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PIC18F87J72 Evaluation Board User’s Guide
TABLE 2-1:
BOARD LAYOUT AND COMPONENTS
SI
NO
1
2
3
4
5
6
7
8
9
10
11
12
13
Section or Component
PIC18F87J72 microcontroller
Seven segment LCD
High voltage section with connectors
RJ11 connector
Load Cell connector
PICtail ? connector
Touch sensitive keys
9V battery connector
MCP2200 – USB to UART serial converter
Mini B USB receptacle
9V power supply jack
32.768 kHz crystal
10 MHz crystal
Functionality
Main controller for all functions on the board
To display time and other configuration features like OSR,
Gain, Bit Width
For connecting universal input voltage to the board (when not
using 9V supply or battery)
For debugging and programming purpose
Optional provision to connect an external load cell output to the
ADC input channels
To connect to other application-specific daughter cards
Touch sense switches for changing configuration of
Sigma-Delta ADC
To connect a 9V battery when powering the board through it
To communicate with the GUI
To connect the USB port of the computer to the evaluation
board
9V power supply to the board
Clock to the internal Real-Time Clock and Calendar (RTCC)
External Clock to the main controller
2.1.1
PIC18F87J72 Evaluation Board Jumper Settings
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
DS51990A-page 12
SI NO
1
2
3
4
5
6
7
8
Device
JP1
JP2
JP3
JP4
JP5
JP6
JP7
JP8
Description
Selection between high voltage and low voltage input on channel CH0
To ground Pin 1 of J4
Used for burden connections when CT output is connected to J4
To ground Pin 3 of J4
To ground Pin 1 of J5
Used for burden connections when CT output is connected to J5
To ground Pin 3 of J5
Selection between high voltage and low voltage input on channel CH1
? 2011 Microchip Technology Inc.
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