10?/DIV>
R3**
R4**
C
LOAD
*
* C
LOAD
IS USER-SELECTED BASED
ON THE DEVICE REQUIREMENTS
** R3, R4, R7 AND R8 ARE OPTIONAL DISCHARGE
RESISTORS WHEN DEVICES ARE POWERED-OFF
Q1, Q2: ON SEMICONDUCTOR
R8
10?/DIV>
+
1394 PHY
AND/OR
USB PORT
DEVICE #2
R9**
R10**
C
LOAD
*
+
C3
0.1糉
R6
10?/DIV>
C6
0.1糉
ON1
FAULT1
ON2
FAULT2
DEVICE BAY
CONTROLLER
WITH 1394 PHY
AND/OR USB
V
ID
V
ON1
V
R1
V
GATE1
V
FAULT1
V
ON2
V
R7
V
GATE2
V
FAULT2
V
LKO
V
IH
V
IH
V
LKO
V
LKH
V
IL
FAULT 1 WAVEFORM SHOWN WITH C3
FAULT 2 WAVEFORM SHOWN WITHOUT C6
t4 t5
t1
t7
t8
1647-1/2/3 F13
t2
t9 t10
t11
t3
t6
Figure 13. V
ID
Power Controller with Fault Status and Retry Sequence