Functions

The sun sensor will provide attitude determination azimuthally from the point of liftoff to the separation event. The sun sensor is a linear diode device providing a dynamic range of +/- 60 degrees. A signal conditioning circuit provides a single analog channel output of 0-5 V and less than 50 Hz. Its total power requirement is 0.6 W with current consumption estimates found in Table 3.3.1.2.

Interface Requirements

The sun sensor interfaces with 3 other systems: the flight computer, the power supply, and the payload architecture. Figure 3.3.3.2 shows the placement of the sensor on a payload tube faceplate and the placement of the sensor PCB above the flight instrument PCB’s on deck plate #2. Sun sensor specifications include:

Size: 114.3 mm x 35 mm x 30 mm (4.5 in x 1.38 in x 1.1 in)
Mass: 100 g (0.22 lbs)
Mounting holes 6.65 mm (0.2618 in) in “L” bracket.
Sensor connector: shall be on a 5 cm (2 in) lead.
Slot size: 10 mm x10 mm (0.4 x 0.4 in).

Sun Sensor PCB specifications

Size: 60 mm x 60 mm x 10 mm (2.36 in x 2.36 in x 0.39 in). Mass: 30 g (0.066 lbs) PCB sensor connector: shall be on a 25 cm (10 in) lead. Data connector type: Molex Male Header #22-12-2044. Power connector type: Molex Male Header #22-12-2044. Number of mounting holes per PCB: 4 each 3 mm holes. Number of standoffs per PCB: 4.

Table 3.3.3.1: Sun sensor connector pin assignments.

Connector	Part Number	Pin Number	Items
Data	22-12-2041	J1-1	Lo
Data	22-12-2041	J1-2	Hi
Data	22-12-2041	J1-3
Data	22-12-2041	J1-4	GND
Power	22-12-2044	J2-1	+15 V
Power	22-12-2044	J2-2	-15 V
Power	22-12-2044	J2-3	+5 V
Power	22-12-2044	J2-4	GRD