Datasheet
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MAX31855
Cold-Junction Compensated
Thermocouple-to-Digital Converter
Supply Voltage Range (V
CC
to GND) .................. -0.3V to +4.0V
All Other Pins ............................................ -0.3V to (V
CC
+ 0.3V)
Continuous Power Dissipation (T
A
= +70NC)
SO (derate 5.9mW/NC above +70NC) ....................... 470.6mW
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
SO
Junction-to-Ambient Thermal Resistance (B
JA
) ........170NC/W
Junction-to-Case Thermal Resistance (B
JC
) ...............40NC/W
ABSOLUTE MAXIMUM RATINGS
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.maxim-ic.com/thermal-tutorial.
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)
RECOMMENDED OPERATING CONDITIONS
(T
A
= -40NC to +125NC, unless otherwise noted.)
DC ELECTRICAL CHARACTERISTICS
(3.0V P V
CC
P 3.6V, T
A
= -40NC to +125NC, unless otherwise noted.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Power-Supply Voltage V
CC
(Note 2) 3.0 3.3 3.6 V
Input Logic 0 V
IL
-0.3 +0.8 V
Input Logic 1 V
IH
2.1
V
CC
+
0.3
V
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Power-Supply Current I
CC
900 1500
FA
Thermocouple Input Bias Current
T
A
= -40NC to +125NC, 100mV across the
thermocouple inputs
-100 +100 nA
Power-Supply Rejection -0.3
NC/V
Power-On Reset Voltage
Threshold
V
POR
(Note 3) 2 2.5 V
Power-On Reset Voltage
Hysteresis
0.2 V
Output High Voltage V
OH
I
OUT
= -1.6mA
V
CC
-
0.4
V
Output Low Voltage V
OL
I
OUT
= 1.6mA 0.4 V