This page has documentation for the front panel board on the APOLLO blade service module. This is a small PCB which provides a reset/control button, USB console interface and uSD card.

Notes for Rev D

Restarting January 2022

  • Rev C schematic: Blade_FP.pdf
  • Schematic page for the SM Rev2a FP board interface pdf
    • J207 is 1.8V only and these six GPIOs go directly to the Zynq!
    • J40 signals LED_SCL, LED_SDA, LED_RST, and FP_BUTTON are 3.3V and go directly to the Zynq and can be GPIOs
    • J46 signals can ONLY be used for an SD card (you can use the ground pins)
  • FrontPanelDisplayTest -- proposed board to test out displays

Proposed changes:

  • Remove the SD card and associated circuitry.
  • Add the new SM connector for more I/Os
    • This is a third header connector next to the existing two
  • Possibly re-think the display... replace LEDs with a small OLED screen?
  • Maybe add a small GPIO connector


  • Possible displays:
    • DigiKey 3837-ELW0501AB-ND (OLED 0.5 inch class with flexi cable)
    • DigiKey 516-1173-5-ND (4 character 5x7 matrix LED) Broadcom HCMS-2903
      • DigiKey A803AR-ND right-angle socket
  • 1S7BE_0305S6U - 3.3V/5V DC/DC converter

Display options (below). I think the 4-character 5x7 matrix is probably the best. It's footprint is a convenient DIP-12 of standard size. Unfortunately the nice right-angle socket probably doesn't fit (have to double-check) so we would need to make an additional small right-angle PCB to hold the display.

The OLED screen is cool but availability of the displays and in particular the connectors is iffy.

Last modified 20 months ago Last modified on Feb 1, 2022, 9:09:33 PM

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