LM3S1601 Datasheet, PDF (523/587 Pages) Texas Instruments – ARM and Thumb are registered trademarks and Cortex is a trademark

Stellaris^® LM3S1601 Microcontroller
Table 16-3. Signals by Function, Except for GPIO (continued)
Function
Pin Name Pin Number Pin Type Buffer Type^a
Description
GND
9
-
Power Ground reference for logic and I/O pins.
15
21
33
39
45
54
57
63
69
82
87
94
GNDA
4
-
Power The ground reference for the analog circuits (
97
Analog Comparators, etc.). These are separated
from GND to minimize the electrical noise contained
on VDD from affecting the analog functions.
LDO
Power
7
-
Power Low drop-out regulator output voltage. This pin
requires an external capacitor between the pin and
GND of 1 µF or greater. The LDO pin must also be
connected to the VDD25 pins at the board level in
addition to the decoupling capacitor(s).
VDD
8
-
Power Positive supply for I/O and some logic.
20
32
44
56
68
81
93
VDD25
14
-
Power Positive supply for most of the logic function,
38
including the processor core and most peripherals.
62
88
VDDA
3
-
Power The positive supply for the analog circuits (ADC,
98
Analog Comparators, etc.). These are separated
from VDD to minimize the electrical noise contained
on VDD from affecting the analog functions. VDDA
pins must be supplied with a voltage that meets the
specification in “Recommended DC Operating
Conditions” on page 541, regardless of system
implementation.
SSI0Clk
28
I/O
TTL
SSI module 0 clock
SSI0Fss
29
I/O
TTL
SSI module 0 frame signal
SSI0Rx
30
I
TTL
SSI module 0 receive
SSI0Tx
31
O
TTL
SSI module 0 transmit
SSI
SSI1Clk
72
I/O
TTL
SSI module 1 clock
SSI1Fss
73
I/O
TTL
SSI module 1 frame signal
SSI1Rx
74
I
TTL
SSI module 1 receive
SSI1Tx
75
O
TTL
SSI module 1 transmit
June 19, 2012
523
Texas Instruments-Production Data