LAN9211 datasheet(18/147 Pages) SMSC

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High-Performance Small Form Factor Single-Chip Ethernet Controller with HP Auto-MDIX Support

Datasheet

Revision 2.9 (03-01-12)

SMSC LAN9211

DATASHEET

Note 2.1

Please refer to the SMSC application note AN16.6 - “Migrating from LAN9215 to the

LAN9210/LAN9211” for additional details.

General Purpose

I/O data,

nLED1 (Speed

Indicator),

nLED2 (Link &

Activity Indicator),

nLED3 (Full-

Duplex

Indicator).

GPIO[2:0]/

nLED[3:1]

IS/O12/

OD12

General Purpose I/O data: These three

general-purpose signals are fully programmable

as either push-pull output, open-drain output or

input by writing the GPIO_CFG configuration

as GP LED connections.

GPIO signals are Schmitt-triggered inputs.

When configured as LED outputs these signals

are open-drain.

nLED1 (Speed Indicator). This signal is driven

low when the operating speed is 100Mb. During

auto-negotiation, when the cable is

disconnected, and during 10Mbs operation, this

signal is driven high.

nLED2 (Link & Activity Indicator). This signal

is driven low (LED on) when the LAN9211

detects a valid link. This signal is pulsed high

(LED off) for 80mS whenever transmit or

receive activity is detected. This signal is then

driven low again for a minimum of 80mS, after

which time it will repeat the process if TX or RX

activity is detected. Effectively, LED2 is

activated solid for a link. When transmit or

receive activity is sensed LED2 will flash as an

activity indicator.

nLED3 (Full-Duplex Indicator). This signal is

driven low when the link is operating in full-

duplex mode.

+3.3V I/O Power

VDD_IO

+3.3V I/O logic power supply pins

Common Ground

VSS

1 pad

Common Ground

+3.3V Analog

Power

VDD_A33

+3.3V analog power supply pins. See Note 2.1.

+1.8V Analog

Power

VDD_A18

+1.8V analog power supply pin. This pin must

be connected externally to VDD_CORE. See

Note 2.1.

Core Voltage

Decoupling

VDD_CORE

+1.8 V from internal core regulator. Both pins

must be connected together externally. Each

pin requires a 0.01uF decoupling capacitor. In

addition, pin 2 requires a bulk 4.7uF capacitor

(<2 Ohm ESR) in parallel. These pins must not

be used to supply power to other external

devices. See Note 2.1.

Table 2.4 System and Power Signals (continued)

NAME

SYMBOL

BUFFER

TYPE

NUM

PINS

DESCRIPTION

LAN9211 Datasheet(PDF) 18 Page - SMSC Corporation

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