Overview
The LM73-Q1, specifically the LM73C0QDDCRQ1, is a digital output temperature sensor produced by Texas Instruments. This device features an integrated incremental Delta-Sigma analog-to-digital converter (ADC) and communicates through a two-wire interface compatible with SMBus and I2C. It operates over a wide temperature range of –40°C to 125°C and provides high accuracy, with ±1.45°C accuracy from –10°C to 80°C. The sensor is designed for applications requiring quick and precise temperature data, with a maximum conversion time of 14 ms in its default 11-bit mode.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Operating Voltage (VDD) | 2.7 | - | 5.5 | V |
| Temperature Range | –40 | - | 125 | °C |
| Accuracy (–10°C to 80°C) | –1.45 | - | 1.45 | °C |
| Resolution Options | 11-bit (0.25°C/LSB) | - | 14-bit (0.03125°C/LSB) | - |
| Conversion Time (11-bit mode) | - | - | 14 ms | - |
| Package Type | - | - | SOT-23 | - |
| Body Size | - | - | 2.90 mm × 1.60 mm | - |
| ESD Classification (HBM) | - | - | Level 2 | - |
| ESD Classification (CDM) | - | - | Level C6 | - |
Key Features
- Qualified for automotive applications with AEC-Q100 certification.
- Wide operating temperature range: –40°C to 125°C.
- Programmable resolution: 11-bit to 14-bit, allowing for adjustable conversion time and sensitivity.
- Two-wire interface compatible with SMBus 2.0 and I2C.
- Single address pin offering choice of three unique device addresses.
- Open-drain ALERT output for over-temperature indication.
- Integrated low-pass filters on SMBCLK and SMBDAT lines for noise tolerance.
- Time-out feature to prevent bus lock-up without host processor intervention.
- One-shot conversion mode for low-power applications.
- Shutdown mode to minimize power consumption.
Applications
- Automotive systems requiring precise temperature monitoring.
- Industrial control systems.
- Medical devices needing accurate temperature sensing.
- Consumer electronics requiring low-power temperature monitoring.
- HID lamps and UREA sensors.
Q & A
- What is the operating voltage range of the LM73-Q1?
The LM73-Q1 operates within a voltage range of 2.7V to 5.5V.
- What is the temperature accuracy of the LM73-Q1?
The LM73-Q1 provides ±1.45°C accuracy from –10°C to 80°C.
- What are the resolution options for the LM73-Q1?
The LM73-Q1 offers programmable resolution from 11-bit (0.25°C/LSB) to 14-bit (0.03125°C/LSB).
- How long does the LM73-Q1 take to convert temperature in its default mode?
In its default 11-bit mode, the LM73-Q1 takes a maximum of 14 ms to convert temperature.
- What is the purpose of the ALERT output on the LM73-Q1?
The ALERT output is an over-temperature indicator that goes active when the measured temperature exceeds a programmable limit.
- How does the LM73-Q1 prevent bus lock-up?
The LM73-Q1 has a time-out feature that resets the clock and data lines if they are held low for an extended period, preventing bus lock-up without requiring host processor intervention.
- What is the one-shot conversion mode in the LM73-Q1?
The one-shot conversion mode allows the LM73-Q1 to perform a single temperature conversion and update the Temperature Register while in shutdown mode, enabling low-power operation.
- What type of interface does the LM73-Q1 use for communication?
The LM73-Q1 uses a two-wire interface compatible with SMBus 2.0 and I2C.
- How many unique device addresses can the LM73-Q1 be configured for?
The LM73-Q1 can be configured for one of three unique device addresses, with two versions available, resulting in a total of six unique addresses.
- What is the package type of the LM73C0QDDCRQ1?
The LM73C0QDDCRQ1 is packaged in a SOT-23 package.
