Each subsystem should have an interface control document (ICD). Detail the mechanical, electrical, data, thermal interfaces between this subsystem and other subsystems (what's unique to this project).
ELECTRICAL/POWER INTERFACE
Voltage Ranges
Power Consumption
Pinouts
MECHANICAL INTERFACE
Shock and vibration tolerances
Mass
Volume/Dimensions
Needed fixtures
THERMAL INTERFACE
Heat Capacity
Operational temperature range
Storage temperature range
Survival temperature range
Emissivity
CAN INTERFACE / DATA INTERFACE
Payload - CDH
Payload - Power
PLD receives power from a distributed power bus at unregulated battery voltage (Vbat = 6.4 +/- 0.4V) through distribution load switches that are operated by the Power module controller.
Power ON/OFF is controlled by a CAN-Controlled Load Switches and Monitors (CCLSM).
M3 or M4 fasteners with hex drive: Used for assembly throughout the shell
1x hinge: located between the payload reflector and the structure shell
1x hinge: located between the payload feed and the structure shell
Power ON/OFF is controlled by a CAN-Controlled Load Switches and Monitors (CCLSM) through the auxiliary CAN bus, which is commanded and controlled by the Power subsystem
2 CAN Bus connections: 1 for PWR and 1 for PLD
Data rate: 250 kbps
3 analog connection for thermistor.
1 2.92-SMA connection to the antenna.
3 thermistor to measure temperatures at different parts of the PLD
1 for the noise source
1 for the radiometer RF stage
1 for the ambient temperature of the PLD unit
Operational temperature range: -40°C to 85°C.
Survival temperature range: -40°C to 85°C.
The PLD subsystem provides ambient PLD temperature reading to the CDH over CAN
Software Interface