Datasheet

LM75B, LM75C
www.ti.com SNIS153B –JULY 2009–REVISED MARCH 2013
These interrupt mode resets of O.S. occur only when LM75 is read or placed in shutdown. Otherwise, O.S. would
remain active indefinitely for any event.
Figure 9. O.S. Output Temperature Response Diagram
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 T
HYST
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:
Digital Output
Temperature
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
SHUTDOWN MODE
Shutdown mode is enabled by setting the shutdown bit in the Configuration register via the I
2
C bus. Shutdown
mode reduces power supply current significantly. See specified quiescent current specification in the
Temperature-to-Digital Converter Characteristics table. In Interrupt mode O.S. is reset if previously set and is
undefined in Comparator mode during shutdown. The I
2
C interface remains active. Activity on the clock and data
lines of the I
2
C 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.
For the LM75B, the TIMEOUT feature is turned off in Shutdown Mode.
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
environments. The number of faults set in the queue must occur consecutively to set the O.S. output.
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