LM75AIMMSLASHNOPB datasheet(8/21 Pages) TI1

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LM75A

SNOS808O – JANUARY 2000 – REVISED MAY 2013

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These interrupt mode resets of O.S. occur only when LM75A is read or placed in shutdown. Otherwise, O.S. would

remain active indefinitely for any event.

Figure 8. O.S. Output Temperature Response Diagram

TEMPERATURE DATA FORMAT

Temperature data can be read from the Temperature, TOS Set Point, and THYST Set Point registers; and written to

the TOS 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:

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 I2C bus. Shutdown

mode reduces power supply current significantly. See specified quiescent current specification in the electrical

tables. In Interrupt mode O.S. is reset if previously set and is undefined in Comparator mode during shutdown.

The I2C interface remains active. Activity on the clock and data lines of the I2C bus may slightly increase

shutdown mode quiescent current. TOS, THYST, and Configuration registers can be read from and written to in

shutdown mode.

For the LM75A, 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 LM75A 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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