Datasheet

© 2008 Fairchild Semiconductor Corporation www.fairchildsemi.com
FUSB2805 • Rev. 1.0.3 32
FUSB2805 — USB2.0 High-Speed OTG Transceiver with ULPI Interface
Pull-Up and Pull-Down Resistors
The FUSB2805 integrates the DP and DM termination
resistors required to initiate data line pulsing. The pull-
up and pull-down resistors are connected according to
Table 4.
Please refer to ULPI specifications, section 3.8.7, for
details on OTG functionality with respect to ULPI or
OTG supplement Rev. 1.3 for USB2.0. Please refer to
ULPI specifications section 3.8.7.3 for further detail on
OTG V
BUS
comparator thresholds.
Table 13. RXCMD V
BUS_VALID
Over-Current Conditions
Typical
Application
UseExternal
V
BUS
Indicator
IndicatorPass
Thru
Indicator
Complement
RXCMD V
BUS
Valid Source
OTG Device
0
Don‟t Care
Don‟t Care
Internal V
A_VBUS_VLD
comparator
1
1
0
External active HIGH V
A_VBUS_VLD
signal
1
1
1
External active LOW V
A_VBUS_VLD_N
signal
1
0
1
External active HIGH power fault signal
qualified with internal V
A_VBUS_VLD
comparator
1
0
0
External active LOW power fault signal
qualified with internal V
A_VBUS_VLD
comparator
Standard Host
1
1
0
External active HIGH power fault signal
1
1
1
External active LOW power fault signal
Standard
Peripheral
0
Don‟t Care
Don‟t Care
Internal V
A_VBUS_VLD
comparator
Internal VbusValid
V
BUS
ExternalVbusIndicator (Fault)
IndicatorComplement
ComplementOutput
(UseExternalVbusIndicator, Indicator PassThru)
RXCMD VbusValid
(0,X)
(1,0)
(1,1)
+
-
Figure 20. Graphical Representation of the RXCMD V
BUS
-Valid