LM73 Datasheet | National Semiconductor

Description The LM73 is an integrated, digital-output temperature sensor featuring an incremental Delta-Sigma ADC with a two-wire interface that is patible with the SMBus and I2C ® interfaces. The host can query the LM73 at any time to read temperature. Available in a 6-pin SOT-23 package, the LM73 occupies very little board area while operating over a wide temperature range (-40˚C to 150˚C) and providing ± 1.0˚C accuracy from -10˚C to 80˚C. The user can optimize between the conversion time and the sensitivity of the LM73 by programming it to report temperature in any of four different resolutions. Defaulting to 11-bit mode (0.25˚C/LSB), the LM73 measures temperature in a maximum time of 14 ms, making it ideal for applications that require temperature data very soon after power-up. In its maximum resolution, 14-bit mode (0.03125˚C/LSB), the LM73 is optimized to sense very small changes in temperature. A single multi-level address line selects one of three unique device addresses. An open-drain ALERT output goes active when the temperature exceeds a programmable limit. Both the data and clock lines are filtered for excellent noise tolerance and reliable munication. Additionally, a time-out feature on the clock and data lines causes the LM73 to automatically reset these lines if either is held low for an extended time, thus exiting any bus lock-up condition without processor intervention. Key Specifications j Supply Voltage j Supply Current 2.7V to 5.5V operating shutdown 320 µA (typ) 495 µA (max) 8 µA (max) 1.9 µA (typ) j Temperature - 10˚C to 80˚C - 25˚C to 115˚C - 40˚C to 150˚C Accuracy j Resolution j Conversion Time ± 1.0˚C (max) ± 1.5˚C (max) ± 2.0˚C (max) 0.25˚C to 0.03125˚C 11-bit (0.25˚C) 14-bit (0.03125˚C) 14 ms (max) 112 ms (max) Features n Single address pin offers choice of three selectable addresses per version for a total of six possible addresses. n SMBus and I2C-patible two-wire interface n Supports 400 k Hz operation n Shutdown mode with...