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MOD-TC-MK2-31855

daughter cards & oem boards K type thermocouple max31855

器件类别:开发板/开发套件/开发工具   

厂商名称:Olimex

厂商官网:https://www.olimex.com

器件标准:  

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器件参数
参数名称
属性值
Manufacture
Olimex Ltd.
产品种类
Product Category
Daughter Cards & OEM Boards
RoHS
Yes
Produc
Add-on Modules
用于
For Use With
PIC16F1503, MAX31855, UEXT
Description/Functi
K-Type thermocouple interface board with PIC16F1503, MAX31855, UEXT
Dimensions
36.56 mm x 17.78 mm
接口类型
Interface Type
I2C
文档预览
19-5793; Rev 2; 2/12
MAX31855
Cold-Junction Compensated
Thermocouple-to-Digital Converter
General Description
The MAX31855 performs cold-junction compensation
and digitizes the signal from a K-, J-, N-, T-, S-, R-, or
E-type thermocouple. The data is output in a signed
14-bit, SPI-compatible, read-only format. This converter
resolves temperatures to 0.25NC, allows readings as high
as +1800NC and as low as -270NC, and exhibits thermo-
couple accuracy of ±2NC for temperatures ranging from
-200NC to +700NC for K-type thermocouples. For full
range accuracies and other thermocouple types, see the
Thermal Characteristics
specifications.
S
Cold-Junction Compensation
S
14-Bit, 0.25NC Resolution
S
Versions Available for K-, J-, N-, T-, S-, R-, and
E-Type Thermocouples (see
Table 1)
S
Simple SPI-Compatible Interface (Read-Only)
S
Detects Thermocouple Shorts to GND or V
CC
S
Detects Open Thermocouple
Features
Applications
Industrial
Appliances
HVAC
Automotive
Ordering Information
appears at end of data sheet.
For related parts and recommended products to use with this part,
refer to:
www.maxim-ic.com/MAX31855.related
Typical Application Circuit
V
CC
0.1µF
MAX31855
GND
SO
T+
T-
SCK
CS
MISO
SCK
SS
MICROCONTROLLER
½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
MAX31855
Cold-Junction Compensated
Thermocouple-to-Digital Converter
ABSOLUTE MAXIMUM RATINGS
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
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)
SO
Junction-to-Ambient Thermal Resistance (B
JA
) ........170NC/W
Junction-to-Case Thermal Resistance (B
JC
) ...............40NC/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.maxim-ic.com/thermal-tutorial.
RECOMMENDED OPERATING CONDITIONS
(T
A
= -40NC to +125NC, 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
P
V
CC
P
3.6V, T
A
= -40NC to +125NC, 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
= -40NC to +125NC, 100mV across the
thermocouple inputs
-100
-0.3
2
0.2
2.5
CONDITIONS
MIN
TYP
900
MAX
1500
+100
UNITS
FA
nA
NC/V
V
V
V
V
½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½
Maxim Integrated Products
2
MAX31855
Cold-Junction Compensated
Thermocouple-to-Digital Converter
THERMAL CHARACTERISTICS
(3.0V
P
V
CC
P
3.6V, T
A
= -40NC to +125NC, unless otherwise noted.) (Note 4)
PARAMETER
MAX31855K Thermocouple
Temperature Gain and Offset
Error (41.276FV/NC nominal
sensitivity) (Note 4)
SYMBOL
CONDITIONS
T
THERMOCOUPLE
= -200NC to +700NC,
T
A
= -20NC to +85NC (Note 3)
T
THERMOCOUPLE
