Texas Instruments MSP430x1xx - Manual (Page 268)

Comparator_A Overview
14-2
14.1 Comparator_A Overview
The primary function of the comparator module is to support precision A/D
slope-conversion applications, battery-voltage supervision, and monitoring of
external analog signals. The comparator is controlled via twelve control bits
in registers CACTL1 and CACTL2.
Figure 14–1. Schematic of Comparator_A
CA0
P2CA0
CA1
0
1
0
1
P2CA1
0
1
0
1
_
+
CAON
0
1
CAEX
0
1
CAF
Low Pass Filter
τ ≈ 2.0 µ s
CAOUT to
Internal Module
Set CAIFG
Flag
CAOUT to
External Pin
0
CARSEL
1
0
2
1
3
VCAREF
0 1 2 3
CAREF
0.5 x VCC
0.25 x VCC
CA1
CA0
0 V
0 V
0 V 0 V
VCC
1
0 V
0
CAON
VCC
1
0 V
0
The input and output pins of Comparator_A are often multiplexed with other
pin functions on the MSP430. Additionally, the internal connections to
Comparator_A can differ among MSP430 devices. The data sheet of a desired
device should always be consulted to determine the specific connection
implementations.