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MAX31851 Datasheet(PDF) 1 Page - Maxim Integrated Products |
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MAX31851 Datasheet(HTML) 1 Page - Maxim Integrated Products |
1 / 25 page MAX31850/MAX31851 Cold-Junction Compensated, 1-Wire Thermocouple-to-Digital Converters General Description The MAX31850/MAX31851 cold-junction compensat- ed, 1-WireM 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 con- verters resolve temperatures to 0.25NC, allow readings as high as +1768NC and as low as -270NC, and exhibit thermocouple accuracy of 8 LSBs (2NC) for temperatures ranging from -200NC to +700NC. 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 ther- mocouples distributed over a large area. Four location address inputs simplify mapping of individual units to specific locations. Features S Cold-Junction Compensation S 14-Bit, 0.25NC Resolution S Versions Available for K-, J-, N-, T-, S-, R-, and E-Type Thermocouples (see Table 1) S 1-Wire Interface (Read-Only); Power Can Be Obtained from Interface (Parasite-Powered Mode) S Detects Thermocouple Shorts to GND or VDD S Detects Open Thermocouple Applications Industrial Appliances HVAC Medical Block Diagram 19-6725; Rev 0; 6/13 Ordering Information appears at end of data sheet. 1-Wire is a registered trademark of Maxim Integrated Products, Inc. For related parts and recommended products to use with this part, refer to: www.maximintegrated.com/MAX31850.related EVALUATION KIT AVAILABLE MAX31850 MAX31851 64-BIT ROM AND 1-Wire PORT ADC PARASITE- POWER CIRCUIT CPP DQ VDD GND MEMORY CONTROL LOGIC COLD-JUCTION COMPENSATION FAULT DETECTION REFERENCE VOLTAGE POWER- SUPPLY SENSE ADDRESS PIN INPUT AD0 AD1 AD2 AD3 SCRATCHPAD S5 S1 S3 T+ T- S2 S4 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com. |
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