2022 Backplane
| Module | 3.3V Rail Max Required Current (mAh) | 5V Rail Max Required Current (mAh) | 7.2V Battery Max Required Current (mAh) |
|---|---|---|---|
| Backplane | 0 | 0 | 60 |
| Power | 0 | 0 | 945 (from calculation below) |
| Autopilot | 0 | 500 | 1000 |
| Radio | 565 | 0 | 0 |
| Sensor | 400 | 100 | 0 |
| Total | 965 | 600 | 2005 |
Power Board Battery Draw Calculation
Assume 90% step down efficiency
Power = (965mAh * 3.3V + 600mAh * 5V) * 1.1 = 6,803mWh
Amp-hours = 6,803mWh / 7.2V = 945mAh
2022 Backplane & Future-proofing
| Module | 3.3V Rail Max Required Current (mAh) | 5V Rail Max Required Current (mAh) | 7.2V Battery Max Required Current (mAh) |
|---|---|---|---|
| Backplane | 0 | 0 | 60 |
| Power | 0 | 0 | 2212 (from calculation below) |
| Autopilot | 0 | 500 | 1000 |
| Radio | 565 | 0 | 0 |
| Sensor | 400 | 100 | 0 |
| Future Board(s) Allotment | 1000 | 1000 | 1000 |
| Total | 1965 | 1600 | 4272 |
Power Board Battery Draw Calculation
Assume 90% step down efficiency
Power = (1965mAh * 3.3V + 1600mAh * 5V) * 1.1 = 15,933mWh
Amp-hours = 15,933mWh / 7.2V = 2,212mAh
Takeaways
- Battery shall be able to handle 4,272mAh transient power draw @ 7.2V
- Battery shall be able to handle 3,272mAh continuous power draw @7.2V
- 5V circuitry shall be able to supply 1600mAh
- 3.3V circuitry shall be able to supply 1965mAh
- All traces shall be rated for their appropriate current requirements
- 3.3V → 1965mAh max
- 5V → 1600mAh max
- 7.2V → 4272mAh max