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MAX31855 Datasheet

Thermocouple-to-Digital Converter

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MAX31855
Cold-Junction Compensated
Thermocouple-to-Digital Converter
General Description
The MAX31855 performs cold-junction compensation
and digitizes the signal from a K-, J-, N-, T-, S-, R-, or
E-type thermocouple. The data is output in a signed
14-bit, SPI-compatible, read-only format. This converter
resolves temperatures to 0.25°C, allows readings as
high as +1800°C and as low as -270°C, and exhibits
thermocouple accuracy of ±2°C for temperatures ranging
from -200°C to +700°C for K-type thermocouples. For full
range accuracies and other thermocouple types, see the
Thermal Characteristics specifications.
Applications
● Industrial
● Appliances
● HVAC
Typical Application Circuit
Benefits and Features
● Integration Reduces Design Time and Lowers
System Cost
• 14-Bit, 0.25°C Resolution Converter
• Integrated Cold-Junction Compensation
• Versions Available for Most Common Thermocouple
Types: K-, J-, N-, T-, S-, R-, and E-Type
• Detects Thermocouple Shorts to GND or VCC
• Detects Open Thermocouple
● Interfaces to Most Microcontrollers
• Simple SPI-Compatible Interface (Read-Only)
Ordering Information appears at end of data sheet.
For related parts and recommended products to use with this part, refer
to www.maximintegrated.com/MAX31855.related.
VCC
0.1µF
MAX31855
GND
T+
T-
SO
SCK
CS
MICROCONTROLLER
MISO
SCK
SS
19-5793; Rev 5; 1/15


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX31855 Datasheet

Thermocouple-to-Digital Converter

No Preview Available !

MAX31855
Cold-Junction Compensated
Thermocouple-to-Digital Converter
Absolute Maximum Ratings
Supply Voltage Range (VCC to GND)...................-0.3V to +4.0V
All Other Pins............................................. -0.3V to (VCC + 0.3V)
Continuous Power Dissipation (TA = +70°C)
SO (derate 5.9mW/°C above +70°C).......................470.6mW
ESD Protection (All Pins, Human Body Model)....................±2kV
Operating Temperature Range......................... -40°C to +125°C
Junction Temperature......................................................+150°C
Storage Temperature Range ........................... -65°C to +150°C
Lead Temperature (soldering, 10s).................................+300°C
Soldering Temperature (reflow) ......................................+260°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these
or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect
device reliability.
Package Thermal Characteristics (Note 1)
SO
Junction-to-Ambient Thermal Resistance (θJA).........170°C/W
Junction-to-Case Thermal Resistance (θJC)................40°C/W
Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-layer
board. For detailed information on package thermal considerations, refer to www.maximintegrated.com/thermal-tutorial.
Recommended Operating Conditions
(TA = -40°C to +125°C, unless otherwise noted.)
PARAMETER
Power-Supply Voltage
Input Logic 0
SYMBOL
VCC
VIL
(Note 2)
Input Logic 1
VIH
CONDITIONS
MIN TYP MAX UNITS
3.0 3.3 3.6
V
-0.3
+0.8
V
2.1
VCC +
0.3
V
DC Electrical Characteristics
(3.0V ≤ VCC P 3.6V, TA = -40°C to +125°C, unless otherwise noted.)
PARAMETER
Power-Supply Current
Thermocouple Input Bias Current
Power-Supply Rejection
Power-On Reset Voltage
Threshold
Power-On Reset Voltage
Hysteresis
SYMBOL
ICC
CONDITIONS
TA = -40°C to +125°C, 100mV across the
thermocouple inputs
VPOR (Note 3)
Output High Voltage
Output Low Voltage
VOH
VOL
IOUT = -1.6mA
IOUT = 1.6mA
MIN
-100
TYP
900
-0.3
2
MAX
1500
+100
2.5
UNITS
µA
nA
°C/V
V
VCC -
0.4
0.2
0.4
V
V
V
www.maximintegrated.com
Maxim Integrated 2


Part Number MAX31855
Description Thermocouple-to-Digital Converter
Maker Maxim Integrated Products
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MAX31855 Datasheet PDF






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