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LM73CIMKX-0 Datasheet(PDF) 1 Page - National Semiconductor (TI) |
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LM73CIMKX-0 Datasheet(HTML) 1 Page - National Semiconductor (TI) |
1 / 18 page LM73 2.7V, SOT-23, 11-to-14 Bit Digital Temperature Sensor with 2-Wire Interface General Description The LM73 is an integrated, digital-output temperature sensor featuring an incremental Delta-Sigma ADC with a two-wire interface that is compatible with the SMBus and I 2C® inter- faces. 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 be- tween 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 toler- ance and reliable communication. 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. Applications n Portable Electronics n Notebook Computers n Automotive n System Thermal Management n Office Electronics Key Specifications j Supply Voltage 2.7V to 5.5V j Supply Current operating 320 µA (typ) 495 µA (max) shutdown 8 µA (max) 1.9 µA (typ) j Temperature −10˚C to 80˚C ±1.0˚C (max) Accuracy −25˚C to 115˚C ±1.5˚C (max) −40˚C to 150˚C ±2.0˚C (max) j Resolution 0.25˚C to 0.03125˚C j Conversion Time 11-bit (0.25˚C) 14 ms (max) 14-bit (0.03125˚C) 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 I 2C-compatible two-wire interface n Supports 400 kHz operation n Shutdown mode with one-shot feature available for very low average power consumption n Programmable digital temperature resolution from 11 bits to 14 bits. n Fast conversion rate ideal for quick power up and measuring rapidly changing temperature n Open-drain ALERT output pin goes active when temperature is above a programmed temperature limit n Very stable, low-noise digital ouput. n UL Recognized Component Typical Application 20147803 I2C is a registered trademark of Philips Electronics N.V. Corporation July 2006 © 2006 National Semiconductor Corporation DS201478 www.national.com |
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