Front Panel For 8 Bit Computers

From Land Boards Wiki
Jump to navigation Jump to search

Tindie-mediums.png

Front Panel for 8-Bit Microprocessors

EightBitFrontPanel720px.JPG

Features

It has these features. They may not fit your generic design. Especially since this card has to have an I2C interface.

  • I2C interface (Two Wire interface - plus power and ground)
  • Occupy I2C addresses either 0x20-0x23 or 0x24-0x27
  • Jumper selectable base address
  • Jumper Selectable I2C terminators
  • I2C daisy-chain connector
  • Interrupt line
    • Can be configured to interrupt on button presses
    • MCP23017 need to be set to Open-Drain output - card has pull-up to Vcc
  • 4 MCP23017 16-bit I2C Port Expanders
  • These are fine pitch surface mount parts
  • 32 Pushbutton Switches
  • 32 LEDs
  • 3.3V or 5V operation
  • Compatible form factor with RETRO-EP4CE15 and other cards
    • 95x95mm
    • 6-32 mounting holes

Schematic

Drivers

  • I2C parts are standard MCP23017 drivers which are supported in Arduino and most microprocessors
  • PSoC driver GitHub Repo