Datasheet

TC620/TC621
DS21439D-page 2  2001-2012 Microchip Technology Inc.
Functional Block Diagrams
3
HIGH SET
2
LOW SET
5
CONTROL*
6
HIGH LIMIT
V
DD
7
LOW LIMIT
8
4
*Suffix code "C" denotes cooling option (High true CONTROL output).
Suffix code "H" denotes heating option (Low true CONTROL output).
Q
S
R
Q
+
+
–
–
TC620
HIGH SET
LOW SET
1
THERMISTOR
CONTROL*
HIGH LIMIT
LOW LIMIT
Temp. to
Voltage
Converter
V
REF
GEN
V
REF
GEN
V
REF
3
2
5
6
V
DD
7
8
4
Q
S
R
Q
+
+
–
–
TC621
Thermistor
Interface
Circuit
V
REF
GEN
V
REF
GEN
V
REF