LTC1392 Datasheet, PDF (12/12 Pages) Linear Technology – Micropower Temperature, Power Supply and Differential Voltage Monitor

LTC1392
TYPICAL APPLICATI
Measuring a Secondary Temperature with an External Thermistor
5V
R1*
6.8k
LT1004-1.2
ERT-D2FHL103S DIVIDER OUTPUT VOLTAGE
VS TEMPERATURE
1.5
1.4
1.3
1.2
IDEAL OUTPUT (V) =
1.1
–11.15mV/°C • TEMPERATURE + 1.371
1.0
0.9 ^ACTUAL
0.8 ^DIVIDER
0.7 ^OUTPUT
0.6
0.5
0.4
0.3
0.2
0.1
0
20 30 40 50 60 70 80
TEMPERATURE (°C)
5V
LTC1392
8
V_CC
1
D_IN
R2*
1.8k
IDEAL OUTPUT (V) =
–11.15mV/°C • TEMPERATURE + 1.371
TEMPERATURE RANGE: 38°C TO 80°C ±4°C
7
–V_IN
6
+V_IN
5
GND
2
D_OUT
3
CLK
4
CS
R_T = ERT – D2FHL103S
ASSUMING 3% β AND
10% R_TO TOLERANCES
* 1% FILM RESISTOR
P1.4
MPU
(e.g., 8051)
P1.3
P1.2
1392 TA05
RELATED PARTS
PART NUMBER DESCRIPTION
LT1025
Micropower Thermocouple Cold Junction Compensator
LTC1285/LTC1288 3V Micropower 12-Bit ADCs with Auto Shutdown
LTC1286/LTC1298 Micropower 12-Bit ADCs with Auto Shutdown
LTC1391
Low Power, Precision 8-to-1 Analog Multiplexer
LM334
Constant Current Source and Temperature Sensor
COMMENT
Compatible with Standard Thermocouples (E, J, K, R, S, T)
Differential or 2-Channel Multiplexed, Single Supply
Differential or 2-Channel Multiplexed, Single Supply
SPI, QSPI Compatible, Single 5V or 3V, Low R_ON, Low Charge Injection
3 Pins, Current Out Pin
12 Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417^q [phone]
FAX: [phone]^qTELEX: 499-3977^q www.linear-tech.com
1392f LT/TP 0497 7K • PRINTED IN USA
© LINEAR TECHNOLOGY CORPORATION 1995