Mini LHC Display

The CERN Mini LHC Display will be a prototype display board for the CERN Mimic Panel. Since the final LHC board will be large and therefore expensive, I'm starting with a mini version which can test the overall architecture but be smaller if it requires a re-spin.

Status

• 2025-05-13: Put schematic together for the beam LEDs, and started putting schematic together for the misc. LEDs. Turns out I have slightly over 48 of those, so may need to eliminate a couple.
• 2025-05-12: Put design and schematic together for driving the energy and t(SB) displays, using an AS1115.
• 2025-05-10: Started putting BOM and schematic together, got the alphanumeric accel/beam display circuitry all laid out.
• 2025-04: Started putting design thoughts together

Design Thoughts

• discrete LEDs
  • beam LEDs for B1/B2 (24 each, 48 total)
  • beam IP LEDs (4 RGB, 12 channels total)
  • TI LEDs (4 per beam, 8 total)
  • dump LEDs (2 plus one RGB per beam, 10 channels total)
  • cryo status wrapup LED (1 bicolour, 2 channels total)
  • collimator status wrapup LED for each beam (2 bicolour, 4 channels total)
  • BIS/SMP - beam permit, movables allowed in, stable beams, permit link (4 bicolor)
• energy display (4x 7-segment LEDs)
• t(SB) display (hh:mm - 4x 7-segment LEDs plus a colon)
• 2x TLC5955
• 1x AS1115 for 7-segment displays
• 16x2 LED dot matrix displays for beam/accel status (built-in smarts, so no TLC5955 required)
• Would like a little LCD like the final one will have for displaying the Page1 comment, will see if there's space later on

MCU Needs

• I2C for link to controller
• SPI + 4 CS = 7 total pins for TLC5955s
• Shared SPI + 1 CS = 1 extra pin for AS1115
• 19 I/Os + 4 CSs = 23 total pins for dot matrix displays
• ~33 I/Os total