LM3S8G62 Datasheet, PDF (1028/1096 Pages) Texas Instruments – Stellaris® LM3S8G62 Microcontroller

Signal Tables
OBSOLETE: TI has discontinued production of this device.
Table 22-12. Connections for Unused Signals (100-Pin LQFP)
Function
Signal Name
Pin Number
Acceptable Practice
Preferred Practice
ERBIAS
33
Connect to GND through Connect to GND through 12.4-kΩ
12.4-kΩ resistor.
resistor.
RXIN
37
NC
GND
RXIP
40
NC
Ethernet
TXON
46
NC
GND
GND
TXOP
43
NC
XTALNPHY^a
17
NC
XTALPPHY^a
16
NC
GND
NC
GND
GPIO
All unused GPIOs
-
NC
GND
HIB
51
NC
NC
VBAT
55
NC
GND
Hibernate
WAKE
50
NC
GND
XOSC0
52
NC
GND
XOSC1
53
NC
NC
No Connects
NC
-
NC
NC
OSC0
48
NC
GND
System
Control
OSC1
RST
49
NC
NC
64
Pull up as shown in Figure Connect through a capacitor to
5-1 on page 180
GND as close to pin as possible
a. Note that the Ethernet PHY is powered up by default. The PHY cannot be powered down unless a clock source is provided
and the MDIO pin is pulled up through a 10-kΏ resistor.
Table 22-13 on page 1028 shows how to handle signals for functions that are not used in a particular
system implementation for devices that are in a 108-ball BGA package. Two options are shown in
the table: an acceptable practice and a preferred practice for reduced power consumption and
improved EMC characteristics. If a module is not used in a system, and its inputs are grounded, it
is important that the clock to the module is never enabled by setting the corresponding bit in the
RCGCx register.
Table 22-13. Connections for Unused Signals (108-Ball BGA)
Function
Ethernet
GPIO
Signal Name
ERBIAS
RXIN
RXIP
TXON
TXOP
XTALNPHY^a
XTALPPHY^a
All unused GPIOs
Pin Number
J3
L7
M7
L8
M8
J1
J2
-
Acceptable Practice
Connect to GND through
12.4-kΩ resistor.
NC
NC
NC
NC
NC
NC
NC
Preferred Practice
Connect to GND through
12.4-kΩ resistor.
GND
GND
GND
GND
NC
GND
GND
1028
Texas Instruments-Production Data
July 24, 2012