i/o port expansion in microcontrollers

[fuuton]

hi people
can anyone tell me how to expand the i/o port...
i mean i hav a small number of pins left and i hav to use more...

 

[Awarapunshee]

One option is to use Microchip MCP23017 16-Bit I/O Expander with Serial Interface.
See its data sheet details.

Regards

 

[IanP]

There is a range of I2C-bus port expanders ..
Eg:
PCF8575C: Remote 16-Bit I2C and SMBus I/O Expander with Interrupt Output
PCF8574: Remote 8-Bit I/O Expander for I2C-Bus
https://focus.ti.com/docs/prod/folders/print/pcf8575.html

Google for more ..

IanP

 

[red_beans]

cat9555 16IO IIC