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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX31856 Datasheet

Precision Thermocouple to Digital Converter

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MAX31856
EVALUATION KIT AVAILABLE
Precision Thermocouple to Digital Converter
with Linearization
General Description
The MAX31856 performs cold-junction compensation
and digitizes the signal from any type of thermocouple.
The output data is formatted in degrees Celsius. This
converter resolves temperatures to 0.0078125°C, allows
readings as high as +1800°C and as low as -210°C
(depending on thermocouple type), and exhibits thermo-
couple voltage measurement accuracy of ±0.15%. The
thermocouple inputs are protected against overvoltage
conditions up to ±45V.
A lookup table (LUT) stores linearity correction data for
several types of thermocouples (K, J, N, R, S, T, E, and
B). Line frequency filtering of 50Hz and 60Hz is included,
as is thermocouple fault detection. A SPI-compatible inter-
face allows selection of thermocouple type and setup of
the conversion and fault detection processes.
Applications
● Temperature Controllers
● Industrial Ovens, Furnaces, and Environmental
Chambers
● Industrial Equipment
Ordering Information appears at end of data sheet.
Typical Application Circuit
Benefits and Features
● Provides High-Accuracy Thermocouple Temperature
Readings
• Includes Automatic Linearization Correction for 8
Thermocouple Types
• ±0.15% (max, -20°C to +85°C) Thermocouple Full-
Scale and Linearity Error
• 19-Bit, 0.0078125°C Thermocouple Temperature
Resolution
● Internal Cold-Junction Compensation Minimizes
System Components
• ±0.7°C (max, -20°C to +85°C) Cold-Junction
Accuracy
● ±45V Input Protection Provides Robust System
Performance
● Simplifies System Fault Management and
Troubleshooting
• Detects Open Thermocouples
• Over- and Undertemperature Fault Detection
● 50Hz/60Hz Noise Rejection Filtering Improves
System Performance
● 14-Pin TSSOP Package
0.01µF
0.1µF
0.01µF
3.3V
0.1µF
AGND
BIAS
T-
T+
AVDD
DNC
DRDY
DGND
MAX31856
FAULT
SDI
SDO
SCK
CS
DVDD
0.1µF
3.3V
TO MICROCONTROLLER
19-7534; Rev 0; 2/15


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX31856 Datasheet

Precision Thermocouple to Digital Converter

No Preview Available !

MAX31856
Precision Thermocouple to Digital Converter
with Linearization
Absolute Maximum Ratings
AVDD, DVDD........................................................-0.3V to +4.0V
T+, T-, Bias...........................................................................±45V
T+, T-, Bias........................................................................±20mA
All Other Pins........................................-0.3V to (VDVDD + 0.3V)
Continuous Power Dissipation (TA = +70°C)
TSSOP (derate 9.1mW/°C above +70°C)...................727.3mW
ESD Protection (All pins, Human Body Model)..................2000V
Operating Temperature Range.......................... -55°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) .................See IPC/JEDEC J-STD-020A Specification
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)
TSSOP
Junction-to-Ambient Thermal Resistance (θJA).........110°C/W
Junction-to-Case Thermal Resistance (θJC)................30°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 DC Operating Conditions
(TA = -55°C to +125°C, unless otherwise noted.)(Notes 2 and 4)
PARAMETER
SYMBOL
CONDITIONS
Power-Supply Voltage
AVDD-DVDD
Cable Resistance
Input Logic 0
Input Logic 1
VAVDD,
VDVDD
RCABLE
VIL
VIH
Per lead
MIN
3.0
-100
2.1
TYP
3.3
MAX UNITS
3.6 V
+100
40
0.8
mV
kΩ
V
V
Electrical Characteristics
(3.0V VDD 3.6V, TA = -55°C to +125°C, unless otherwise noted.)(Notes 2, 3, and 4)
PARAMETER
Supply Current
Thermocouple Temperature
Resolution
Cold-Junction Temperature Data
Resolution
Thermocouple Input Bias Current
SYMBOL
IDD
ITCBIAS
CONDITIONS
Standby
Active conversion
TA = +25°C
TA = -40°C to +85°C
TA = -55°C to +105°C
TA = -55°C to +125°C
MIN
TYP
MAX UNITS
5.25
10 µA
1.2 2 mA
19 Bits
0.0078125
°C
0.015625
°C
-10 +10
-10 +65
nA
-20 +110
-20 +400
www.maximintegrated.com
Maxim Integrated 2


Part Number MAX31856
Description Precision Thermocouple to Digital Converter
Maker Maxim Integrated
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MAX31856 Datasheet PDF






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