MAX31855 Ver la hoja de datos (PDF) - Maxim Integrated
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MAX31855 Datasheet PDF : 13 Pages
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MAX31855
Cold-Junction Compensated
Thermocouple-to-Digital Converter
Table 2. Memory Map—Bit Weights and Functions
14-BIT THERMOCOUPLE
TEMPERATURE DATA
BIT
D31
D30
…
D18
RES
D17
FAULT
BIT
D16
12-BIT INTERNAL TEMPERATURE
DATA
D15 D14 …
D4
RES
D3
MSB 210
LSB 2-2
VALUE Sign
…
Reserved
(1024NC)
(0.25NC)
1=
Fault
MSB
Sign
26
…
LSB 2-4
Reserved
(0.0625NC)
(64NC)
SCV
BIT
D2
1=
Short
to
VCC
SCG
BIT
D1
1=
Short
to
GND
OC
BIT
D0
1=
Open
Circuit
Table 3. Memory Map—Descriptions
BIT
D[31:18]
D17
D16
D[15:4]
D3
D2
D1
D0
NAME
14-Bit Thermocouple
Temperature Data
Reserved
Fault
12-Bit Internal Temperature
Data
Reserved
SCV Fault
SCG Fault
OC Fault
DESCRIPTION
These bits contain the signed 14-bit thermocouple temperature value. See Table 4.
This bit always reads 0.
This bit reads at 1 when any of the SCV, SCG, or OC faults are active. Default value
is 0.
These bits contain the signed 12-bit value of the reference junction temperature.
See Table 5.
This bit always reads 0.
This bit is a 1 when the thermocouple is short-circuited to VCC. Default value is 0.
This bit is a 1 when the thermocouple is short-circuited to GND. Default value is 0.
This bit is a 1 when the thermocouple is open (no connections). Default value is 0.
Table 4. Thermocouple Temperature Data
Format
TEMPERATURE
(NC)
+1600.00
+1000.00
+100.75
+25.00
0.00
-0.25
-1.00
-250.00
DIGITAL OUTPUT
(D[31:18])
0110 0100 0000 00
0011 1110 1000 00
0000 0110 0100 11
0000 0001 1001 00
0000 0000 0000 00
1111 1111 1111 11
1111 1111 1111 00
1111 0000 0110 00
Note: The practical temperature ranges vary with the
thermocouple type.
Table 5. Reference Junction Temperature
Data Format
TEMPERATURE
(NC)
+127.0000
+100.5625
+25.0000
0.0000
-0.0625
-1.0000
-20.0000
-55.0000
DIGITAL OUTPUT
(D[15:4])
0111 1111 0000
0110 0100 1001
0001 1001 0000
0000 0000 0000
1111 1111 1111
1111 1111 0000
1110 1100 0000
1100 1001 0000
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