= +700NC to +1350NC,
T
A
= -20NC to +85NC (Note 3)
T
THERMOCOUPLE
= -270NC to +1372NC,
T
A
= -40NC to +125NC (Note 3)
T
THERMOCOUPLE
= -210NC to +750NC,
T
A
= -20NC to +85NC (Note 3)
T
THERMOCOUPLE
= -210NC to +1200NC,
T
A
= -40NC to +125NC (Note 3)
T
THERMOCOUPLE
= -200NC to +700NC,
T
A
= -20NC to +85NC (Note 3)
T
THERMOCOUPLE
= +700NC to +1300NC,
T
A
= -20NC to +85NC (Note 3)
T
THERMOCOUPLE
= -270NC to +1300NC,
T
A
= -40NC to +125NC (Note 3)
T
THERMOCOUPLE
= -270NC to +400NC,
T
A
= -20NC to +85NC (Note 3)
T
THERMOCOUPLE
= -270NC to +400NC,
T
A
= -40NC to +125NC (Note 3)
T
THERMOCOUPLE
= -200NC to +700NC,
T
A
= -20NC to +85NC (Note 3)
T
THERMOCOUPLE
= +700NC to +1000NC,
T
A
= -20NC to +85NC (Note 3)
T
THERMOCOUPLE
= -270NC to +1000NC,
T
A
= -40NC to +125NC (Note 3)
T
THERMOCOUPLE
= -50NC to +700NC,
T
A
= -20NC to +85NC (Note 3)
T
THERMOCOUPLE
= +700NC to +1768NC,
T
A
= -20NC to +85NC (Note 3)
T
THERMOCOUPLE
= -50NC to +1768NC,
T
A
= -40NC to +125NC (Note 3)
T
THERMOCOUPLE
= -50NC to +700NC,
T
A
= -20NC to +85NC (Note 3)
T
THERMOCOUPLE
= +700NC to +1768NC,
T
A
= -20NC to +85NC (Note 3)
T
THERMOCOUPLE
= -50NC to +1768NC,
T
A
= -40NC to +125NC (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
NC
+4
+2
+4
+6
+2
NC
+4
+2
+3
+5
+2
+4
+6
+2
+4
+6
NC
NC
NC
NC
NC
UNITS
MAX31855J Thermocouple
Temperature Gain and Offset
Error (57.953FV/NC nominal
sensitivity) (Note 4)
MAX31855N Thermocouple
Temperature Gain and Offset
Error (36.256FV/NC nominal
sensitivity) (Note 4)
MAX31855T Thermocouple
Temperature Gain and Offset
Error (52.18FV/NC nominal
sensitivity) (Note 4)
MAX31855E Thermocouple
Temperature Gain and Offset
Error (76.373FV/NC nominal
sensitivity) (Note 4)
MAX31855R Thermocouple
Temperature Gain and Offset
Error (10.506FV/NC nominal
sensitivity) (Note 4)
MAX31855S Thermocouple
Temperature Gain and Offset
Error (9.587FV/NC nominal
sensitivity) (Note 4)
½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½
Maxim Integrated Products
3
MAX31855
Cold-Junction Compensated
Thermocouple-to-Digital Converter
THERMAL CHARACTERISTICS (continued)
(3.0V
P
V
CC
P
3.6V, T
A
= -40NC to +125NC, 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
= -20NC to +85NC (Note 3)
T
A
= -40NC to +125NC (Note 3)
T
A
= -40NC to +125NC
(Note 5)
-2
-3
0.0625
SYMBOL
CONDITIONS
MIN
TYP
0.25
+2
+3
MAX
UNITS
NC
NC
NC
70
100
ms
(Note 6)
200
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 2:
Note 3:
Note 4:
Note 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
= +25NC. 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
DC Electrical Characteristics
table).
½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½
Maxim Integrated Products
4
MAX31855
Cold-Junction Compensated
Thermocouple-to-Digital Converter
Serial-Interface Diagrams
CS
SCK
SO
D31
D8
D7
D6
D5
D4
D3
D2
D1
D0
Figure 1. Serial-Interface Protocol
t
CSS
CS
t
CH
SCK
t
DV
SO
D31
D3
D2
D1
D0
t
DO
t
TR
t
CL
Figure 2. Serial-Interface Timing
½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½
Maxim Integrated Products
5
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