2022-7-20 Backplane Meeting

Date

13 Jul 2022

Topic

Notes

Sleep on additional tradeoffs not enumerated here: 2022-7-13 Backplane Meeting

Don't need to find specific switch ICs right now, but keep in mind

Think about connectors

Breakout I/O from each module through backplane instead of having individual breakouts on each module
- Each backplane port has a unique pair of GPIO pins sent to e.g. a DE-25
- All GPIO in one place for ease of integration
- Less of a rats nest of wires in the av bay

Modules: Sensor/Battery, Power, Radio/Data Capture, Video, Deployment, Reaction Wheel Control,

Function	Implementation	What module?	GPIO Pin Count
Acceleration	Accelerometer(s)	Sensors	0
Altitude	Processing intertial, pressure, temperature, GPS data	Sensors	0
Temperature	Thermistor, i2c device	Sensors	0
Compass	Magnetometer	Sensors	0
Pressure	Barometer	Sensors	0
Remote Temperature	Thermocouple, lmt86-like chip	Sensors	2x3 = 6
GPS	GPS IC, L-band antenna, 70cm antenna + transmitter	GPS	1
Pitch/Roll/Yaw/Spin	Gyroscope	Sensors	0
Radio Telemetry	LoRa transceiver	Radio/Data Capture	0
Video Transmission	Video transmitter	Video Transmission	0
Video Capture	Camera	Video Transmission	0 + Dedicated Connector
Electric Motor control	motor controller BLDC	Arbitrary new control module	8
Power IO: Multiple Deployment control +Smoke	Switching circuit, GPIO	Deployment	12
Sound, high frequency vibration	Microphone, amplifier, ADC	Sensors	0
Power Distribution	Switching power supplies, LDOs	Power Distribution	0
Umbilical	Hardware connectors		2
Recovery Buzzer	Piezo buzzer		2
Recovery Light	Connector for externally-mounted Big LED		2
RTC	RTC IC	Sensors	0
Data Storage	Flash chips	Radio/Data Capture	0
Arbitrary control signal	GPIO	Arbitrary new control module	2x5 = 10
Servo Control	GPIO, External Power	Arbitrary new control module	3
Smoke Grenade	External smoke generator & GPIO	Arbitrary new control module	2x2 = 4
Power Consumption Monitoring	Shunt and ADC (self-contained?)		0
External Status Light	GPIO for external LED	Radio/Data Capture?	2x4 = 8
Overcurrent/UVLO	E-Fuse IC, Polyfuse, etc, Load switch IC, Fets, etc.		0
Power Sequencing

12 pins at 3A

24 pins at 1A

+6 power wires (VBat, 5v, 3.3v, GND, GND, GND)

+ 4 Ethernet