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LM75 Datasheet(PDF) 7 Page - National Semiconductor (TI) |
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LM75 Datasheet(HTML) 7 Page - National Semiconductor (TI) |
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7 / 18 page  Typical Performance Characteristics Static Quiescent Current vs Temperature Dynamic Quiescent Current vs Temperature 01265816 01265817 Accuracy vs Temperature 01265818 1.0 Functional Description The LM75 temperature sensor incorporates a band-gap type temperature sensor and 9-bit ADC (Delta-Sigma Analog-to- Digital Converter). The temperature data output of the LM75 is available at all times via the I 2C bus. If a conversion is in progress, it will be stopped and restarted after the read. A digital comparator is also incorporated that compares a se- ries of readings, the number of which is user-selectable, to user-programmable setpoint and hysteresis values. The comparator trips the O.S. output line, which is programmable for mode and polarity. The LM75B contains all the functionality of the LM75C, plus two additional features: 1. The LM75B has an integrated low-pass filter on both the SDA and the SCL line. These filters increase communi- cations reliability in noisy environments. 2. The LM75B also has a bus fault timeout feature. If the SDA line is held low for longer than t TIMEOUT (75 ms minimum to 325 ms maximum) the LM75B will reset to the IDLE state (SDA set to high impedance) and wait for a new start condition. 1.1 O.S. OUTPUT, T OS AND THYST LIMITS In Comparator mode the O.S. Output behaves like a ther- mostat. The output becomes active when temperature ex- ceeds the T OS limit, and leaves the active state when the temperature drops below the T HYST limit. In this mode the O.S. output can be used to turn a cooling fan on, initiate an emergency system shutdown, or reduce system clock speed. Shutdown mode does not reset O.S. state in a com- parator mode. In Interrupt mode exceeding T OS also makes O.S. active but O.S. will remain active indefinitely until reset by reading any register via the I 2C interface. Once O.S. has been activated by crossing T OS, then reset, it can be activated again only by Temperature going below T HYST. Again, it will remain active indefinitely until being reset by a read. Placing the LM75 in shutdown mode also resets the O.S. Output. 1.2 POWER UP AND POWER DOWN The LM75 always powers up in a known state. The power up default conditions are: 1. Comparator mode 2. T OS = 80˚C 3. T HYST = 75˚C 4. O.S. active low 5. Pointer = “00” If the LM75 is not connected to the I 2C bus on power up, it will act as a stand-alone thermostat with the above tempera- ture settings. When the supply voltage is less than about 1.7V, the LM75 is considered powered down. As the supply voltage rises www.national.com 7 |
Similar Part No. - LM75_05 |
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Similar Description - LM75_05 |
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