EVALUATION KIT AVAILABLE
Cold-Junction Compensated, 1-Wire
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.
Benefits and Features
S Integration Reduces Design Time and Lowers
• 14-Bit, 0.25NC 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
S 1-Wire Multiddrop Capability Simplifies
• 1-Wire Interface (Read-Only); Power Can Be
Obtained from Interface (Parasite-Powered Mode)
Ordering Information appears at end of data sheet.
ADDRESS PIN INPUT
AD0 AD1 AD2 AD3
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
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.
19-6725; Rev 2; 1/15