Chapter 7: sDIO Module SmartController EX User’s Guide, 11069-000 Rev. F Page 71 of 92 Table 7-3. sDIO Chassis LEDs Illumination Upper LED (LINK) Lower LED (OK SF) None No IEEE 1394 link Local software not running Blinking Green Not Applicable Local software active, not configured in eV+ Solid Green IEEE 1394 link good Local software active, and configured in eV+ Blinking Red Not Applicable Output fault Solid Red Not Applicable Output fault A diagnostic software indicator is not available for the XDIO outputs. In a short-circuit con- dition, the XDIO outputs will simply fold back, supplying the maximum short-circuit current to the output pin.
O Output Power Supply Current Selection The nine power pins for each group are connected together on the sDIO module’s board, and the current supplied from the output pins is drawn from these power pins. The number of power pins used in a particular application depends on the total current supplied through that group’s outputs. A total of nine power pins are provided to allow for more wire connections to decrease the voltage drop across the power supply wires. The supply current should be limited to a maximum of one amp per power pin. Use this lim- itation to select the number of power pins you need.
For example, each output can source up to 700 mA, giving a maximum total current (for a group of eight outputs) of 5.6 A that will be required from the power supply. In this case, a minimum of six power pins should be used. If you experience an excessive voltage drop, make connections to additional power pins. The ground connection should connect to the power supply directly, not the ground con- nection of the load. This will isolate the board from any voltage drop across the ground return for the load.