Storage Temperature Range ........................... -65°C to +150°C
Lead Temperature (soldering, 10s).................................+300°C
Soldering Temperature (reflow) ......................................+260°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.
Package Thermal Characteristics
(Note 1)
SO
Junction-to-Ambient Thermal Resistance (θ
JA
) ........170°C/W
Junction-to-Case Thermal Resistance (θ
JC
) ...............40°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 Operating Conditions
(T
A
= -40°C to +125°C, unless otherwise noted.)
PARAMETER
Power-Supply Voltage
Input Logic 0
Input Logic 1
SYMBOL
V
CC
V
IL
V
IH
(Note 2)
CONDITIONS
MIN
3.0
-0.3
2.1
TYP
3.3
MAX
3.6
+0.8
V
CC
+
0.3
UNITS
V
V
V
DC Electrical Characteristics
(3.0V ≤ V
CC
P 3.6V, T
A
= -40°C to +125°C, unless otherwise noted.)
PARAMETER
Power-Supply Current
Thermocouple Input Bias Current
Power-Supply Rejection
Power-On Reset Voltage
Threshold
Power-On Reset Voltage
Hysteresis
Output High Voltage
Output Low Voltage
V
OH
V
OL
I
OUT
= -1.6mA
I
OUT
= 1.6mA
V
CC
-
0.4
0.4
V
POR
(Note 3)
SYMBOL
I
CC
T
A
= -40°C to +125°C, 100mV across the
thermocouple inputs
-100
-0.3
2
0.2
2.5
CONDITIONS
MIN
TYP
900
MAX
1500
+100
UNITS
µA
nA
°C/V
V
V
V
V
www.maximintegrated.com
Maxim Integrated
│
2
MAX31855
Cold-Junction Compensated
Thermocouple-to-Digital Converter
Thermal Characteristics
(3.0V ≤ V
CC
P 3.6V, T
A
= -40°C to +125°C, unless otherwise noted.) (Note 4)
PARAMETER
MAX31855K Thermocouple
Temperature Gain and Offset
Error (41.276µV/°C nominal
sensitivity) (Note 4)
MAX31855J Thermocouple
Temperature Gain and Offset
Error (57.953µV/°C nominal
sensitivity) (Note 4)
MAX31855N Thermocouple
Temperature Gain and Offset
Error (36.256µV/°C nominal
sensitivity) (Note 4)
MAX31855T Thermocouple
Temperature Gain and Offset
Error (52.18µV/°C nominal
sensitivity) (Note 4)
MAX31855E Thermocouple
Temperature Gain and Offset
Error (76.373µV/°C nominal
sensitivity) (Note 4)
SYMBOL
CONDITIONS
T
THERMOCOUPLE
= -200°C to +700°C,
T
A
= -20°C to +85°C (Note 3)
T
THERMOCOUPLE
= +700°C to +1350°C,
T
A
= -20°C to +85°C (Note 3)
T
THERMOCOUPLE
= -270°C to +1372°C,
T
A
= -40°C to +125°C (Note 3)
T
THERMOCOUPLE
= -210°C to +750°C,
T
A
= -20°C to +85°C (Note 3)
T
THERMOCOUPLE
= -210°C to +1200°C,
T
A
= -40°C to +125°C (Note 3)
T
THERMOCOUPLE
= -200°C to +700°C,
T
A
= -20°C to +85°C (Note 3)
T
THERMOCOUPLE
= +700°C to +1300°C,
T
A
= -20°C to +85°C (Note 3)
T
THERMOCOUPLE
= -270°C to +1300°C,
T
A
= -40°C to +125°C (Note 3)
T
THERMOCOUPLE
= -270°C to +400°C,
T
A
= -20°C to +85°C (Note 3)
T
THERMOCOUPLE
= -270°C to +400°C,
T
A
= -40°C to +125°C (Note 3)
T
THERMOCOUPLE
= -200°C to +700°C,
T
A
= -20°C to +85°C (Note 3)
T
THERMOCOUPLE
= +700°C to +1000°C,
T
A
= -20°C to +85°C (Note 3)
T
THERMOCOUPLE
= -270°C to +1000°C,
T
A
= -40°C to +125°C (Note 3)
T
THERMOCOUPLE
