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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX31850 Datasheet

(MAX31850 / MAX31851) 1-Wire Thermocouple-to-Digital Converters

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EVALUATION KIT AVAILABLE
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.
Benefits and Features
S Integration Reduces Design Time and Lowers
System Cost
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
Multisensor Systems
1-Wire Interface (Read-Only); Power Can Be
Obtained from Interface (Parasite-Powered Mode)
Applications
Industrial
Appliances
HVAC
Medical
Ordering Information appears at end of data sheet.
Block Diagram
COLD-JUNCTION
COMPENSATION
S5
MAX31850
MAX31851
T+
T-
S1
S2
S3
S4
ADC
FAULT
DETECTION
REFERENCE
VOLTAGE
64-BIT ROM
AND
1-Wire PORT
MEMORY
CONTROL LOGIC
SCRATCHPAD
ADDRESS PIN INPUT
PARASITE-
POWER
CIRCUIT
CPP
POWER-
SUPPLY
SENSE
DQ
VDD
GND
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


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX31850 Datasheet

(MAX31850 / MAX31851) 1-Wire Thermocouple-to-Digital Converters

No Preview Available !

MAX31850/MAX31851
Cold-Junction Compensated, 1-Wire
Thermocouple-to-Digital Converters
ABSOLUTE MAXIMUM RATINGS
Supply Voltage Range (VDD to GND)...................-0.3V to +4.0V
All Other Pins............................................. -0.3V to (VDD + 0.3V)
Continuous Power Dissipation (TA = +70NC)
TDFN (derate 16.70mW/NC above +70NC)............1333.30mW
ESD Protection (All Pins, Human Body Model)....................±2kV
Operating Temperature Range......................... -40NC to +125NC
Junction Temperature......................................................+150NC
Storage Temperature Range ........................... -65NC to +150NC
Lead Temperature (soldering, 10s).................................+300NC
Soldering Temperature (reflow) ......................................+260NC
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional opera-
tion 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)
TDFN
Junction-to-Ambient Thermal Resistance (BJA)...........60NC/W
Junction-to-Case Thermal Resistance (BJC)................30NC/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.
DC ELECTRICAL CHARACTERISTICS
(TA = -40NC to +125NC, unless otherwise noted.) (Note 2)
PARAMETER
Supply Voltage
Pullup Supply Voltage
(Notes 3, 4)
Input Logic-Low
SYMBOL
CONDITIONS
VDD Local power (Note 3, 4)
VPU
Parasite power (Note 3)
Local power (Note 3)
VIL (Notes 4, 6)
Input Logic-High (Note 4)
Local power
VIH
Parasite power
MIN
3.0
3.0
3.0
-0.3
2.2
3.0
Output Sink Current
Standby Supply Current
Active Supply Current
DQ Input Current
Power-Supply Rejection
Input Leakage Current (AD0–AD3 Pins)
Thermocouple Input Bias Current
IL
IDDS
IDD
IDQ
IBTC
VI/O = 0.4V (Note 4)
(Notes 7, 8)
VDD = 3.7V (Note 9)
(Note 10)
(Note 3)
TA = -40°C to +125°C, 100mV across
the thermocouple inputs (Note 3)
4.0
-1
-100
TYP MAX UNITS
3.3 3.7
V
3.7
VDD
+0.8
V
V
lower
of 3.7V
or
(VDD +
0.3V)
lower
of 3.7V
or
(VDD +
0.3V)
V
mA
280 1000
nA
900 1750
FA
5 FA
-0.3 °C/V
+1 FA
+100
nA
Maxim Integrated
  2


Part Number MAX31850
Description (MAX31850 / MAX31851) 1-Wire Thermocouple-to-Digital Converters
Maker Maxim Integrated Products
PDF Download

MAX31850 Datasheet PDF






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