MCP23x08/mcp23x17 References
AN1081 Title: Interfacing a 4×4 Matrix Keypad with an 8-Bit GPIO Expander -04/12/2007 Mike Curran
https://www.microchip.com/wwwAppNotes/AppNotes.aspx?appnote=en529784
Description:
This application note discusses interfacing a 4×4 matrix keypad with MCP23X08 8-Bit GPIO Expander.
This application note references the MCP23X08/17 GPIO Expander Keypad/LCD Demo Board (GPIODM-KPLCD).
GPIO Expanders provide easy I/O expansion using standard serial interfaces such as I2C and SPI. They are especially useful in applications where pin count is limited on the microcontroller unit (MCU) or if remote inputs / outputs (I/O’s) are needed.
It is best to think of an 8-bit GPIO Expander like adding another 8-bit wide digital port to the MCU. This application note does not detail all of the features of the MCP23X08.
Refer to the MCP23008/MCP23S08 Data Sheet, “8-Bit I/O Expander with Serial Interface” (DS21919) for more information.
MCP23008/MCP23S08 Data Sheet 03/28/2019 625KB
Click to access MCP23008-MCP23S08-Data-Sheet-20001919F.pdf
Errata MCP23008 Rev. A Silicon Errata 11/07/2005 146KB
AN1043 – Unique Features of the MCP23X08/17 GPIO Expanders 06/27/2006 297KB
https://www.microchip.com/wwwAppNotes/AppNotes.aspx?appnote=en027237
AN1081 Title: Interfacing a 4×4 Matrix Keypad with an 8-Bit GPIO Expander -04/12/2007 Mike Curran
AN972 Title: I/O Expansion Using the MCP23X08 and PIC10F202 01/31/2005 Pat Richards
MCP23008/MCP23S08 Evaluation Board User’s Guide
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