GPIODM-KPLCD Microchip Technology, GPIODM-KPLCD Datasheet - Page 13

• Manufacturer Part Number: GPIODM-KPLCD
• Description: BOARD DEMO LCD GPIO EXP KEYPAD
• Manufacturer: Microchip Technology

Specifications of GPIODM-KPLCD

• Main Purpose: Interface, Front Panel Controller, LCD
• Embedded: Yes, MCU, 8-Bit
• Utilized Ic / Part: MCP23008, MCP23S08, MCP23017, MCP23S17, PIC18F4550, MCP1702
• Primary Attributes: (2) 8-Bit and (2) 16-Bit GPIO Expanders, 4x4 Keypad, 2x16 LCD
• Secondary Attributes: Headers for the MCP23x08 and MCP23x17
• Silicon Manufacturer: Microchip
• Core Architecture: PIC
• Core Sub-architecture: PIC18
• Features: SPI And I2C Buses, Keypad And LCD Interface, ICSP Header
• Kit Contents: Board
• Silicon Core Number: PIC18F
• Silicon Family Name: PIC18F4xxx
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Not applicable / Not applicable
• For Use With: MCP23S08/17, MCP23008/17
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Not applicable / Not applicable

2.4
© 2006 Microchip Technology Inc.
GPIO EXPANDER KEYPAD AND LCD DEMO BOARD DESCRIPTION
2.4.1
The functional block diagram is shown in
FIGURE 2-2:
1. The GPIO BLOCK contains the MCP23X17 and MCP23X08 GPIO Expanders.
2. The CONTROL BLOCK contains the PIC18F4550 and is the main intelligence
3. The INPUT BLOCK contains the 4x4 keypad matrix. The MCP23X08 devices
4. The OUTPUT BLOCK contains the 2x16 LCD. The MCP23X17 devices control
5. The MCP23X17 and MCP23X08 I/O and serial lines are routed to the HEADER
6. The PROGRAMMING BLOCK contains the ICSP™ header for program-
7. The POWER BLOCK contains the MCP1702 5V voltage regulator. The board
Two (2) MCP23X17 devices are connected to the LCD module and two (2)
MCP23X08 devices are connected to the keypad matrix.
A button on the keypad toggles between I
the MCP23017 and MCP23008 are controlled by the PIC MCU. When in SPI
mode, the MCP23S17 and MCP23S08 are controlled. Only one (1) MCP23X08
and one (1) MCP23X17 is on the bus at a time.
in the system.
are used to scan the keys.
the display.
BLOCK to allow the pins to be probed.
ming/debugging the PIC18F4550.
can be powered by a 9V supply (connected through the power jack) or by
applying 5V directly to the power points.
Major Board Components
Input
Power
FUNCTIONAL BLOCK DIAGRAM
IN
Header
Control
GPIO
Figure
2
C and SPI mode. When in I
2-2.
OUT
Programming
2 X 16 LCD
DS51636A-page 9
Output
2
C mode,