LM3S2637 Datasheet, PDF (589/678 Pages) Texas Instruments – Stellaris® LM3S2637 Microcontroller

Stellaris^® LM3S2637 Microcontroller
Table 16-1. Analog Comparators Signals (100LQFP) (continued)
Pin Name
Pin Number Pin Type Buffer Type^a Description
C2+
23
I
Analog Analog comparator 2 positive input.
C2-
22
I
Analog Analog comparator 2 negative input.
a. The TTL designation indicates the pin has TTL-compatible voltage levels.
Table 16-2. Analog Comparators Signals (108BGA)
Pin Name
Pin Number Pin Type Buffer Type^a Description
C0+
A7
I
Analog Analog comparator 0 positive input.
C0-
A6
I
Analog Analog comparator 0 negative input.
C0o
F1
O
TTL
Analog comparator 0 output.
C1+
M1
I
Analog Analog comparator 1 positive input.
C1-
B7
I
Analog Analog comparator 1 negative input.
C1o
L8
O
TTL
Analog comparator 1 output.
C2+
M2
I
Analog Analog comparator 2 positive input.
C2-
L2
I
Analog Analog comparator 2 negative input.
a. The TTL designation indicates the pin has TTL-compatible voltage levels.
16.3 Functional Description
Important: It is recommended that the Digital-Input enable (the GPIODEN bit in the GPIO module)
for the analog input pin be disabled to prevent excessive current draw from the I/O
pads.
The comparator compares the VIN- and VIN+ inputs to produce an output, VOUT.
VIN- < VIN+, VOUT = 1
VIN- > VIN+, VOUT = 0
As shown in Figure 16-2 on page 589, the input source for VIN- is an external input. In addition to
an external input, input sources for VIN+ can be the +ve input of comparator 0 or an internal reference.
Figure 16-2. Structure of Comparator Unit
- ve input
+ ve input ⁰
1
+ ve input (alternate)
2
reference input
CINV
output
IntGen
TrigGen
ACCTL
ACSTAT
June 18, 2012
589
Texas Instruments-Production Data