9

LTC1040

1040fa

TYPICAL APPLICATIO S

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

0.1

µF

10M

COOL

HEAT

9

6

7

8

14

13

12

11

20M

THERMISTOR # 44007

YELLOW SPRINGS INSTRUMENT CO., INC.

HYSTERESIS = 5V •

= 20mV

5V AT 0.85

µA

†

†

*

82k

20M

28

°C

27

°C

HEAT

COOL

TIME

LTC1040 • TA04

HEATER ON

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+B = “1” WHEN

LTC1040 • TA05

–

–

+

+

–

–

+

+

COMP A

COMP B

LTC1040

LTC1040 • TA06

R2

2.49M

Ω

R1

10k

OUT

–

–

+

+

1/2 LTC1040

*

*

R1 + R2

HYSTERESIS/2 (10mV)

R1 + R2