10

LTC1392

System Monitor for Two Supply Voltages and Ambient Temperature

System Monitor for Relative Humidity, Supply Voltage and Ambient Temperature

1

2

3

4

8

7

6

5

GND

P1.4

P1.3

P1.2

CLK

CS

LTC1392

5V

OUTPUT

0V TO 1V =

0% TO 100%

0.1

µF

0.1

µF

6

1

2

3

9k*

1k*

8

100pF

MPU

(e.g., 8051)

22M

SENSOR

SENSOR: PANAMETRICS #RHS

500pF AT RH = 76%

1.7pF/%RH

–

+

LM301A

10k

5V

5V

5V

–5V

–5V

–5V

10k

5%

RH TRIM

0.1

µF

0.1

µF

1392 TA04

1

µF

6

2

3

7

4

–

+

LT

0.1

µF

100pF

0.1

µF

0.01

µF

1/4 LTC1043

1/4 LTC1043

1

µF

–5V

1k

1%

LT1004-1.2

500

Ω

90%

RH TRIM

470

Ω

33k

13

12

14

11

17

16

7

8

0.1

µF

* 1% FILM RESISTOR

1

2

3

4

8

7

6

5

GND

P1.4

P1.3

P1.2

CLK

CS

LTC1392

3.3V

G1

M2

0.1

µF

2.5

µH

15A

0.1

µF

LTC1392 • TA03

10

µF

0.1

µF

1N4148

M3

M1, M2, M3:

MOTOROLA MTD20N03HL

M1

5V

G2

SHDN

SHDN

7.5k

4700pF

FB

COMP

GND

10k

TRIMMED TO

10k

12k

100pF

LTC1430

MPU

(e.g., 8051)

+

C1

220pF

100k

33k

22

Ω

0.1

µF

10

µF

16V

220

µF

10V

×4

330

µF

6.3V

×6

+

+

+