Datasheet

9
LTC1040
1040fa
TYPICAL APPLICATIO S
U
Complete Heating/Cooling Automatic Thermostat
5k
TEMP
ADJUST
6.81k
4.32k 4.99k
82k*
20M
82k*
SEPARATION
(20mV)
LTC1040 • TA03
–
–
+
+
COMP B
LTC1040
–
–
+
+
COMP A
5
17 18
4
3
15
16
10
0.1µF
10M
COOL
HEAT
9
6
7
8
14
13
12
11
20M
THERMISTOR # 44007
YELLOW SPRINGS INSTRUMENT CO., INC.
HYSTERESIS = 5V • = 20mV
5V AT 0.85µA
†
†
*
82k
20M
28°C
27°C
HEAT
COOL
TIME
LTC1040 • TA04
HEATER ON
TEMPERATURE
HEATER OFF
AIRCONDITIONING OFF
AIRCONDITIONING ON
HYSTERESIS
HYSTERESIS
SEPARATION
Window Comparator with Independent Window Limits and
Fully Floating Differential Input
Hysteresis Comparator with Fully Floating Differential Input
A
OUT
= “1” WHEN
V
IN
> V
U
B
OUT
= “1” WHEN
V
IN
< V
L
A+B = “1” WHEN
V
U
≥ V
IN
≥ V
L
LTC1040 • TA05
–
–
+
+
–
–
+
+
COMP A
COMP B
LTC1040
V
L
V
IN
V
U
V
IN
OUT = “0” WHEN V
IN
> V
U
= = 0.996 V
TRIP
+ 20mV
V
TRIP
LTC1040 • TA06
V
+
R2
2.49MΩ
R1
10k
OUT
–
–
+
+
1/2 LTC1040
*
*
V
TRIP
R2 + (5V) R1
R1 + R2
OUT = “1” WHEN V
IN
< V1 =
TO CENTER HYSTERESIS ABOUT V
TRIP
,
FORCE THIS INPUT TO
HYSTERESIS/2 (10mV)
= 0.996V
TRIP
V
TRIP
R2
R1 + R2