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MAX6675 Datasheet

Cold-Junction-Compensated K-Thermocoupleto-Digital Converter

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MAX6675
EVALUATION KIT AVAILABLE
Cold-Junction-Compensated K-Thermocouple-
to-Digital Converter (0°C to +1024°C)
General Description
The MAX6675 performs cold-junction compensation and
digitizes the signal from a type-K thermocouple. The
data is output in a 12-bit resolution, SPI™-compatible,
read-only format.
This converter resolves temperatures to 0.25°C, allows
readings as high as +1024°C, and exhibits thermocouple
accuracy of 8LSBs for temperatures ranging from 0°C to
+700°C.
The MAX6675 is available in a small, 8-pin SO package.
Applications
● Industrial
● Appliances
● HVAC
Features
● Direct Digital Conversion of Type -K Thermocouple
Output
● Cold-Junction Compensation
● Simple SPI-Compatible Serial Interface
● 12-Bit, 0.25°C Resolution
● Open Thermocouple Detection
Ordering Information
PART
MAX6675ISA
TEMP RANGE
-20°C to +85°C
PIN-PACKAGE
8 SO
Pin Configuration
TOP VIEW
SPI is a trademark of Motorola, Inc.
GND 1
T- 2
T+ 3
VCC 4
MAX6675
8 N.C.
7 SO
6 CS
5 SCK
SO
Typical Application Circuit
0.1µF
Vcc
MAX6675
GND
SO
T+ SCK
T- CS
MICROCONTROLLER
68HC11A8
MISO
SCK
SSB
19-2235; Rev 2; 4/14


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX6675 Datasheet

Cold-Junction-Compensated K-Thermocoupleto-Digital Converter

No Preview Available !

MAX6675
Cold-Junction-Compensated K-Thermocouple-
to-Digital Converter (0°C to +1024°C)
Absolute Maximum Ratings
Supply Voltage (VCC to GND) ................................ -0.3V to +6V
SO, SCK, CS, T-, T+ to GND ......................-0.3V to VCC + 0.3V
SO Current ........................................................................ 50mA
ESD Protection (Human Body Model) ........................... ±2000V
Continuous Power Dissipation (TA = +70°C)
8-Pin SO (derate 5.88mW/°C above +70°C) ............. 471mW
Operating Temperature Range ........................... -20°C to +85°C
Storage Temperature Range ............................ -65°C to +150°C
Junction Temperature ..................................................... +150°C
SO Package
Vapor Phase (60s) .......................................................+215°C
Infrared (15s) ............................................................... +220°C
Lead Temperature (soldering, 10s) ................................ +300°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.
Electrical Characteristics
(VCC = +3.0V to +5.5V, TA = -20°C to +85°C, unless otherwise noted. Typical values specified at +25°C.) (Note 1)
PARAMETER
Temperature Error
Thermocouple Conversion
Constant
Cold-Junction
Compensation Error
Resolution
Thermocouple Input
Impedance
Supply Voltage
Supply Current
Power-On Reset Threshold
Power-On Reset Hysteresis
Conversion Time
SERIAL INTERFACE
SYMBOL
CONDITIONS
TTHERMOCOUPLE = +700°C,
TA = +25°C (Note 2)
TTHERMOCOUPLE = 0°C to
+700°C, TA = +25°C (Note 2)
TTHERMOCOUPLE = +700°C
to +1000°C, TA = +25°C (Note 2)
VCC = +3.3V
VCC = +5V
VCC = +3.3V
VCC = +5V
VCC = +3.3V
VCC = +5V
T A = - 2 0 ° C t o VCC = +3.3V
+85°C (Note 2)
VCC = +5V
VCC
ICC
VCC rising
(Note 2)
MIN TYP MAX
-5 +5
-6 +6
-8 +8
-9 +9
-17 +17
-19 +19
10.25
-3.0 +3.0
-3.0 +3.0
0.25
60
3.0 5.5
0.7 1.5
1 2 2.5
50
0.17 0.22
Input Low Voltage
Input High Voltage
Input Leakage Current
Input Capacitance
VIL
VIH
ILEAK
CIN
VIN = GND or VCC
0.3 x
VCC
0.7 x
VCC
±5
5
UNITS
LSB
µV/LSB
°C
°C
kW
V
mA
V
mV
s
V
V
µA
pF
www.maximintegrated.com
Maxim Integrated 2


Part Number MAX6675
Description Cold-Junction-Compensated K-Thermocoupleto-Digital Converter
Maker Maxim
Total Page 8 Pages
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