TI LM73C0QDDCRQ1

The LM73-Q1 is a digital output temperature sensor with an integrated incremental Δ-Σ ADC. The LM73-Q1 communicates via a two-wire SMBus- and I²C-compatible interface, allowing the host to query the LM73-Q1 at any time to read temperature.

The LM73-Q1 operates over a wide temperature range (-40°C to 125°C) with ±1.45°C accuracy over the -10°C to 80°C range. Four selectable resolution options allow adjustment of temperature conversion time and sensitivity for optimized performance. The LM73-Q1 defaults to 11-bit mode (0.25°C/LSB), capable of measuring temperature within a maximum of 14ms — ideal for applications requiring rapid temperature data acquisition after power-up. In the highest-resolution 14-bit mode (0.03125°C/LSB), the LM73-Q1 is optimized to sense very small temperature changes.

Any one of three unique device addresses can be selected via a single multi-level address pin. An open-drain ALERT output activates when temperature exceeds a programmable limit. Both data and clock lines are filtered for superior noise immunity and reliable communication. Additionally, the LM73-Q1 features a timeout function that automatically resets the clock and data lines if they remain low for an extended period, preventing bus lockup conditions without requiring host processor intervention.

• Qualified for automotive applications with the following results per AEC-Q100
• LM73-Q1 temperature grade 1: -40℃ to 125℃
• LM73-Q1 exceeds human body model (HBM) ESD classification level 2
• LM73-Q1 charged device model (CDM) ESD classification level C6
• One address pin selects any of three optional addresses per version, with 6 total available addresses
• SMBus and I²C compatible 2-wire interface supporting 400kHz operation
• Shutdown mode with one-shot trigger for ultra-low average power consumption
• Programmable digital temperature resolution from 11-bit to 14-bit
• Fast conversion rate for rapid power-up and fast-charge temperature measurement
• Open-drain ALERT output pin activates when temperature exceeds programmed temperature limit
• Very stable, low-noise digital output
• UL recognized device
• Temperature accuracy: ±1.45℃ (maximum)
• Temperature range: -40℃ to 125℃
• Conversion time: 11-bit (0.25℃): 14ms (maximum); 14-bit (0.03125℃): 112ms (maximum)
• Operating supply current: 320μA (typical)
• Shutdown supply current: 1.9μA (typical)
• Resolution: 0.25℃ to 0.03125℃

• Automotive air conditioning
• Advanced Driver Assistance Systems (ADAS)
• Air flow sensor
• Infotainment processor management
• Instrument cluster system
• UREA sensor
• HID lighting