LM3S310 Luminary Micro, Inc, LM3S310 Datasheet - Page 266

• Manufacturer Part Number: LM3S310
• Description: Lm3s310 Arm Microcontroller
• Manufacturer: Luminary Micro, Inc

Analog Comparators
13
13.1
266
1.Not all comparators have the option to drive an output pin. See Table 13-1, Table 13-2 and Table 13-3
for more information.
Analog Comparators
An analog comparator is a peripheral that compares two analog voltages, and provides a logical
output that signals the comparison result.
The LM3S310 controller provides three independent integrated analog comparators that can be
configured to drive an output
A comparator can compare a test voltage against any one of these voltages:
The comparator can provide its output to a device pin, acting as a replacement for an analog
comparator on the board, or it can be used to signal the application via interrupts to cause it to
start capturing a sample sequence. The interrupt generation logic is separate.
Block Diagram
Figure 13-1. Analog Comparator Module Block Diagram
An individual external reference voltage
A shared single external reference voltage
A shared internal reference voltage
internal
C2+
C0+
C2-
C1-
C1+
C0-
bus
1
or generate an interrupt.
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
output
output
output
C2o
interrupt
C1o
interrupt
C0o
interrupt
July 5, 2006