1. Board size should comply with PC/104 Standard
    1. Mounting holes at all 4 corners (see standard for what this should look like)
    2. PC/104 connector to mate with other subsytem boards
    3. HARD constraint on board size to be 90mm by 90mm
    4. Height should not exceed 12mm
  2. An operating temperature between -40°C and 85°C should be assumed and every component constituting the OBC should be able to operate within this range
  3. Temperature Sensor
    1. An onboard temperature sensor must be available to keep track of temperature changes onboard the OBC
  4. Buck Converter
    1. Step down 3.3V to 1.2V
    2. Should be able to provide up to 1A of current
    3. Ensure a separate power port for 3V3 (header pins so we can use a power supply
  5. Power protection
    1. Decide whether we’re using an eFuse or just adding our own reverse polarity protection
  6. Real Time Clock (RTC)
    1. Ideally should use SRAM, i.e. non-volatile memory such that loss of power does not cause a full flush of RTC parameters
    2. Alarms
  7. microSD Card
    1. The microSD needs its own SPI port. There are issues with having it share a port with FRAM
      • microSD cards don’t seem very reliable. For future competitions, NAND flash or eMMC would probably be better. or SD card
  8. FRAM
  9. CAN Transceiver
  10. Oscillator
  11. JTAG Header
    1. QUADRUPLE CHECK that we have the right JTAG header with the right pinouts that will work correctly with out J-Link
  12. Reset Button
    1. Confirm whether we are just using the “power-on reset” button or breaking out the “warm reset” button too
  13. External Watchdog Monitor
  14. Umbillical Cord
    1. What will this look like?
  15. PC 104 Pinout @Kiran Surendran confirm this with other teams Electrical Bus Architecture
    1. Comms: SPI + I2C
    2. EPS: CAN, getting 3V3
    3. Payload : I2C+SPI x 2, I2C
    4. ADCS: UART, PWM x 3, SPI x 6, PWM x 4

General Notes