1 Features
1• Qualified for Automotive Applications
• AEC-Q100 Qualified With the Following Results
– LM73-Q1 Temperature grade 1: –40°C to
125°C
– LM73-Q1 HBM ESD Classification Level 2
– LM73-Q1 CDM ESD Classification Level C6
• 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
• Temperature Accuracy: ±1.45°C (Maximum)
• Temperature Range: –40°C to 125°C
• Conversion Time
– 11-Bit (0.25°C): 14 ms (Maximum)
– 14-Bit (0.03125°C): 112 ms (Maximum)
• Operating Supply Current: 320 μA (Typical)
• Shutdown Supply Current: 1.9 μA (Typical)
• Resolution: 0.25°C to 0.03125°C

2 Applications
• Automotive Climate Control
• Advanced Driver Assistance Systems (ADAS)
• Airflow Sensor
• Infotainment Processor Management
• Instrument Cluster Control
• UREA Sensors
• HID Lamps

3 Description
The LM73-Q1 is a digital output temperature sensor
featuring an integrated incremental Delta-Sigma
ADC. The LM73-Q1 communicates with a two-wire
interface that is compatible with SMBus and I2C
interfaces, and the host can query the LM73-Q1 at
any time to read temperature.
The LM73-Q1 operates over a wide temperature
range (–40°C to 125°C) and provides ±1.45°C
accuracy from –10°C to 80°C. The LM73-Q1 includes
four selectable resolution options that allow the
temperature conversion time and sensitivity to be
adjusted for optimal performance. The LM73-Q1
defaults to 11-bit mode (0.25°C/LSB), and will
measure temperature in a maximum time of 14 ms,
making it ideal for applications that require
temperature data very soon after power-up. In its 14-
bit maximum resolution mode (0.03125°C/LSB), the
LM73-Q1 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, the LM73-Q1 has a
time-out feature that will automatically reset the clock
and data lines, if these lines are held low for an
extended period of time. This prevents a bus lock-up
condition without requiring host processor
intervention.