GSE_LOGIC = is there GSE power connected? (1=yes, 0=no)
BAT_SEL = is GSE replacing the batteries? (1=yes, 0=no, the panels)
| BAT_SEL | GSE_LOGIC | State Description | BAT(0)/GSE(1) | SOL(0)/GSE(1) |
|---|---|---|---|---|
| 0 | 0 | during flight | 0 | 0 |
| 0 | 1 | GSE cuts in at solar panels | 0 | 1 |
| 1 | 0 | shouldn’t ever happen | 0 | 0 |
| 1 | 1 | GSE cuts in at batteries | 1 | 0 |
make sure multiplexers don’t go into any weird intermediate states when transitioning from GSE mimicking the solar panels during the day (BAT_SEL=0, GSE_LOGIC=1) to GSE mimicking the solar panels during eclipse (BAT_SEL=0, GSE_LOGIC=0)
based on this description: https://www.ti.com/lit/an/slvae51a/slvae51a.pdf?ts=1720646631200&ref_url=https%3A%2F%2Fwww.google.com%2F I reckon a power mux is what we need
that document says that manual control is preferred when there’s a microcontroller on board instead of automatic control (i.e. actual power mux)
instead of load switches, we’ll use fuses since we need fuses in series on those paths anyways
BAT_SEL = 3.3V
GSE_LOGIC = bring down to 3.3V with a resistor divider
https://www.digikey.ca/en/resources/conversion-calculators/conversion-calculator-voltage-divider
https://www.rfcafe.com/references/electrical/resistor-values.htm