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LM75BIMMX-5 データシート(PDF) 9 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
部品番号 LM75BIMMX-5
部品情報  Digital Temperature Sensor and Thermal Watchdog with Two-Wire Interface
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メーカー  NSC [National Semiconductor (TI)]
ホームページ  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM75BIMMX-5 データシート(HTML) 9 Page - National Semiconductor (TI)

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1.0 Functional Description (Continued)
1.4 TEMPERATURE DATA FORMAT
Temperature data can be read from the Temperature, T
OS
Set Point, and T
HYST Set Point registers; and written to the
T
OS Set Point, and THYST Set Point registers. Temperature
data is represented by a 9-bit, two’s complement word with
an LSB (Least Significant Bit) equal to 0.5˚C:
Temperature
Digital Output
Binary
Hex
+125˚C
0 1111 1010
0FAh
+25˚C
0 0011 0010
032h
+0.5˚C
0 0000 0001
001h
0˚C
0 0000 0000
000h
−0.5˚C
1 1111 1111
1FFh
−25˚C
1 1100 1110
1CEh
−55˚C
1 1001 0010
192h
1.5 SHUTDOWN MODE
Shutdown mode is enabled by setting the shutdown bit in the
Configuration register via the I
2C bus. Shutdown mode re-
duces power supply current to 4 µA typical. In Interrupt mode
O.S. is reset if previously set and is undefined in Comparator
mode during shutdown. The I
2C interface remains active.
Activity on the clock and data lines of the I
2C bus may
slightly increase shutdown mode quiescent current. T
OS,
T
HYST, and Configuration registers can be read from and
written to in shutdown mode.
1.6 FAULT QUEUE
A fault queue of up to 6 faults is provided to prevent false
tripping of O.S. when the LM75 is used in noisy environ-
ments. The number of faults set in the queue must occur
consecutively to set the O.S. output.
1.7 COMPARATOR/INTERRUPT MODE
As indicated in the O.S. Output Temperature Response Dia-
gram, Figure 4, the events that trigger O.S. are identical for
either Comparator or Interrupt mode. The most important
difference is that in Interrupt mode the O.S. will remain set
indefinitely once it has been set. To reset O.S. while in
Interrupt mode, perform a read from any register in the
LM75.
1.8 O.S. OUTPUT
The O.S. output is an open-drain output and does not have
an internal pull-up. A “high” level will not be observed on this
pin until pull-up current is provided from 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. This will minimize
any errors due to internal heating of the LM75. The maxi-
mum resistance of the pull up, based on LM75 specification
for High Level Output Current, to provide a 2V high level, is
30 k
Ω.
1.9 O.S. POLARITY
The O.S. output can be programmed via the configuration
register to be either active low (default mode), or active high.
In active low mode the O.S. output goes low when triggered
exactly as shown on the O.S. Output Temperature Response
Diagram, Figure 4. Active high simply inverts the polarity of
the O.S. output.
www.national.com
9


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