Summary of IEEE 1394 Single And Dual Port FireWire Protective Circuits
The IEEE 1394 (FireWire) protective circuits design uses MAX5943A for single-port and MAX5944 for dual-port implementations to provide adjustable 2.5A current limiting, 2 ms adjustable timeout, automatic restart after fault, undervoltage shutdown, low-drop O-Ring for multiple power sources, and fault reporting. The design targets IEEE 1394 ports using TE Connectivity 1734290-1 connectors and supports high-speed serial connections up to 400 Mbps with plug-and-play compatibility.
Parts used in the FireWire Protective Circuit Design:
- MAX5943A (single-port FireWire protection IC)
- MAX5944 (dual-port FireWire protection IC)
- TE Connectivity 1734290-1 FireWire connector
- Twisted-pair wiring (for IEEE 1394 serial bus)
The IEEE 1394, which is also called FireWire by Apple, is an interface standard for high-speed serial bus for connecting devices to a personal computer. Like USB, IEEE 1394 is a serial bus that uses twisted-pair wiring to move data around. However, USB is limited to 12Mbps, IEEE 1394 currently handles up to 400Mbps. The reference design illustrates single and dual port FireWire protective circuits. The single-port FireWire protective circuit is designed using the MAX5943A, while the dual-port FireWire protective circuit utilizes the MAX5944.
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.
For more detail: IEEE 1394 Single And Dual Port FireWire Protective Circuits
- What IC is used for single-port FireWire protection?
The MAX5943A is used for single-port FireWire protection. - What IC is used for dual-port FireWire protection?
The MAX5944 is used for dual-port FireWire protection. - What connector is used for the FireWire port in this design?
The TE Connectivity 1734290-1 connector is used for the FireWire port. - How much adjustable current limiting does the circuit provide?
The circuit provides a 2.5A adjustable current limiting to the load. - What is the adjustable current-limit timeout for excessive load current?
The design provides a 2 ms adjustable current-limit timeout for excessive load current. - Does the circuit attempt to restart automatically after a fault shutdown?
Yes, it automatically attempts to restart after a fault shutdown condition. - What undervoltage protection is provided?
The circuit includes 6.5V undervoltage shutdown protection. - Does the design support multiple power sources?
Yes, it provides a low-drop O-Ring for multiple-power-source applications. - Is there fault reporting in the design?
Yes, the design includes fault reporting.
