IEEE 1394 Single And Dual Port FireWire Protective Circuits

The circuit provides a 2.5A adjustable current limiting to the load at initial connection or during an overcurrent fault condition. It also provides 2ms adjustable current-limit timeout for excessive load current. It automatically attempts to restart after a fault shutdown condition. Some other features involve; less than 8 percent current-limited duty cycle during continuous fault condition, 6.5V undervoltage shutdown protection, low-drop O-Ring in multiple-power-source applications, and fault reporting. The FireWire port used in this design is the TE Connectivity's 1734290-1. This connector conforms to IEEE 1394 standard with easy connections to equipment for use with plug and play devices.

This reference design is intended for circuit protection of IEEE 1394 single and dual port FireWire. It is applicable to wide ranges of PC connections, AV equipment and other related peripherals. It is also useful for automatic mounting machines with embossed tapes.