Datasheet

LAN8740A/LAN8740Ai
DS00001987A-page 12  2013-2015 Microchip Technology Inc.
Note 1: Configuration strap values are latched on power-on reset and system reset. Configuration straps are iden-
tified by an underlined symbol name. Signals that function as configuration straps must be augmented with
an external resistor when connected to a load. Refer to Section 3.7, "Configuration Straps" for additional
information.
1 LED 2 LED2 O12 This pin can be used to indicate link activity, link
speed, nINT, or nPME as configured via the LED2
Function Select field of the Wakeup Control and
Status Register (WUCSR).
Note: Refer to Section 3.8.1, "LEDs" and Sec-
tion 3.8.4, "Wake on LAN (WoL)" for
additional LED information.
Interrupt Out-
put
nINT O12 Active low interrupt output.
Note: By default, the nINT signal is output on
the nINT/TXER/TXD4 pin. The nINT
signal can be optionally configured to
output on the LED1 or LED2 pins. Refer
to Section 3.6, "Interrupt Management"
for additional details on device inter-
rupts.
Power Man-
agement Event
Output
nPME O12 Active low Power Management Event (PME) out-
put.
Note: The nPME signal can be optionally con-
figured to output on the LED1, LED2, or
RXD2/nPME/nINTSEL
pins. Refer to
Section 3.8.4, "Wake on LAN (WoL)" for
additional nPME and WoL information.
nINT/TXER/
TXD4 Function
Select Configu-
ration Strap
nINTSEL IS
(PU)
This configuration strap selects the mode of the
nINT/TXER/TXD4 pin.
• When nINTSEL
is floated or pulled to VDD2A,
nINT is selected for operation on the
nINT/TXER/TXD4 pin (default).
• When nINTSEL
is pulled low to VSS,
TXER/TXD4 is selected for operation on the
nINT/TXER/TXD4 pin.
See Note 1 for more information on configuration
straps.
Note: Refer to See Section 3.8.1.6, "nINTSEL
and LED2 Polarity Selection" for addi-
tional information.
TABLE 2-2: LED PINS (CONTINUED)
Num Pins Name Symbol Buffer Type Description