Data Sheet

MAX6675
Cold-Junction-Compensated K-Thermocouple-
to-Digital Converter (0°C to +1024°C)
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
CC
= +3.0V to +5.5V, T
A
= -20°C to +85°C, unless otherwise noted. Typical values specified at +25°C.) (Note 1)
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.
Supply Voltage (V
CC
to GND) ................................ -0.3V to +6V
SO, SCK,
CS, T-, T+ to GND .......................-0.3V to V
CC
+ 0.3V
SO Current ........................................................................ 50mA
ESD Protection (Human Body Model) ........................... ±2000V
Continuous Power Dissipation (T
A
= +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
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
V
CC
= +3.3V -5 +5
T
THERMOCOUPLE
= +700°C,
T
A
= +25°C (Note 2)
V
CC
= +5V -6 +6
V
CC
= +3.3V -8 +8
T
THERMOCOUPLE
= 0°C to
+700°C, T
A
= +25°C (Note 2)
V
CC
= +5V -9 +9
V
CC
= +3.3V -17
+17
Temperature Error
T
THERMOCOUPLE
= +700°C
to +1000°C, T
A
= +25°C
(Note 2)
V
CC
= +5V -19
+19
LSB
Thermocouple Conversion
Constant
10.25
µV/LSB
V
CC
= +3.3V
-3.0 +3.0
Cold-Junction
Compensation Error
T
A
= -20°C to +85°C
(Note 2)
V
CC
= +5V
-3.0 +3.0
°C
Resolution
0.25
°C
Thermocouple Input
Impedance
60 kΩ
Supply Voltage V
CC
3.0 5.5 V
Supply Current I
CC
0.7 1.5 mA
Power-On Reset Threshold V
CC
rising 1 2 2.5 V
Power-On Reset Hysteresis 50 mV
Conversion Time (Note 2)
0.17 0.22
s
SERIAL INTERFACE
Input Low Voltage V
IL
0.3 x
V
CC
V
Input High Voltage V
IH
0.7 x
V
CC
V
Input Leakage Current I
LEAK
V
IN
= GND or V
CC
±5µA
Input Capacitance C
IN
5pF