Industrial System Health Monitoring & Temperature Sensing

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National provides many solutions for temperature measurement and system monitoring including:

Block Diagrams

System Health Monitoring Temperature Sensing
Also see Thermal Management Homepage for system monitor and temp sensor ICs.

 

System Health Monitors

DC-DC Converter Analog Temp Sensor System Health Monitor IC

 

Integrated System Health Monitor ICs

Feature LM96080 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

 

Analog Temperature Sensing

Temp Sensor Temperature
Accuracy		 Temperature
Range		 ADC Starting Accuracy
(ADC Accuracy)
±1.5 to ±2.7°C -55 to +150ºC ADC101SXX1 ±0.10%
      ±0.10%
      ADC121SXX1 ±0.024%
      ±0.024%
 

 
 

Temperature Switch
Temp Switch Setpoint
Type		 Temperature
Accuracy		 Setpoint
Range		 Voltage
Range
Factory ±2.2ºC 0ºC to +150ºC,
1ºC increments		 1.6V to 5.5V
Factory ±3ºC -55ºC to +125ºC,
1ºC increments		 2.7V to 5.5V
Factory ±3ºC 120ºC to 150ºC,
1ºC increments		 2.7V to 5.5V
User Program ±2ºC -40ºC to +125ºC,
ext resistor set		 2.7V to 10V
  Temperature Switch 

 
 

Remote Diode Temperature Sensing
Temp Switch Temperature
Accuracy		 Temperature
Range		 Configuration
±1.1ºC -40 to +140ºC 1 local sensor,
4 remote
  Thermal Management 

 
 

Thermocouples

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
(ADC Accuracy)		 Temp Sensor Cold Junction
Accuracy
±0.024% 1.5 to 2.7ºC
±0.006%    
±0.024%    
  LM4140 ADC - Low Power ADC - Low Power LM94022 LMP7701 

 
 

Resistance Temperature Detectors (RTDs)

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
(ADC Accuracy)
ADC121SXX5 ±0.024%
±0.006%
  LM4132 LMP7704 LMP7704 LMP7704 LMP7704 ADC - Low Power LM4040 

 
 

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

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