Note the following details of the code protection feature on Microchip devices:
•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
mean that we are guaranteeing the product as “unbreakable.”
Code protection is constantly evolving. We at Microchip are committed to continuously improving the code protection features of our
products. Attempts to break Microchip’s code protection feature may be a violation of the Digital Millennium Copyright Act. If such acts
allow unauthorized access to your software or other copyrighted work, you may have a right to sue for relief under that Act.
Information contained in this publication regarding device
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and may be superseded by updates. It is your responsibility to
ensure that your application meets with your specifications.
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®
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:
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
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
Refer to this document for more information on installation and implementation of the
MPLAB Integrated Development Environment (IDE) software.
®
IDE Simulator, Editor User's Guide (DS51025)
THE MICROCHIP WEB SITE
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Technical support is available through the web site at: http://support.microchip.com
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
1.2PIC18F87J72 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.
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
11
10
3
5
2
4
1
13
8
6
7
Legend:
9
1PIC18F87J72 microcontroller89V battery connector
2Seven segment LCD9MCP2200 – USB to Universal Asynchronous receiver/transmitter (UART)
3High voltage section with connectors10 Mini B USB receptacle
4RJ11 connector11 9V power supply jack
5Load Cell connector12 32.768 kHz crystal
6PICtail
7Touch sensitive keys
™
connector13 10 MHz crystal
serial converter
12
FIGURE 2-1:Layout of the PIC18F87J72 Evaluation Board.
1PIC18F87J72 microcontrollerMain controller for all functions on the board
2Seven segment LCDTo display time and other configuration features like OSR,
3High voltage section with connectorsFor connecting universal input voltage to the board (when not
4RJ11 connectorFor debugging and programming purpose
5Load Cell connectorOptional provision to connect an external load cell output to the
6PICtail™ connectorTo connect to other application-specific daughter cards
7Touch sensitive keysTouch sense switches for changing configuration of
89V battery connectorTo connect a 9V battery when powering the board through it
9MCP2200 – USB to UART serial converterTo communicate with the GUI
10Mini B USB receptacleTo connect the USB port of the computer to the evaluation
119V power supply jack9V power supply to the board
1232.768 kHz crystalClock to the internal Real-Time Clock and Calendar (RTCC)
1310 MHz crystalExternal Clock to the main controller
Section or ComponentFunctionality
Gain, Bit Width
using 9V supply or battery)
ADC input channels
Sigma-Delta ADC
board
2.1.1PIC18F87J72 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 NODeviceDescription
1JP1Selection between high voltage and low voltage input on channel CH0
2JP2To ground Pin 1 of J4
3JP3Used for burden connections when CT output is connected to J4
4JP4To ground Pin 3 of J4
5JP5To ground Pin 1 of J5
6JP6Used for burden connections when CT output is connected to J5
7JP7To ground Pin 3 of J5
8JP8Selection between high voltage and low voltage input on channel CH1
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
RegisterValue (KΩ)
R23 and R30 330
R24 and R31330
R25 and R32120
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 from85-265 Volts
(Vrms) at 50 Hz or 60 Hz.
rms
TABLE 2-4:JUMPER SETTINGS FOR HIGH VOLTAGE MEASUREMENT ON CH0
CH0 Jumper PositionADC
Voltage
(Vrms)
80Short 1-2OpenOpenShort0.102300.14468Internal Gain of 2 can be used
110Short 1-2OpenOpenShort0.140660.19893
220Short 1-2OpenOpenShort0.281330.39786
270Short 1-2OpenOpenShort0.345270.48828
280Short 1-2OpenOpenShort0.358060.50637Max Differential ADC I/P is 0.5V
JP1JP2JP3JP4
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 PositionADC
Volta ge
(Vrms)
80Short 1-2OpenOpenShort0.102300.14468Internal Gain of 2 can be used
110Short 1-2OpenOpenShort0.140660.19893
220Short 1-2OpenOpenShort0.281330.39786
270Short 1-2OpenOpenShort0.345270.48828
280Short 1-2OpenOpenShort0.358060.50637Max 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
JP8JP5JP6JP7
board and prevent electric shock hazard.
voltage.
voltage.
connectors J4 and J5. In this case, these resistors act as a burden resistor to the CT secondary winding.
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
RegisterValue (KΩ)
R34 and R36 1
R33 and R35 1
R37 and R391
R38 and R401
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 PositionADC
Voltage
(Vrms)
0.1Short 2-3OpenOpenShort0.050000.05000Internal Gain of 2 can be used for
0.2Short 2-3OpenOpenShort0.100000.10000
0.5Short 2-3OpenOpenShort0.250000.25000
1Short 2-3OpenOpenShort0.500000.50000
1.1Short 2-3OpenOpenShort0.550000.55000Max Differential ADC I/P is 0.5V
JP1JP2JP3JP4
ADC I/P
(Vrms)
ADC I/P
(Vpeak)
better resolution
Remark
TABLE 2-8:JUMPER SETTINGS FOR LOW VOLTAGE MEASUREMENT ON CH1
CH1 Jumper PositionADC
Volta ge
(Vrms)
0.1Short 2-3 OpenOpenShort0.050000.05000Internal Gain of 2 can be used for
0.2Short 2-3 OpenOpenShort0.100000.10000
0.5Short 2-3 OpenOpenShort0.250000.25000
1Short 2-3OpenOpenShort0.500000.50000
1.1Short 2-3 OpenOpenShort0.550000.55000Max 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.
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
RegisterValue (KΩ)
R26 and R28 0.063
R27 and R290.063
R34 and R361
R33 and R351
R37 and R391
R38 and R401
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 PositionADC
CT Primary
Current
(Irms-A)
0.1Short 2-3OpenShortOpen0.000630.00089Internal Gain of 2 can be used for
0.5Short 2-3OpenShortOpen0.003150.00445
1Short 2-3OpenShortOpen0.00630.00891
10Short 2-3OpenShortOpen0.0630.08910
20Short 2-3OpenShortOpen0.1260.17819
30Short 2-3OpenShortOpen0.1890.26729Max Differential ADC I/P is 0.5V
TABLE 2-11:JUMPER SETTINGS FOR CURRENT MEASUREMENT ON CH1
CH1 Jumper PositionADC
CT Primary
Current
(Irms-A)
0.1Short 2-3OpenShortOpen0.000630.00089
0.5Short 2-3OpenShortOpen0.003150.00445
1Short 2-3OpenShortOpen0.00630.00891
10Short 2-3OpenShortOpen0.0630.08910
20Short 2-3OpenShortOpen0.1260.17819
30Short 2-3OpenShortOpen0.1890.26729
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).
JP1JP2JP3JP4
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
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.
PIC18F87J72 EVALUATION BOARD
USER’S GUIDE
Display showing the
configured OSR
Connect
I/P Signal
(J4 and J5)
9V Supply
Mini USB
RJ11
connector
Press S1 to
configure OSR
FIGURE 3-1:PIC18F87J72 Evaluation Board and OSR Configuration.
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.
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.
Display showing channel gain
FIGURE 3-3:Configuring Internal PGA Gain for voltage channel.
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.
Display showing channel gain
FIGURE 3-4:Configuring Internal PGA Gain for Current Channel.
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.
Chapter 5. PIC18F87J72 Evaluation Board Lab Test Results
5.1INTRODUCTION
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.
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.
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.
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.
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
PIC18F87J72 EVALUATION BOARD
USER’S GUIDE
Length
FIGURE 6-1:PIC18F87J72 Evaluation Board Graphical User Interface.