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MCP23X17 Evaluation Board User’s Guide
2.3
GETTING STARTED
The MCP23X17 Evaluation Board is a fully functional, assembled and tested board for
evaluation of the MCP23017 (I 2 C interface) 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 5V power
supply to the V DD and GND test points.
2. The green power LED will illuminate.
3. The device selector slide switch selects between the two devices. Slide the
switch towards the device of choice.
4. On power-up, the LEDs will sequence in a slow scroll pattern.
5. Press a button and the LED sequencing will match the function defined by the
button. For example, pressing the “Blink” button will cause the LEDs to
continuously blink.
FIGURE 2-1:
MCP23017
BOARD LAYOUT
LEDs
GPA/GPB Header
MCP23S17
Jumpers: Shorted by
default on PCB
bottom
MUX
Serial and INT
Pins Header
Power
LED
Selector Switch
J2
VDD
GND
Reset
PIC16F818
DS51592B-page 8
BLINK
Jumpers
ALT
SCROLL
KR
M
? 2006 Microchip Technology Inc.
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