Power Supply Output
Power supply output
Non-isolated +5V and +12V power outputs are available on all the I/O connectors.
The power originates from the power input connector and not from the PCI Express connector. It is mandatory to connect a hard disk power supply cable to the power input connector if an application requires one or both of these power outputs.
The power supply outputs are protected by electronic fuses. Such circuit protects the PCB against damage and also avoids any perturbation on the system power supply during power on sequence/overload and short-circuits on the outputs.
The sum of the load currents drawn from the 5V outputs of the I/O connectors must be lower or equal to 1.0 A over the whole operating temperature range of the board.
The sum of the load currents drawn from the 12V outputs of the I/O connectors must be lower or equal to 1.0 A over the whole operating temperature range of the board.
The presence of +5V and +12V voltages on the power output pins is reported to the application by means of two IOPower flags. A signal can be registered to be informed when IOPower flags are changing state.
An IOPower flag is set when the voltage across the load exceeds the threshold voltage. The threshold voltages are:
- 3.1 V (+/- 1.3 V) for the +5V power output
- 7.3 V (+/- 3.1 V) for the +12V power output