LAN9514 datasheet(13/49 Pages) SMSC

13 / 49 page

USB 2.0 Hub and 10/100 Ethernet Controller

Datasheet

SMSC LAN9514/LAN9514i

Revision 1.0 (11-24-09)

DATASHEET

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.

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.

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.

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.

External USB

Bias Resistor

USBRBIAS

Used for setting HS transmit current level and on-

chip termination impedance. Connect to an

external 12K 1.0% resistor to ground.

USB PLL +1.8V

Power Supply

VDD18USBPLL

Refer to the LAN9514/LAN9514i reference

schematics for additional connection information.

Crystal Input

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

Crystal Output

OCLK

External 25 MHz crystal output.

Table 2.4 USB Pins (continued)

NUM

PINS

NAME

SYMBOL

BUFFER

TYPE

DESCRIPTION

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