LM3S1138 Luminary Micro, Inc, LM3S1138 Datasheet - Page 412
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LM3S1138
Manufacturer Part Number
LM3S1138
Description
Lm3s1138 Arm Microcontroller
Manufacturer
Luminary Micro, Inc
Datasheet
1.LM3S1138.pdf
(491 pages)
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Analog Comparators
16.1
16.2
412
Block Diagram
Figure 16-1. Analog Comparator Module Block Diagram
Functional Description
Important:
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 413, 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.
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.
internal
C2+
C0+
C2-
C1-
C1+
C0-
bus
ACREFCTL
Voltage
Ref
Preliminary
-ve input
+ve input
+ve input (alternate)
reference input
-ve input
+ve input
+ve input (alternate)
reference input
-ve input
+ve input
+ve input (alternate)
reference input
ACSTAT2
ACSTAT1
ACSTAT0
ACCTL2
ACCTL1
ACCTL0
Comparator 2
Comparator 1
Comparator 0
interrupt
interrupt
interrupt
trigger
output
output
output
trigger
trigger
C2o
trigger
C1o
C0o
Interrupt Control
trigger
trigger
ACINTEN
interrupt
ACRIS
ACMIS
July 26, 2008
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