Wiring configuration for Firefly® MV miniature IEEE-1394 connector

Part Numbers

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.

Pin Configurations

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-
TPA+ → TPB+
TPB z- → TPA-
TPB+ →  TPA+

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.