Microchip Technology MCP23X17, User Manual

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MCP23X17 Evaluation Board User’s Guide
DS51592B-page 8
©
2006 Microchip Technology Inc.
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: BOARD LAYOUT
MCP23S17 MCP23017
MUX
Selector Switch
Serial and INT
Pins Header
PIC16F818
GPA/GPB Header
LEDs
VDD
GND
Reset
J2
Power
LED
Jumpers
BLINK
ALT
SCROLL
KR
M
Jumpers: Shorted by
default on PCB
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