1 Features
1• Single Address Pin Offers Choice of Three
Selectable Addresses Per Version for a Total of
Six Possible Addresses.
• SMBus and I2C-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 Output
• UL Recognized Component
• Key Specifications
– Supply Current
– Operating
– 320 μA (Typical)
– 495 μA (Maximum)
– Shutdown
– 8 μA (Maximum)
– 1.9 μA (Typical)
– Temperature Accuracy
– −10°C to 80°C: ±1.0°C (Maximum)
– −25°C to 115°C: ±1.5°C (Maximum)
– −40°C to 150°C: ±2°C (Maximum)
– Resolution
– 0.25°C to 0.03125°C
– Conversion Time
– 11-Bit (0.25°C): 14 ms (Maximum)
– 14-Bit (0.03125°C): 112 ms (Maximum)

2 Applications
• Portable Electronics
• Notebook Computers
• Automotive
• System Thermal Management
• Office Electronics

3 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 I2C interfaces. The host can query the
LM73 at any time to read temperature.
Available in a 6-pin SOT package, the LM73 occupies
very little board area while operating over a wide
temperature range (–40°C to 150°C) and providing
±1°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.