LM3S5G31 Datasheet, PDF (1143/1223 Pages) Texas Instruments – Stellaris LM3S5G31 Microcontroller

Stellaris^® LM3S5G31 Microcontroller
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 23-12. Connections for Unused Signals (100-Pin LQFP)
Function
GPIO
Hibernate
No Connects
System
Control
USB
Signal Name
All unused GPIOs
HIB
VBAT
WAKE
XOSC0
XOSC1
NC
OSC0
OSC1
RST
USB0DM
USB0DP
USB0RBIAS
Pin Number
-
51
55
50
52
53
-
48
49
64
70
71
73
Acceptable Practice
NC
NC
NC
NC
NC
NC
NC
NC
NC
Pull up as shown in Figure
5-1 on page 187
NC
NC
Connect to GND through
10-kΩ resistor.
Preferred Practice
GND
NC
GND
GND
GND
NC
NC
GND
NC
Connect through a capacitor to
GND as close to pin as possible
GND
GND
Connect to GND through 10-kΩ
resistor.
Table 23-13 on page 1143 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 187
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
July 03, 2014
Texas Instruments-Production Data
1143