BUS PIRATE: Ultra v1c board update

Bus Pirate prototype “Ultra” version 1c is technically done, but we came up with some hot last minute additions this weekend. We’ll skip this board and send out the updated version 1d with the additional features at the end of the week.

Version 1c changes:

  • 4 layer PCB
  • 1MHz 12 bit SPI ADC connected directly to the FPGA
  • Vout/Vref is also measured through the analog multiplexer, which is changed to to the bigger 16bit version (74HCT4067). This will probably change to two 74HCT4051s instead because supplies of the 4067 are skimpy! We can have one “divide by two” 4051 for 5volt measurements on the IO pins, and one 3.3volt 4051 tied directly to the ADC for measuring lower voltage analog stuff
  • Beefier 3.3volt supply
  • The 1.2volt supply is now monitored by the MCU for self testing
  • 0.5mm flex cable connector for the display board opens up a bit of board space
  • Additional ADC measurement point before the back-current shut down protection on the power supply. This gives us a way to include it in the self test and detect when it activates

Boards and schematics are in our git repo, and you can follow the latest developments in the forum.

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