Overview
The LM75A, specifically the LM75AIMMX/NOPB model from Texas Instruments, is an industry-standard digital temperature sensor. It features an integrated sigma-delta analog-to-digital converter (ADC) and an I2C interface. This device is designed to provide accurate temperature measurements and includes a thermal watchdog with programmable overtemperature limits and hysteresis. The LM75A is available in SOIC-8 and VSSOP-8 packages, making it versatile for various applications requiring precise thermal management.
Key Specifications
| Parameter | Value | Conditions |
|---|---|---|
| Supply Voltage | 2.7 to 5.5 Vdc | |
| Operating Supply Current | 280 μA (Typical) | T_A = 25°C |
| Shutdown Supply Current | 4 μA (Typical) | T_A = 25°C |
| Temperature Accuracy | ±2°C (Max) from -25°C to 100°C, ±3°C (Max) from -55°C to 125°C | |
| I2C Bus Frequency | Up to 400 kHz | |
| Slave Address | 7-bit, with 4 MSB hardwired as '1001' and 3 LSB set by A2-A0 pins | |
| Package Types | SOIC-8, VSSOP-8 |
Key Features
- Digital temperature sensor with integrated sigma-delta ADC and I2C interface.
- Programmable overtemperature output with fault tolerance and hysteresis.
- Shutdown mode to minimize power consumption.
- Fault queue of up to 6 faults to prevent false tripping of the overtemperature output.
- Wide temperature range: -55°C to 125°C.
- Support for I2C bus with up to 400 kHz frequency).
Applications
- Base stations
- Electronic test equipment
- Office electronics
- Personal computers
- General system thermal management in any system where thermal performance is critical).
Q & A
- What is the LM75A?
The LM75A is a digital temperature sensor with an integrated sigma-delta ADC and I2C interface, designed for precise temperature measurement and thermal management.
- What are the package options for the LM75A?
The LM75A is available in SOIC-8 and VSSOP-8 packages.
- What is the operating supply current of the LM75A?
The typical operating supply current is 280 μA at T_A = 25°C.
- What is the temperature accuracy of the LM75A?
The temperature accuracy is ±2°C (Max) from -25°C to 100°C and ±3°C (Max) from -55°C to 125°C.
- Can the overtemperature output be programmed?
- What is the purpose of the fault queue in the LM75A?
The fault queue prevents false tripping of the overtemperature output by allowing up to 6 consecutive error conditions before activation.
- What is the maximum I2C bus frequency supported by the LM75A?
The LM75A supports an I2C bus frequency of up to 400 kHz.
- How is the slave address of the LM75A set?
The 7-bit slave address has 4 MSB hardwired as '1001' and 3 LSB set by A2-A0 pins.
- What are some common applications of the LM75A?
- Is the LM75A suitable for new designs?
