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Digital Temperature Sensor and Thermal Watchdog with Two-Wire Interface
National Semiconductor
Description
The LM75 is a temperature sensor, Delta-Sigma analog-to-digital converter, and digital over-temperature detector with I2C® interface. The host can query the LM75 at any time to read temperature. The open-drain Overtemperature Shutdown (O.S.) output becomes active when the temperature exceeds a programmable limit. This pin can operate in either "Comparator" or "Interrupt" mode. The host can program both the temperature alarm threshold (TOS) and the temperature at which the alarm condition goes away (THYST). In addition, the host can read back the contents of the LM75's TOS and THYST registers. Three pins (A0, A1, A2) are available for address selection. The sensor powers up in Comparator mode with default thresholds of 80°C TOS and 75°C THYST. The LM75's 3.0V to 5.5V supply voltage range, low supply current and I2C interface make it ideal for a wide range of applications. These include thermal management and protection applications in personal computers, electronic test equipment, and office electronics.
Features
• SOP-8 and Mini SOP-8 (MSOP) packages save space
• I2C Bus interface
• Separate open-drain output pin operates as interrupt or comparator/thermostat output
• Register readback capability
• Power up defaults permit stand-alone operation as thermostat
• Shutdown mode to minimize power consumption
• Up to 8 LM75s can be connected to a single bus
• UL Recognized Component
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