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https://github.com/oresat/oresat-star-tracker-hardware.git
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51 lines
1.6 KiB
Plaintext
51 lines
1.6 KiB
Plaintext
NOTES:
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- DONE: breakout out enable lines for voltage regulators
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- DONE: add at least 1 temp sensor
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- DONE: external clock should have an enable
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- NO:add schmidt trigger to test efficacy?
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- DONE: Do I need level shifting b/c max is 2.8v +0.2v
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-74avcb1642 Bus Tranceiver from schematic
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- VREGs
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- VDD: 1.8
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- VDD_IO: 2.8
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- VAA: 2.8
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- VAA_PIX: 2.8(maybe can be shared with VAA, though refernce design shows individual)
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- VDD_PLL: 2.8
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- LATER: power on sequence
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- attiny or RC circuit
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- NOPE: temp sensors on separate 12c lines???
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- temp sensor under center of image sensor or under image sensor ground pins
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- I2C Repeater on board. ONe of these could be useful on the processor board if separate from camera board.
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- temp sensor running at 3.3 but i2c is translated to 2.8. Just keep this in mind
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- calculate power dissipation of v-regs
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- lens correction EEPROM??
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- clock
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- clock buffer(might only be needed for level shifting)
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- Should I use a TCXO
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- DONE: 27MHz?
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- DONE: 100 ohm series resistor?
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- YES: Will 3.3v reg be enough for bus tranceiver and temp sensors
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- YES: Will 2.8v VDD_IO reg be enough for bus tranceiver and temp sensors
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- Ribbon Cable output and external input board
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- Reset Voltage Supervisor:TPS3800, to reset when voltage is OK, see dev board.
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- Signals pulled up/down with resistor, and possibilty to be broken out
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- Test points
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- DONE: clock enable on XO
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- DONE: level shifter enable
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- DONE: flash
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- DONE: vreg outputs
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- VREG Caps
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- Input: 1uf
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- NR: .01uf
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- output: 10uf
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- DONE: unpopulated pullups on 12c
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- connect output tranceiver enable and i2c repeater enable?
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NOTES:
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- Test points
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- Sense resistor on PSUs
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