Specifications

129
3706C–MICRO–2/11
AT89LP3240/6440
Figure 19-4. Dual Comparator Configuration Examples
a. dual independent comparators with external references
+
-
A
CMPA
AIN0
AIN1
+
-
B
CMPB
AIN3
AIN2
CSA = 00 RFA = 00 CSB = 11 RFB = 00
b. 3-channel comparator with external reference
+
-
A
CMPA
AIN0
AIN1
CSA = 00/10/11 RFA = 00
AIN2
AIN3
c. 4-channel comparator with internal reference
+
-
A
CMPA
AIN0
V
AREF
CSA = 00/01/10/11 RFA = 10
AIN1
AIN2
AIN3
d. 2-channel comparator with internal reference &
comparator with external reference
+
-
A
CMPA
AIN0
V
AREF
CSA = 00/01 RFA = 10
AIN1
+
-
B
CMPB
AIN3
AIN2
CSB = 11 RFB = 00
e. 2-channel comparator with external reference &
comparator with internal reference
+
-
A
CMPA
AIN0
V
AREF
CSA = 00/10 RFA = 00
AIN1
+
-
B
CMPB
AIN2
AIN3
CSB = 11 RFB = 10
+
-
B
CMPB
+
-
A
CMPA
AIN1
AIN2
AIN0
AIN3
CSA = CSB = 00/11
RFA = RFB = 00
f. 2-channel window
comparator with
external reference
+
-
B
CMPB
+
-
A
CMPA
AIN3
AIN0
AIN1
AIN2
CSA = CSB = 00/01/10/11
RFA = 01 RFB = 11
g. 4-channel window
comparator with
internal reference
V
AREF+Δ
V
AREF-Δ