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LM76CHMX-5 Datasheet(PDF) 8 Page - National Semiconductor (TI) |
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LM76CHMX-5 Datasheet(HTML) 8 Page - National Semiconductor (TI) |
8 / 15 page 1.0 Functional Description (Continued) 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 LM76 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 Digital Output Binary Hex +130˚C 0 1000 0 010 0000 08 20h +125˚C 0 0111 1101 0000 07 D0h +80˚C 0 0101 1010 0000 05 90h +64˚C 0 0100 0000 0000 04 00h +25˚C 0 0001 1001 0000 01 90h +10˚C 0 0000 1010 0000 00 A0h +2˚C 0 0000 0010 0000 00 20h +0.0625˚C 0 0000 0000 0001 00 01h 0˚C 00 0000 0000 00 00h −0.0625˚C 1 1111 1111 1111 1F FFh −25˚C 1 1110 0111 0000 1E 70h −55˚C 1 1100 1001 0000 1C 90h 1.5 SHUTDOWN MODE Shutdown mode is enabled by setting the shutdown bit in the Configuration register via the Serial Bus. Shutdown mode re- duces power supply current to 5 µA typical. T_CRIT_A is re- set 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 LM76 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 ob- served on these pins 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 gen- eral, the pull-up resistor should be as large as possible. This will minimize any errors due to internal heating of the LM76. The maximum resistance of the pull up, based on LM76 specification for High Level Output Current, to provide a 2 volt high level, is 30K ohms. 1.7 FAULT QUEUE A fault queue of up to 4 faults is provided to prevent false tripping when the LM76 is used in noisy environments. The 4 faults must occur consecutively to set flags as well as INT DS101015-6 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 LM76 is read. FIGURE 3. Temperature Response Diagram www.national.com 8 |
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