Datasheet

TPA+
TPA-
TPB+
TPB-
Cable Port
CPS
TPBIAS
56 Ω56 Ω
56 Ω56 Ω
5 kΩ
1 µF
400 kΩ
270 pF
(see Note A)
Cable
Power
Pair
Cable
Pair
A
Cable
Pair
B
Outer Shield
Termination
VP
VG
1 MΩ
0.1 µF
270 pF
TPA_REFGND
TPB_REFGND
NOTE A: The IEEE Std 1394- 1995 calls for a 250-pF capacitor, which is a nonstandard component value. A 270-pF capacitor is recommended.
TSB81BA3E
TSB81BA3E
www.ti.com SLLS783A –MAY 2009–REVISED MAY 2010
Table 9. Power-Class Descriptions
PC0-PC2 DESCRIPTION
000 Node does not need power and does not repeat power
001 Node is self-powered and provides a minimum of 15 W to the bus.
010 Node is self-powered and provides a minimum of 30 W to the bus.
011 Node is self-powered and provides a minimum of 45 W to the bus.
Node can be powered from the bus and is using up to 3 W; no additional power is needed to enable the link. The node
100
can also provide power to the bus. The amount of bus power that it provides can be found in the configuration ROM.
101 Reserved for future standardization.
110 Node is powered from the bus and uses up to 3 W. An additional 3 W is needed to enable the link.
111 Node is powered from the bus and uses up to 3 W. An additional 7 W is needed to enable the link.
Figure 4. Typical TP Cable Connections
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