Datasheet

USB 2.0 Hub and 10/100 Ethernet Controller
Datasheet
SMSC LAN9512/LAN9512i 13 Revision 1.2 (02-29-12)
DATASHEET
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 2.2 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 LAN9512/LAN9512i 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 2.5 Ethernet PHY Pins
NUM
PINS NAME SYMBOL
BUFFER
TYPE DESCRIPTION
1
Ethernet TX
Data Out
Negative
TXN AIO Negative output of the Ethernet transmitter. The
transmit data outputs may be swapped internally
with receive data inputs when Auto-MDIX is
enabled.
1
Ethernet TX
Data Out
Positive
TXP AIO Positive output of the Ethernet transmitter. The
transmit data outputs may be swapped internally
with receive data inputs when Auto-MDIX is
enabled.
1
Ethernet RX
Data In
Negative
RXN AIO Negative input of the Ethernet receiver. The receive
data inputs may be swapped internally with
transmit data outputs when Auto-MDIX is enabled.
1
Ethernet RX
Data In Positive
RXP AIO Positive input of the Ethernet receiver. The receive
data inputs may be swapped internally with
transmit data outputs when Auto-MDIX is enabled.
7
+3.3V Analog
Power Supply
VDD33A P Refer to the LAN9512/LAN9512i reference
schematics for connection information.
1
External PHY
Bias Resistor
EXRES AI Used for the internal bias circuits. Connect to an
external 12.4K 1.0% resistor to ground.
1
Ethernet PLL
+1.8V Power
Supply
VDD18ETHPLL P Refer to the LAN9512/LAN9512i reference
schematics for additional connection information.
Table 2.4 USB Pins (continued)
NUM
PINS NAME SYMBOL
BUFFER
TYPE DESCRIPTION