MAX31850NATB View Datasheet(PDF) - Maxim Integrated
Part Name
Description
Manufacturer
MAX31850NATB Datasheet PDF : 25 Pages
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MAX31850/MAX31851
Cold-Junction Compensated, 1-Wire
Thermocouple-to-Digital Converters
Configuration Register
Byte 4 of Scratchpad contains the configuration reg-
ister, which is organized as shown in Configuration
Register Format. The configuration register allows the
user to read the programmed value of the address pins.
The AD[3:0] bits report the pin-programmed location
information. Pins connected to DQ are reported with
logic 1, and pins connected to GND are reported as
logic 0. Pins connected to DQ or GND through a resis-
tor are valid logic 1s or logic 0s if the resistor is less
than 10kI. Unconnected or high-impedance ( > 10kI)
connections are indeterminate. Bits [7:4] are reserved
for internal use and cannot be overwritten; they return
a 1 when read.
Configuration Register Format
BIT 7
—
BIT 6
—
BIT 5
—
BIT 4
—
BIT 3
AD3
BIT 2
AD2
BIT 1
AD1
BIT 0
AD0
Note: Bits [3:0] are programmed through the four location programming address pins, AD[3:0]. Reading the configuration register
provides location information on up to 16 individual devices.
Table 2. Temperature Data Format
Cold-Junction-Compensated Thermocouple Temperature Data (Bytes 0 and 1)
BIT
7
6
5
4
3
LSByte (Scratchpad
Byte 0)
23
22
21
20
2-1
2
1
0
2-2
Reserved 1 = Fault
BIT
15
14
13
12
11
10
9
8
MSByte (Scratchpad
Byte 1)
Sign
210
29
28
27
26
25
24
Internal (Cold-Junction) Temperature Data (Bytes 2 and 3)
BIT
7
6
5
4
3
2
1
0
LSByte (Scratchpad
Byte 2)
2-1
2-2
2-3
2-4
Reserved
1 = Short
to VDD
1 = Short
to GND
1 = Open
Circuit
BIT
15
14
13
12
11
10
9
8
MSByte (Scratchpad
Byte 3)
Sign
26
25
24
23
22
21
20
Table 3. 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
Maxim Integrated
Table 4. Internal (Cold-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
13
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