LM3S5G51 Datasheet, PDF (1184/1266 Pages) Texas Instruments – Stellaris® LM3S5G51 Microcontroller

Signal Tables
Table 23-13 on page 1184 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 23-13. Connections for Unused Signals (108-Ball BGA)
Function
GPIO
Hibernate
No Connects
System
Control
Signal Name
All unused GPIOs
HIB
VBAT
WAKE
XOSC0
XOSC1
NC
OSC0
OSC1
RST
USB
USB0RBIAS
USB0DM
USB0DP
Pin Number
-
M12
L12
M10
K11
K12
-
L11
M11
H11
B12
C11
C12
Acceptable Practice
Preferred Practice
NC
GND
NC
NC
NC
GND
NC
GND
NC
GND
NC
NC
NC
NC
NC
GND
NC
NC
Pull up as shown in Figure Connect through a capacitor to
5-1 on page 188
GND as close to pin as possible
Connect to GND through Connect to GND through 10-kΩ
10-kΩ resistor.
resistor.
NC
GND
NC
GND
1184
Texas Instruments-Production Data
January 23, 2012