LTC1040_09 datasheet(9/12 Pages) LINER

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LTC1040

1040fa

TYPICAL APPLICATIO S

Complete Heating/Cooling Automatic Thermostat

TEMP

ADJUST

6.81k

4.32k

4.99k

82k*

20M

82k*

SEPARATION

(20mV)

LTC1040 • TA03

–

COMP B

LTC1040

–

COMP A

0.1

µF

10M

COOL

HEAT

20M

THERMISTOR # 44007

YELLOW SPRINGS INSTRUMENT CO., INC.

HYSTERESIS = 5V •

= 20mV

5V AT 0.85

µA

†

82k

20M

°C

HEAT

COOL

TIME

LTC1040 • TA04

HEATER ON

HEATER OFF

AIRCONDITIONING OFF

AIRCONDITIONING ON

HYSTERESIS

SEPARATION

Window Comparator with Independent Window Limits and

Fully Floating Differential Input

Hysteresis Comparator with Fully Floating Differential Input

AOUT = “1” WHEN

VIN > VU

BOUT = “1” WHEN

VIN < VL

A+B = “1” WHEN

VU ≥ VIN ≥ VL

LTC1040 • TA05

–

COMP A

COMP B

LTC1040

VIN

OUT = “0” WHEN VIN > VU =

= 0.996 VTRIP + 20mV

VTRIP

LTC1040 • TA06

V+

2.49M

Ω

10k

OUT

–

1/2 LTC1040

VTRIP R2 + (5V) R1

R1 + R2

OUT = “1” WHEN VIN < V1 =

TO CENTER HYSTERESIS ABOUT VTRIP, FORCE THIS INPUT TO

HYSTERESIS/2 (10mV)

= 0.996VTRIP

VTRIP R2

R1 + R2

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