R46
RESISTOR 1.0 OHM 1/10W 5% 0603 Panasonic ECG ERJ-3GEYJ1R0V
1 U1 80-Pin, High-Performance Microcontrollers with
Dual-Channel AFE, LCD Driver and nanoWatt
Technology TQFP-80
Microchip Tech. Inc. PIC18F87J72-I/PT
1 U2 512K I2C Serial EEPROM SOIC-8 Microchip Tech. Inc. 24LC512-I/SM
2 U3, U6 OPTOCOUPLER LOGIC OUT VDE 6-SMD Fairchild Semi. H11L1SR2VM
1 U4 USB 2.0 to UART protocol Converter with GPIO
SSOP-20
Microchip
Te c hn o l o g y I n c .
MCP2200-I/SO
1 U5 IC ESD PROTECTION LO CAP SOT23-6 STMicroelectronics USBLC6-2SC6
1 X1 CRYSTAL 10.000MHZ 18PF SMD ECS Ltd. ECS-100-18-5PX-TR
1 X2 CRYSTAL 32.768 KHZ 12.5PF CYL ECS Ltd. ECS-327-12.5-13X
1 X3 CRYSTAL 12.000MHZ 18PF SMD ECS Ltd. ECS-120-18-5PX-TR
TABLE B-1: BILL OF MATERIALS (BOM) (CONTINUED)
Qty Reference Description Manufacturer Part Number
© 2011 Microchip Technology Inc. DS51990A-page 51
NOTES:
DS51990A-page 52 © 2011 Microchip Technology Inc.
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