Hardware/CubeSat Gumstix

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This board is the result of a diploma work. It is meant to be a first evaluation version of a Cubesat image processing board.

Type FPGA Rack Schematic UCF Description
2015 FPGA + Gumstix 2015 FPGA + Gumstix 2015 Schematic FPGA + Gumstix 2015 UCF FPGAs: Spartan 6 XC6SLX45, XC6SLX100 or XC6SLX150
SPI flash: M23P64-ME

Components

Camera

The camera interface connector comprises:

  • a 3.3 V power supply
  • a 2-line serial interface (UART or I2C)
  • <fval, lval dval>
  • a pixel clock (PCLK)
  • 12 data bits (D11 ÷ D0)
  • 4 control lines (CC1 ÷ CC4)

ADC

The board hosts a ADS8028 12-bit, 1 MSPS, 8-channel analog-to-digital converter.

The voltage reference input connects to the analog power supply via jumper J5. Inputs AIN0 to AIN4 are used to monitor the board's power supplies. Inputs AIN5 to AIN7 are sourced by connector J9.

Power supplies

The board receives a 5 V power input. 4 DC/DC converters provide power for different components.

FPGA supply

On the FPGA:

  • VCC33 is used by the FPGA for VCCAUX, the SPI flash, the JTAG connector, bank 0 and bank 3
  • VCC18/33 is used for FPGA bank 1
  • VCC25/33 is used for FPGA bank 2
  • VCC12 is used for the FPGA core

Bank 0 connects to the camera and the ADC

Bank 1 is connected to the Gumstix and 1.8 V should be used. The Gumstix board could be replaced by a memory board which might require 3.3 V signalling

Bank 2 connects to the On-Board Computer (OBC)

Bank 3 connects to the spare connectors on the side of the board.

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