National provides many solutions for temperature measurement and system monitoring including:
Integrated System Health Monitor ICs
Feature
LM80 LM87 LM96194 LM94 LM96163
Description 7 Ch + local temp
8 ch + local and remote temp
9 ch + local and 4 remote temp
16 ch + local and 4 remote temp
Remote + local temp with fan control
Voltage Monitor 7
8
9
16
n/a
Temp Monitor Local
2 remote + local
4 remote + local
4 remote + local
Remote + Local
Fan Tach Monitor 2
2
4
4
1
Fan Control -
Register programmable
LUT and PI Closed Loop for 4-pin FANs
LUT and PI Closed Loop for 4-pin FANs
Lookup Table
DAC/PWM -
1 DAC
2 PWMs
2 PWMs
1 PWM
Supply 2.8V to 3.8V or 4.25V to 5.75V
2.8 to 3.8V
3.0 to 3.6V
3.0 to 3.6V
3.0 to 3.6V
Operating Temperature Range -25°C to 125°C
-40°C to 125°C
-40°C to 85°C
0°C to 85°C
25°C to 125°C
Package TSSOP-24
TSSOP-24
LLP-48 7x7 mm2
TSSOP-56
LLP-10 3x3 mm2
Voltage Monitoring Only Using ADCs
Feature
ADC122S101 ADC124S101 ADC128S102
Description 2-channel ADC
4-channel ADC
8-channel ADC
Pin Compatible Alternatives Other sample rang e ranges and resolutions
Other sample rang e ranges and resolutions
Other sample rang e ranges and resolutions
Interface SPI
SPI
SPI
Sample rate 500 kSPS to 1 MSPS
500 kSPS to 1 MSPS
500 kSPS to 1 MSPS
Signal Accuracy (max) ±0.024%
±0.024%
±0.024%
Guaranteed Performance over Sample Rate
Supply 2.7 to 5.25V
2.7 to 5.25V
2.7 to 5.25V
Power down
Operating Temperature Range -40 to +85°C
-40 to +85°C
-40 to +105°C
Package MSOP-8
MSOP-10
TSSOP-16
Temp Sensor
Temperature
Temperature
ADC
Starting Accuracy
±1.5 to ±2.7°C
-55 to +150ºC
ADC101SXX1
±0.10%
±0.10%
ADC121SXX1
±0.024%
±0.024%
Temp Switch
Setpoint
Temperature
Setpoint
Voltage
Factory
±2.2ºC
0ºC to +150ºC,
1.6V to 5.5V
Factory
±3ºC
-55ºC to +125ºC,
2.7V to 5.5V
Factory
±3ºC
120ºC to 150ºC,
2.7V to 5.5V
User Program
±2ºC
-40ºC to +125ºC,
2.7V to 10V
Temp Switch
Temperature
Temperature
Configuration
±1.1ºC
-40 to +140ºC
1 local sensor,
Thermocouples use two dissimilar metals. A temperature gradient along the length of the thermocouple generates a voltage output. Thermocouples are available in a variety of metal combinations to target specific temperature ranges. Thermocouples are available over a very wide range of temperatures and are rugged and very reliable.
OpAmp
ADC
Starting Accuracy
Temp Sensor
Cold Junction
with
±0.024%
1.5 to 2.7ºC
±0.006%
±0.024%
Resistance Temperature Detectors (RTDs) are wire wound and thin film devices that measure temperature based in the temperature coefficient of electrical resistance of metals. The have an increasing resistance has they become hotter. They are very accurate and have response times of a fraction of a second.
Opamp
ADC
Starting Accuracy
with
ADC121SXX5
±0.024%
±0.006%
Typical Temperature Sensor Applications
Industrial Applications
HVAC controllers
Gas monitors
Industrial controllers
I/O modules
Process controllers
Discrete volumetric valves
Wireless fire alarms
System monitoring
Medical Applications
Patient-monitoring systems
Consumer
LCD TV - screen brightness
PC Related
System monitoring
Remote-diode monitoring
Fan control
Sensing & Detection Solutions
I2C-Compatible, 12/10/8-Bit Analog-to-Digital Converter with Alert Pin
60V Common Mode, 50/100 x Gain, Bidirectional Precision Current Sensing Amplifier
Resistor-Programmable Temperature Switch and Analog Temperature Sensor
Nanopower, 1.8V, RRIO, CMOS Input, Operational Amplifier
16-Bit, 50 to 250 kSPS, Differential Input, MicroPower ADC
LM(2)557x SIMPLE SWITCHER® Buck Regulator Series Input Voltage Range Up to 75VLow power ADC , low power DAC , amplifiers , and temperature sensors featured sites.