= -50°C to +700°C,
T
A
= -20°C to +85°C (Note 3)
T
THERMOCOUPLE
= +700°C to +1768°C,
T
A
= -20°C to +85°C (Note 3)
T
THERMOCOUPLE
= -50°C to +1768°C,
T
A
= -40°C to +125°C (Note 3)
T
THERMOCOUPLE
= -50°C to +700°C,
T
A
= -20°C to +85°C (Note 3)
T
THERMOCOUPLE
= +700°C to +1768°C,
T
A
= -20°C to +85°C (Note 3)
T
THERMOCOUPLE
= -50°C to +1768°C,
T
A
= -40°C to +125°C (Note 3)
MIN
-2
-4
-6
-2
-4
-2
-4
-6
-2
-4
-2
-3
-5
-2
-4
-6
-2
-4
-6
TYP
MAX
+2
+4
+6
+2
°C
+4
+2
+4
+6
+2
°C
+4
+2
+3
+5
+2
+4
+6
+2
+4
+6
°C
°C
°C
°C
°C
UNITS
MAX31855R Thermocouple
Temperature Gain and Offset
Error (10.506µV/°C nominal
sensitivity) (Note 4)
MAX31855S Thermocouple
Temperature Gain and Offset
Error (9.587µV/°C nominal
sensitivity) (Note 4)
www.maximintegrated.com
Maxim Integrated
│
3
MAX31855
Cold-Junction Compensated
Thermocouple-to-Digital Converter
Thermal Characteristics (continued)
(3.0V ≤ V
CC
P 3.6V, T
A
= -40°C to +125°C, unless otherwise noted.) (Note 4)
PARAMETER
Thermocouple Temperature Data
Resolution
Internal Cold-Junction
Temperature Error
Cold-Junction Temperature Data
Resolution
Temperature Conversion Time
(Thermocouple, Cold Junction,
Fault Detection)
Thermocouple Conversion
Power-Up Time
t
CONV
t
CONV_PU
T
A
= -20°C to +85°C (Note 3)
T
A
= -40°C to +125°C
(Note 5)
(Note 6)
200
-2
-3
0.0625
70
100
T
A
= -40°C to +125°C (Note 3)
SYMBOL
CONDITIONS
MIN
TYP
0.25
+2
+3
MAX
UNITS
°C
°C
°C
ms
ms
Serial-Interface Timing Characteristics
(See
Figure 1
and
Figure 2.)
PARAMETER
Input Leakage Current
Input Capacitance
Serial-Clock Frequency
SCK Pulse-High Width
SCK Pulse-Low Width
SCK Rise and Fall Time
CS
Fall to SCK Rise
SCK to
CS
Hold
CS
Fall to Output Enable
CS
Rise to Output Disable
SCK Fall to Output Data Valid
CS
Inactive Time
Note
Note
Note
Note
2:
3:
4:
5:
t
DV
t
TR
t
DO
(Note 3)
200
t
CSS
100
100
100
40
40
SYMBOL
I
LEAK
C
IN
f
SCL
t
CH
t
CL
100
100
200
(Note 7)
CONDITIONS
MIN
-1
8
5
TYP
MAX
+1
UNITS
µA
pF
MHz
ns
ns
ns
ns
ns
ns
ns
ns
ns
All voltages are referenced to GND. Currents entering the IC are specified positive, and currents exiting the IC are negative.
Guaranteed by design; not production tested.
Not including cold-junction temperature error or thermocouple nonlinearity.
Specification is 100% tested at T
A
= +25°C. Specification limits over temperature (T
A
= T
MIN
to T
MAX
) are guaranteed by
design and characterization; not production tested.
Note 6:
Because the thermocouple temperature conversions begin at V
POR
, depending on V
CC
slew rates, the first thermocouple
temperature conversion may not produce an accurate result. Therefore, the t
CONV_PU
specification is required after V
CC
is
greater than V
CCMIN
to guarantee a valid thermocouple temperature conversion result.
Note 7:
For all pins except T+ and T- (see the Thermocouple Input Bias Current parameter in the
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