Datasheet

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

V
CC

–V
IN

+V
IN

GND
P1.4

P1.3
P1.2
D
IN

D
OUT

CLK
CS
LTC1392
5V
OUTPUT
0V TO 1V =
0% TO 100%
0.1µF
0.1µF
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
0.1µF
0.1µF
1392 TA04
1µF
6
2
3
7
4
–
+
LT
®
1056
0.1µF
100pF
0.1µF
0.01µF
1/4 LTC1043
1/4 LTC1043
1µF
–5V
1k
1%
LT1004-1.2
500Ω
90%
RH TRIM
470Ω
33k
13
12
14
11
17
16
7
8
0.1µF
* 1% FILM RESISTOR
TYPICAL APPLICATIONS
U
1
2
3
4
8
7
6
5

V
CC

–V
IN

+V
IN

GND
P1.4

P1.3
P1.2
D
IN

D
OUT

CLK
CS
LTC1392
V
OUT

3.3V
V
CC
–V
IN
+V
IN
PV
CC
G1
M2
0.1µF
2.5µH
15A
0.1µF
LTC1392 • TA03
10µF
0.1µF
1N4148
M3
M1, M2, M3: 
MOTOROLA MTD20N03HL
M1
5V
G2
SHDN SHDN
R
C

7.5k
C
C

4700pF
FB
COMP
GND
10k
TRIMMED TO 
V
OUT
= 3.3V
10k
12k
100pF
LTC1430
MPU
(e.g., 8051)
+
C1
220pF
100k
33k
22Ω
0.1µF
10µF
16V
220µF 
10V
×4
C
O

330µF 
6.3V
×6
+
+
+