LM3S5749 Datasheet, PDF (868/947 Pages) Texas Instruments – Stellaris® LM3S5749 Microcontroller

Signal Tables
Table 22-3. 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 (ADC,
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. When the on-chip LDO is
used to provide power to the logic, 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 (3.3 V) for the analog circuits
(ADC, 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 connected to 3.3 V,
regardless of system implementation.
IDX0
40
I
TTL
QEI module 0 index.
QEI
PhA0
43
I
TTL
QEI module 0 phase A.
PhB0
42
I
TTL
QEI module 0 phase B.
SSI0Clk
28
I/O
TTL
SSI module 0 clock.
SSI0Fss
29
I/O
TTL
SSI module 0 frame.
SSI0Rx
30
I
TTL
SSI module 0 receive.
SSI0Tx
31
O
TTL
SSI module 0 transmit.
SSI
SSI1Clk
74
I/O
TTL
SSI module 1 clock.
SSI1Fss
75
I/O
TTL
SSI module 1 frame.
SSI1Rx
95
I
TTL
SSI module 1 receive.
SSI1Tx
96
O
TTL
SSI module 1 transmit.
868
November 17, 2011
Texas Instruments-Production Data