Browse KB Articles
Wiring configuration for Firefly® MV miniature IEEE-1394 connector
KB Number: 10581
Technical Application Note TAN2006007
Revised March 4, 2010
Technical Application Note (TAN2006007): Wiring configuration for Firefly MV miniature IEEE-1394 connector.
Application Note Description
The purpose of this Technical Application Note is to document the part number and pin configuration of the connector used on the Firefly MV model listed above. This will allow users to create their own custom IEEE-1394 cable for connecting to the miniature IEEE-1394 connector.
There are two connectors mounted on the back of the Firefly MV PCB, as shown Figure 1 below. Both connectors are made by JST Sales America and are available through Digikey.
The part number for the miniature 8-pin vertical IEEE-1394 connector that is connected to the Firefly MV printed circuit board is BM08B-SRSS-TB(LF)(SN). It is made by JST Sales America. The female JST counterpart for this connector, which users must source and purchase themselves, is part number SHR-08V-S-B. This can be purchased through Digikey using Digikey part number is 455-1383-ND. Users will also require JST crimping part number SSH-003T-PO.2 in order to wire into the female connector as shown in Figure 1 above. This can also be purchased through Digikey using Digikey part number 455-1561-1-ND.
Miniature Vertical IEEE-1394 Connector
The pin configuration for the miniature vertical 8-pin IEEE-1394 JST connector, starting from the top (Pin 1) of the connector shown in Figure 1, is as follows:
Standard IEEE-1394 Connector
For user reference, the pin configuration for the standard 6-pin IEEE-1394 connector is shown below, as it appears on a cable:
Figure 2: IEEE-1394 connector pin configuration (as it appears on cable)
The signal on the Twisted Pair A is 1.0V DC. This voltage is then detected on the Twisted Pair B signal line; levels of 0.6 to 1.0V DC are used to determine when a device has been removed or added i.e. device attached >= 1.0V, device not attached <= 0.6V
Mapping the Connection from Camera to Host
In a standard 1394 cable, the Twisted Pair A and Twisted Pair B connections transpose from camera to host in the following manner:
TPA- → TPB-
The following table shows how the connections should map from one end of a custom cable to another end. The left column shows the pins on the cable that connect to the 8-pin JST connector on the camera. The right column shows the pins on the cable that connect to a standard IEEE-1394 6-pin interface card connector.