Microchip Technology MCP23X17EV Manual Do Utilizador

DS51592B-page 8

© 2006 Microchip Technology Inc.

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.

MUX

Selector Switch

Serial and INT

Pins Header

GPA/GPB Header

LEDs

VDD

GND

Reset

J2

Power

LED

Jumpers

BLINK

ALT

SCROLL

KR

M

Jumpers: Shorted by 

default on PCB 

bottom