LM3S2939 Datasheet, PDF (675/749 Pages) Texas Instruments – Stellaris® LM3S2939 Microcontroller

Stellaris^® LM3S2939 Microcontroller
Table 20-2. Signals by Signal Name (continued)
Pin Name
Pin Number Pin Type Buffer Type^a Description
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, including the
38
processor core and most peripherals.
62
88
VDDA
3
-
Power The positive supply for the analog circuits (ADC, Analog
98
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 696, regardless of system
implementation.
WAKE
50
I
TTL
An external input that brings the processor out of Hibernate
mode when asserted.
XOSC0
52
I
Analog Hibernation module oscillator crystal input or an external clock
reference input. Note that this is either a crystal or a
32.768-kHz oscillator for the Hibernation module RTC.
XOSC1
53
O
Analog Hibernation module oscillator crystal output. Leave
unconnected when using a single-ended clock source.
a. The TTL designation indicates the pin has TTL-compatible voltage levels.
20.1.3 Signals by Function, Except for GPIO
Table 20-3. Signals by Function, Except for GPIO
Function
Pin Name
ADC0
ADC
ADC1
ADC2
C0+
C0-
C0o
C1+
Analog Comparators
C1-
C1o
C2+
C2-
Controller Area
Network
CAN0Rx
CAN0Tx
Pin Number
1
2
5
90
92
58
24
91
46
23
22
10
11
Pin Type
I
I
I
I
I
O
I
I
O
I
I
I
O
Buffer Type^a
Description
Analog Analog-to-digital converter input 0.
Analog Analog-to-digital converter input 1.
Analog Analog-to-digital converter input 2.
Analog Analog comparator 0 positive input.
Analog Analog comparator 0 negative input.
TTL
Analog comparator 0 output.
Analog Analog comparator 1 positive input.
Analog Analog comparator 1 negative input.
TTL
Analog comparator 1 output.
Analog Analog comparator 2 positive input.
Analog Analog comparator 2 negative input.
TTL
CAN module 0 receive.
TTL
CAN module 0 transmit.
June 18, 2012
675
Texas Instruments-Production Data