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LM95235 Datasheet(PDF) 11 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
Part # LM95235
Description  Precision Remote Diode Temperature Sensor with SMBus Interface and TruTherm Technology
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM95235 Datasheet(HTML) 11 Page - National Semiconductor (TI)

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1.0 Functional Description (Continued)
1.5 TEMPERATURE DATA FORMAT
Temperature data can only be read from the Local and
Remote Temperature registers.
Remote temperature data with the digital filter off is repre-
sented by an 10-bit plus sign, two’s complement word and
11-bit unsigned binary word with an LSb (Least Significant
Bit) equal to 0.125˚C. The data format is a left justified 16-bit
word available in two 8-bit registers. Unused bits report "0".
Remote temperature data with the digital filter on is repre-
sented by a 12-bit plus sign, two’s complement word and
13-bit unsigned binary word with an LSb (Least Significant
Bit) equal to 0.03125˚C (1/32˚C). The data format is a left
justified 16-bit word available in two 8-bit registers. Unused
bits report "0".
11-bit, 2’s complement (10-bit plus sign)
Temperature
Digital Output
Binary
Hex
+125˚C
0111 1101 0000 0000
7D00h
+25˚C
0001 1001 0000 0000
1900h
+1˚C
0000 0001 0000 0000
0100h
+0.125˚C
0000 0000 0010 0000
0020h
0˚C
0000 0000 0000 0000
0000h
−0.125˚C
1111 1111 1110 0000
FFE0h
−1˚C
1111 1111 0000 0000
FF00h
−25˚C
1110 0111 0000 0000
E700h
−55˚C
1100 1001 0000 0000
C900h
11-bit, unsigned binary
Temperature
Digital Output
Binary
Hex
+255.875˚C
1111 1111 1110 0000
FFE0h
+255˚C
1111 1111 0000 0000
FF00h
+201˚C
1100 1001 0000 0000
C900h
+125˚C
0111 1101 0000 0000
7D00h
Temperature
Digital Output
Binary
Hex
+25˚C
0001 1001 0000 0000
1900h
+1˚C
0000 0001 0000 0000
0100h
+0.125˚C
0000 0000 0010 0000
0020h
0˚C
0000 0000 0000 0000
0000h
13-bit, 2’s complement (12-bit plus sign)
Temperature
Digital Output
Binary
Hex
+125˚C
0111 1101 0000 0000
7D00h
+25˚C
0001 1001 0000 0000
1900h
+1˚C
0000 0001 0000 0000
0100h
+0.03125˚C
0000 0000 0000 1000
0008h
0˚C
0000 0000 0000 0000
0000h
−0.03125˚C
1111 1111 1111 1000
FFF8h
−1˚C
1111 1111 0000 0000
FF00h
−25˚C
1110 0111 0000 0000
E700h
−55˚C
1100 1001 0000 0000
C900h
13-bit, unsigned binary
Temperature
Digital Output
Binary
Hex
+255.875˚C
1111 1111 1110 0000
FFE0h
+255˚C
1111 1111 0000 0000
FF00h
+201˚C
1100 1001 0000 0000
C900h
+125˚C
0111 1101 0000 0000
7D00h
+25˚C
0001 1001 0000 0000
1900h
+1˚C
0000 0001 0000 0000
0100h
+0.03125˚C
0000 0000 0000 1000
0008h
0˚C
0000 0000 0000 0000
0000h
Local Temperature data is represented by a 10-bit plus sign,
two’s complement word with an LSb (Least Significant Bit)
equal to 0.125˚C. The data format is a left justified 16-bit
word available in two 8-bit registers. Unused bits will always
report
"0".
Local
temperature
readings
greater
than
+127.875˚C are clamped to +127.875˚C, they will not roll-
over to negative temperature readings.
11-bit, 2’s complement (10-bit plus sign)
Temperature
Digital Output
Binary
Hex
+125˚C
0111 1101 0000 0000
7D00h
+25˚C
0001 1001 0000 0000
1900h
+1˚C
0000 0001 0000 0000
0100h
+0.125˚C
0000 0000 0010 0000
0020h
0˚C
0000 0000 0000 0000
0000h
−0.125˚C
1111 1111 1110 0000
FFE0h
−1˚C
1111 1111 0000 0000
FF00h
−25˚C
1110 0111 0000 0000
E700h
−55˚C
1100 1001 0000 0000
C900h
20174927
FIGURE 3. Digital Filter Response in a typical Intel
processor on a 65 nm or 90 nm process. The filter
curves were purposely offset for clarity.
www.national.com
11


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