ROSS PDB

This page will document the main Power Distribution Board for ROSS when the documentation is completed.

These are the features of the latest version of this board.

20v reference
10v precision reference
5v supply capable of 10A
3v3 supply
2v5 reference
4x current sense
- 5v Throttle servo
- 5v System power
- 5v Computer power
- 12v Steering servo
Voltage scaling for external current sense (XTend Daughterboard)
R/C Reciever power output
XTend Daughterboard power output
Iridium Location Beacon power output
Computer power output
Steering servo power output
Protection against backfeeding power from all components that might need to be powered separately (Pixhawk, Auxillary board)
Fuses the alternator power from the engine to the steering servo
Allows switching on/off of the power to the steering servo while operational
Logic Level Conversion for the 3v3 outputs of the Pixhawk into 5v PWM signals for throttle and steering
Voltage rail current sense (using a differential OpAmp multiplier)
Dual FT2232 UART Chip to support modem communication (see XTend Daughterboard)
Supports an ATxmega32E5 Microcontroller running at 32MHz
- Supports remote steering servo override (using hardware PWM generation)
- Internal EBox Temperature monitoring
- Current Sensing
- Voltage Sensing
- On/Off Switch passthrough (see internal documentation for more)

R24 should be replaced with a 1K if power diodes (D2, D15, D17, D19, D20) are used .

ROSSPowerDistribution Schematic v2 (download for 3D PCB render, requires Adobe Reader/DC)

Note: BOM v2 works for board hardware v2 and v2.1

Nick McComb