LM92_05 NSC [National Semiconductor], LM92_05 Datasheet - Page 9

• Manufacturer Part Number: LM92_05
• Manufacturer: NSC [National Semiconductor]

1.0 Functional Description
Therefore, the complete slave address is:
Note: Event Interrupt mode is drawn as if the user is reading the part. If the user doesn’t read, the outputs would go low and stay that way until the LM92 is read.
Comparator Interrupt Mode is drawn as if the user never reads the part. If the user does read, the outputs will go high once read instruction is executed and, if the
fault condition still exists, go low at the end of the next conversion.
1.4 TEMPERATURE DATA FORMAT
Temperature data can be read from the Temperature and Set
Point registers; and written to the Set Point registers. Tem-
perature data can be read at any time, although reading
faster than the conversion time of the LM92 will prevent data
from being updated. Temperature data is represented by a
13-bit, two’s complement word with an LSB (Least Signifi-
cant Bit) equal to 0.0625 ˚C:
Temperature
+0.0625 ˚C
1
+125 ˚C
+130˚C
+80 ˚C
+64 ˚C
+25 ˚C
+10 ˚C
+2 ˚C
0 ˚C
0
0
0 1000 0 010 0000
0 0101 0000 0000
0 0100 0000 0000
0 0001 1001 0000
0 0000 1010 0000
0 0000 0010 0000
0 0000 0000 0001
0 0111 1101 0000
00 0000 0000
Binary
1
Digital Output
0
FIGURE 3. Temperature Response Diagram
A1
(Continued)
07 D0h
00 A0h
08 20h
05 00h
04 00h
01 90h
00 20h
00 01h
00 00h
Hex
A0
9
1.5 SHUTDOWN MODE
Shutdown mode is enabled by setting the shutdown bit in the
Configuration register via the Serial Bus. Shutdown mode
reduces power supply current to 5 µA typical. T_CRIT_A is
reset if previously set. Since conversions are stoped during
shutdown, T_CRIT_A and INT will not be operational. The
Serial Bus interface remains active. Activity on the clock and
data lines of the Serial Bus may slightly increase shutdown
mode quiescent current. Registers can be read from and
written to in shutdown mode. The LM92 takes miliseconds to
respond to the shutdown command.
1.6 INT AND T_CRIT_A OUTPUT
The INT and T_CRIT_A outputs are open-drain outputs and
do not have internal pull-ups. A "high" level will not be
MSB
Temperature
−0.0625 ˚C
−25 ˚C
−55 ˚C
1 1100 1001 0000
1 1110 0111 0000
1 1111 1111 1111
Binary
Digital Output
10105106
1F FFh
1C 90h
1E 70h
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Hex
LSB