Features • Single address pin offers choice of three selectable addresses per version for a total of six possible addresses. • SMBus and I 2C-compatible two-wire interface • Supports 400 kHz operation • Shutdown mode with one-shot feature available for very low average power consumption • Programmable digital temperature resolution from 11 bits to 14 bits. • Fast conversion rate ideal for quick power up and measuring rapidly changing temperature • Open-drain ^ALERT output pin goes active when temperature is above a programmed temperature limit • Very stable, low-noise digital ouput. • UL Recognized Component 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® 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 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. Key Specification ■  Supply Voltage 2.7V to 5.5V ■  Supply Current operating 320 µA (typ) 495 µA (max) shutdown 8 µA (max)     1.9 µA (typ) ■  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) ■  Resolution   0.25°C to 0.03125°C ■  Conversion Time 11-bit (0.25°C) 14 ms (max) 14-bit (0.03125°C) 112 ms (max) Applications • Portable Electronics • Notebook Computers • Automotive • System Thermal Management • Office Electronics

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Datasheet

Title		Size	Date	Other Language
	LM73 2.7V, SOT-23, 11-to-14 Bit Digital Temperature Sensor with 2-Wire Interface	442 Kbytes	13-May-09

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Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LM73CIMK-0	CMOS7	0	18406	0	0	1089000	4	309006723
LM73CIMK-1	CMOS7	0	18406	0	0	1089000	4	309006723
LM73CIMKX-0	CMOS7	0	18406	0	0	1089000	4	309006723
LM73CIMKX-1	CMOS7	0	18406	0	0	1089000	4	309006723

Note: The Early Failure Rates (EFR) were calculated as point estimate PPM based on rejects and sample size for EFR. The Long Term Failure Rates were calculated at 60% confidence using the Arrhenius equation at 0.7eV activation energy and derating the assumed stress temperature of 150°C to an application temperature of 55°C.

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