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LM95231BIMM Datasheet(PDF) 10 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part No. LM95231BIMM
Description  Precision Dual 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)

LM95231BIMM Datasheet(HTML) 10 Page - National Semiconductor (TI)

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1.0 Functional Description (Continued)
1.4 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 11-bit, two’s complement word or unsigned
binary word with an LSb (Least Significant Bit) equal to
0.125˚C. The data format is a left justified 16-bit word avail-
able in two 8-bit registers. Unused bits will always 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
+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
Remote temperature data with the digital filter on is repre-
sented by a 13-bit, two’s complement word or 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 will always
report "0".
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, two’s
complement word with an LSb (Least Significant Bit) equal to
0.25˚C. The data format is a left justified 16-bit word avail-
able 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.
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
+0.25˚C
0000 0000 0100 0000
0040h
0˚C
0000 0000 0000 0000
0000h
−0.25˚C
1111 1111 1100 0000
FFC0h
−1˚C
1111 1111 0000 0000
FF00h
−25˚C
1110 0111 0000 0000
E700h
−55˚C
1100 1001 0000 0000
C900h
1.5 SMBDAT OPEN-DRAIN OUTPUT
The SMBDAT output is an open-drain output and does not
have internal pull-ups. A “high” level will not be observed on
this pin until pull-up current is provided by some external
source, typically a pull-up resistor. Choice of resistor value
depends on many system factors but, in general, the pull-up
resistor should be as large as possible without effecting the
SMBus desired data rate. This will minimize any internal
temperature reading errors due to internal heating of the
LM95231. The maximum resistance of the pull-up to provide
a 2.1V high level, based on LM95231 specification for High
Level Output Current with the supply voltage at 3.0V, is 82k
(5%) or 88.7k
Ω (1%).
1.6 DIODE FAULT DETECTION
The LM95231 is equipped with operational circuitry designed
to detect fault conditions concerning the remote diodes. In
the event that the D+ pin is detected as shorted to GND, D−,
V
DD or D+ is floating, the Remote Temperature reading is
–128.000 ˚C if signed format is selected and +255.875 if
unsigned format is selected. In addition, the appropriate
status register bits RD1M or RD2M (D1 or D0) are set. When
TruTherm mode is active the condition of diode short of D+
to D− will not be detected. Connecting a 2N3904 transistor
with TruTherm mode active may cause a detection of a diode
fault.
www.national.com
10


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