LM3S5D91 Datasheet, PDF (1235/1340 Pages) Texas Instruments – Stellaris® LM3S5D91 Microcontroller

Stellaris^® LM3S5D91 Microcontroller
Table 23-8. Signals by Signal Name (continued)
Pin Name
Pin Number Pin Mux / Pin Pin Type Buffer Type^a Description
Assignment
USB0ID
E12
PB0
I
Analog This signal senses the state of the USB ID signal.
The USB PHY enables an integrated pull-up, and
an external element (USB connector) indicates the
initial state of the USB controller (pulled down is
the A side of the cable and pulled up is the B side).
USB0PFLT
L2
PC7 (6)
I
M2
PC6 (7)
M6
PA7 (8)
E11
PB3 (8)
B11
PE0 (9)
B10
PH4 (4)
B6
PJ1 (9)
TTL
Optionally used in Host mode by an external power
source to indicate an error state by that power
source.
USB0RBIAS
B12
fixed
O
Analog 9.1-kΩ resistor (1% precision) used internally for
USB analog circuitry.
USB0VBUS
D12
PB1
I/O
Analog This signal is used during the session request
protocol. This signal allows the USB PHY to both
sense the voltage level of VBUS, and pull up VBUS
momentarily during VBUS pulsing.
VDD
K7
fixed
-
Power Positive supply for I/O and some logic.
G12
K8
K9
H10
G10
E10
G11
VDDA
C7
fixed
-
Power The positive supply 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 supplied with a voltage that meets the
specification in Table 25-2 on page 1254, regardless
of system implementation.
VDDC
D3
fixed
C3
-
Power Positive supply for most of the logic function,
including the processor core and most peripherals.
The voltage on this pin is 1.3 V and is supplied by
the on-chip LDO. The VDDC pins should only be
connected to the LDO pin and an external capacitor
as specified in Table 25-6 on page 1259.
VREFA
A7
PB6
I
Analog This input provides a reference voltage used to
specify the input voltage at which the ADC converts
to a maximum value. In other words, the voltage
that is applied to VREFA is the voltage with which
an AINn signal is converted to 4095. The VREFA
input is limited to the range specified in Table
25-23 on page 1270 .
a. The TTL designation indicates the pin has TTL-compatible voltage levels.
January 22, 2012
Texas Instruments-Production Data
1235