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GPIO Expander Keypad and LCD Demo Board User’s Guide
2.3
GETTING STARTED
The GPIO Expander Keypad and LCD Demo Board is a fully functional, assembled and
tested board for demonstrating the MCP23008 and MCP23017 (I 2 C interface) and
MCP23S08 and MCP23S17 (SPI interface) general purpose I/O expanders. The
following describes the basic setup and operation (see Figure 2-1 ):
1. Either connect a 9V power supply into the power jack (J2) or connect a 5 V power
supply to the V DD and GND test points.
2. The green power LED will illuminate.
3. The LCD will display the startup splash screen.
4. The appropriate LEDs (I 2 C or SPI) will illuminate to indicate the current serial
mode.
5. Pressing buttons:
- 0 - 9, #, *: will be reflected on the LCD
- M: switches modes (I 2 C and SPI) to communicate with the MCP23X17 and
MCP23X08; B: backspace; R: carriage return, and screen clear (2nd
press); S: space
FIGURE 2-1:
BOARD LAYOUT
2 X 16 LCD
16-bit HEADER
Not Populated
USB
USB
LED
LED
PIC18F2550
LED
LED
9V
EXT
+5V
8-bit HEADER
GND
M
7
4
1
*
8
5
2
0
9
6
3
#
M
B
R
S
DS51636A-page 8
? 2006 Microchip Technology Inc.
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