MAX31851
Cold-Junction Compensated, 1-Wire Thermocouple-to-Digital Converters
Accurate 1-Wire Thermocouple-to-Digital Converter ICs Ease Design Effort and Lower System Cost
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The MAX31850/MAX31851 cold-junction compensated, 1-Wire® thermocouple-to-digital converters perform cold-junction compensation and digitize the signal from a K-, J-, N-, T-, S-, R-, or E-type thermocouple. The converters resolve temperatures to 0.25°C, allow readings as high as +1768°C and as low as -270°C, and exhibit thermocouple accuracy of 8 LSBs (2°C) for temperatures ranging from -200°C to +700°C.
Communication with the master microcontroller is over a 1-Wire bus that by definition requires only one data line (and ground) for communication. Operating power can be obtained directly from the data line (“parasite power”), eliminating the need for an external power supply.
Each device has a unique 64-bit serial code, which allows multiple units to function on the same 1-Wire bus. Therefore, it is simple to use one microcontroller (the master device) to monitor temperature from many thermocouples distributed over a large area.
Four location address inputs simplify mapping of individual units to specific locations.
Key Features
- Integration Reduces Design Time and Lowers System Cost
- 14-Bit, 0.25°C Resolution
- Integrated Cold-Junction Compensation
- Available for Multiple Thermocouples Types: Supports K-, J-, N-, T-, and E-Type (MAX31850); S- and R-Type (MAX31851)
- Detects Thermocouple Shorts to GND or VDD
- Detects Open Thermocouple
- 1-Wire Multiddrop Capability Simplifies Multisensor Systems
- 1-Wire Interface (Read-Only); Power Can Be Obtained from Interface (Parasite-Powered Mode)
Applications/Uses
- Appliances
- HVAC
- Industrial
- Medical
| Sensor Type | Remote |
| # Channels | One |
| Interface | 1-Wire |
| Functions | Thermocouple-to-Digital Converter |
| Accuracy (±°C) | 2 |
| Parasite Pwr. | Yes |
| Temp. Resolution (bits) | 14 |
| Oper. Temp. (°C) | -40 to +125 |
| Package/Pins | TDFN/10 |
| Budgetary Price (See Notes) | $3.26 @1k |
Technical Docs
| Data Sheet | Cold-Junction Compensated, 1-Wire Thermocouple-to-Digital Converters | Jan 09, 2015 |
Click any title below to view the detail page where available.
Description
Features
- Includes Everything Needed to Evaluate a MAX31850K with a K-Type Thermocouple
- EV Kit Hardware is USB Powered (USB Cable Included)
- Windows XP®- and Windows® 7-Compatible Operating System Software
- USB HID Interface
- Second Channel Allows Easy Evaluation of Other Thermocouple Types
- Fully Assembled and Tested on Proven PCB Layout
- RoHS Compliant
Support & Training
Search our knowledge base for answers to your technical questions.
Filtered SearchOur dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal.
Parameters
| Sensor Type | Remote |
| # Channels | One |
| Interface | 1-Wire |
| Functions | Thermocouple-to-Digital Converter |
| Accuracy (±°C) | 2 |
| Parasite Pwr. | Yes |
| Temp. Resolution (bits) | 14 |
| Oper. Temp. (°C) | -40 to +125 |
| Package/Pins | TDFN/10 |
| Budgetary Price (See Notes) | $3.26 @1k |
Key Features
- Integration Reduces Design Time and Lowers System Cost
- 14-Bit, 0.25°C Resolution
- Integrated Cold-Junction Compensation
- Available for Multiple Thermocouples Types: Supports K-, J-, N-, T-, and E-Type (MAX31850); S- and R-Type (MAX31851)
- Detects Thermocouple Shorts to GND or VDD
- Detects Open Thermocouple
- 1-Wire Multiddrop Capability Simplifies Multisensor Systems
- 1-Wire Interface (Read-Only); Power Can Be Obtained from Interface (Parasite-Powered Mode)
Applications/Uses
- Appliances
- HVAC
- Industrial
- Medical
Description
The MAX31850/MAX31851 cold-junction compensated, 1-Wire® thermocouple-to-digital converters perform cold-junction compensation and digitize the signal from a K-, J-, N-, T-, S-, R-, or E-type thermocouple. The converters resolve temperatures to 0.25°C, allow readings as high as +1768°C and as low as -270°C, and exhibit thermocouple accuracy of 8 LSBs (2°C) for temperatures ranging from -200°C to +700°C.
Communication with the master microcontroller is over a 1-Wire bus that by definition requires only one data line (and ground) for communication. Operating power can be obtained directly from the data line (“parasite power”), eliminating the need for an external power supply.
Each device has a unique 64-bit serial code, which allows multiple units to function on the same 1-Wire bus. Therefore, it is simple to use one microcontroller (the master device) to monitor temperature from many thermocouples distributed over a large area.
Four location address inputs simplify mapping of individual units to specific locations.
Technical Docs
| Data Sheet | Cold-Junction Compensated, 1-Wire Thermocouple-to-Digital Converters | Jan 09, 2015 |
Support & Training
Search our knowledge base for answers to your technical questions.
Filtered SearchOur dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal.
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