LB-68B50-01

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LB-6850-01 FRONT REV2(BLK).png

Features

  • Serial/Parallel I/O Card
  • 68B50 UART
  • 1.8432 MHz oscillator
    • Baud Rate Clock (38.4k baud oscillator)
  • XIAO RP2040 CPU
    • USB/Serial
  • 8-bit parallel port expander
  • SD card
  • 100x50mm card

Design

ACIA

LB-68B50-01 ACIA.PNG

  • 68B50 UART
  • Baud Rate Clock (38.4k baud oscillator)

XIAO RP2040 CPU

LB-68B50-01 RP2040.PNG

  • USB/Serial
  • Drive SPI I2C 8-bit parallel port expander
  • SD card

Parallel I/O Port

LB-68B50-01 MCP23008L.PNG

  • 3.3V levels

SD Card (Rev 2)

LB-68B50-01 SD CARDL.PNG

SD Card (Rev1)

LB-68B50-01 SD CARD Rev1.PNG

  • Need to not install level translators
  • Need to short across the SD card lines

Backplane

LB-68B50-01 BKPL.PNG

Mechanicals

Rev 2

LB-68B50-01 Rev2 MECHS.PNG

Rev 1

LB-68B50-01 MECHS.PNG

Checkout

Rev 2

  • Removed U2 voltage translator

Rev 1

LB-6850-01 FRONT REV1(BLK).png

  • Do not install level translator U3
  • Short across the SD card lines
    • Jumper U2-13 to U2-2
    • Jumper U2-12 to U2-3
    • Jumper U2-11 to U2-4
    • Jumper U2-10 to U2-5
  • Cut edge U1-8
  • Cut edge U1-10
  • Add jumper U1-8 to U1-10 to U1-12

Assembly Sheet

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