SMSC LAN9514 - Manual (Page 13)

USB Hub with Integrated 10/100 Ethernet Controller
Datasheet
SMSC LAN9514 13 Revision 1.0 (04-20-09)
DATASHEET
1
USB Port Power
Control 2
PRTCTL2 IS/OD12
(PU)
When used as an output, this pin enables power to
downstream USB peripheral 2.
When used as an input, this pin is used to sample
the output signal from an external current monitor
for downstream USB peripheral 2. An overcurrent
condition is indicated when the signal is low.
Refer to Section 2.1 for additional information.
1
USB Port Power
Control 3
PRTCTL3 IS/OD12
(PU)
When used as an output, this pin enables power to
downstream USB peripheral 3.
When used as an input, this pin is used to sample
the output signal from an external current monitor
for downstream USB peripheral 3. An overcurrent
condition is indicated when the signal is low.
Refer to Section 2.1 for additional information.
1
USB Port Power
Control 4
PRTCTL4 IS/OD12
(PU)
When used as an output, this pin enables power to
downstream USB peripheral 4.
When used as an input, this pin is used to sample
the output signal from an external current monitor
for downstream USB peripheral 4. An overcurrent
condition is indicated when the signal is low.
Refer to Section 2.1 for additional information.
1
USB Port Power
Control 5
PRTCTL5 IS/OD12
(PU)
When used as an output, this pin enables power to
downstream USB peripheral 5.
When used as an input, this pin is used to sample
the output signal from an external current monitor
for downstream USB peripheral 5. An overcurrent
condition is indicated when the signal is low.
Refer to Section 2.1 for additional information.
1
External USB
Bias Resistor
USBRBIAS AI Used for setting HS transmit current level and on-
chip termination impedance. Connect to an
external 12K 1.0% resistor to ground.
1
USB PLL +1.8V
Power Supply
VDD18USBPLL P Refer to the LAN9514 reference schematics for
additional connection information.
1
Crystal Input XI ICLK External 25 MHz crystal input.
Note:
This pin can also be driven by a single-
ended clock oscillator. When this method
is used, XO should be left unconnected
1 Crystal Output XO OCLK External 25 MHz crystal output.
Table 2.4 USB Pins (continued)
NUM
PINS NAME SYMBOL
BUFFER
TYPE DESCRIPTION