Microchip Technology MCP23X17, Руководство пользователя

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MCP23X17 EVALUATION
BOARD USER’S GUIDE
©
2006 Microchip Technology Inc. DS51592B-page 7
Chapter 2. Installation and Operation
2.1 INTRODUCTION
This chapter discusses the setup and operation of the MCP23X17 Evaluation Board.
The MCP23X17 Evaluation Board is designed to demonstrate simple, low-cost
input/output expansion using the MCP23X17 devices and a low-cost PICmicro
®
microcontroller.
Four MCP23X17 pins are configured as inputs and connected to four momentary push
buttons. The remaining twelve GPIO pins are configured as outputs and connected to
LEDs. Each button causes the LEDs to sequence in a predetermined pattern.
The MCP23X17 is provided in small, space-saving 18-lead SSOP packages.
2.2 FEATURES
The MCP23X17 Evaluation Board has the following features:
• Two 16-bit GPIO Expanders
- MCP23017 with I
2
C interface
- MCP23S17 with SPI interface
• Slide switch for selecting between the two GPIO expanders.
• Four momentary buttons and twelve LEDs, each connected to an individual GPIO
pin to demonstrate the input/output functionality of the MCP23X17.
• Headers for the MCP23X17 pins to allow evaluation in a user defined application.
• Jumpers (not populated, but shorted by a trace on the bottom of the PCB) to
isolate the MCP23X17 from the LEDs and buttons, so they can be evaluated in a
custom circuit.
• Header for programming the PIC16F818.