Technical Application Notes
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Technical Application Notes


 

 

Wiring configuration for Firefly® MV miniature IEEE-1394 connector

Technical Application Note TAN2006007

Revised March 4, 2010

 

Subject

Technical Application Note (TAN2006007): Wiring configuration for Firefly MV miniature IEEE-1394 connector.

10408

Applicable Product(s)

  • Firefly MV part numbers 97-00100-06900 (mono) and 97-00100-07300 (color)

 

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.

 

Always power down all system components before connecting to the 6-pin IEEE-1394 connector. Do not ‘hot plug.’ Unlike standard IEEE connectors, the ground pin of this connector does not make contact before other circuits. If components are not powered down before connecting, power may make contact before ground, which may cause damage to the camera.

 

Do not de-solder the 6-pin IEEE-1394 connector from standard Firefly MV FFMV-03MT-XX models. Modifying the Firefly MV printed circuit board (PCB) in any way will void your Hardware Warranty.

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.


Figure 1: Back face of the Firefly MV printed circuit board

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:

Pin

Function

1

Shield

2

Power Input (+8 to +32 VDC)

3

DC GND

4

TPB-

5

TPB+

6

TPA-

7

TPA+

8

Shield

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)

Pin

Function

1

Power Input (+8 to +32 VDC)

2

DC GND

3

TPB-

4

TPB+

5

TPA-

6

TPA+

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. 

able configuration for JST connector on camera

Cable configuration for
host side

Pin 1
Shield

Shield

Pin 2
Power Input

Pin 1
Power Input

Pin 3
DC GND

Pin 2
DC GND

Pin 4
TPB-

Pin 5
TPA-

Pin 5
TPB+

Pin 6
TPA+

Pin 6
TPA-

Pin 3
TPB-

Pin 7
TPA+

Pin 4
TPB+

Pin 8
Shield

Shield