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LM75 Datasheet(PDF) 9 Page - National Semiconductor (TI) |
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LM75 Datasheet(HTML) 9 Page - National Semiconductor (TI) |
9 / 18 page 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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