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.