Overview
The LM75A, evaluated through the LM75AEVM evaluation module, is a digital temperature sensor and thermal watchdog produced by Texas Instruments. This device incorporates a band-gap type temperature sensor and a 9-bit delta-sigma analog-to-digital converter (ADC). It features an I2C-compatible 2-wire serial interface, allowing for easy communication and temperature data retrieval. The LM75A is designed to provide accurate temperature readings and includes a digital overtemperature detector with programmable limits and hysteresis. This makes it ideal for various applications requiring thermal management and protection.
Key Specifications
| Parameter | Min | Typical | Max | Unit |
|---|---|---|---|---|
| Supply Voltage | 2.7 | - | 5.5 | V |
| Operating Supply Current | - | 280 μA | - | μA |
| Shutdown Supply Current | - | 4 μA | - | μA |
| Temperature Accuracy (-25°C to 100°C) | - | ±2°C | - | °C |
| Temperature Accuracy (-55°C to 125°C) | - | ±3°C | - | °C |
| I2C Bus Frequency | - | - | 400 kHz | kHz |
| OS Output Saturation Voltage | 0.8 | - | - | V |
Key Features
- I2C-compatible 2-wire serial interface for communication.
- 9-bit delta-sigma ADC for accurate temperature measurements.
- Integrated digital overtemperature detector with programmable limits and hysteresis.
- Shutdown mode to minimize power consumption.
- Up to eight LM75A devices can be connected to a single bus.
- Power-up defaults permit stand-alone operation as a thermostat.
- Internal low-pass filters on SDA and SCL lines for improved communication reliability in noisy environments.
- Available in SOIC-8 and VSSOP-8 packages.
Applications
- Thermal system management and protection.
- Base stations.
- Electronic test equipment.
- Office electronics.
- Personal computers.
- Any system where thermal management is critical to performance.
Q & A
- What is the LM75A?
The LM75A is a digital temperature sensor and thermal watchdog produced by Texas Instruments, featuring a band-gap type temperature sensor and a 9-bit delta-sigma ADC.
- What is the supply voltage range for the LM75A?
The LM75A operates with a single supply from 2.7 V to 5.5 V.
- How does the LM75A communicate?
The LM75A communicates via an I2C-compatible 2-wire serial interface.
- What is the temperature accuracy of the LM75A?
The temperature accuracy is ±2°C from -25°C to 100°C and ±3°C from -55°C to 125°C.
- Can multiple LM75A devices be connected to the same bus?
Yes, up to eight LM75A devices can be connected to a single bus.
- What is the purpose of the OS output?
The OS output is an open-drain output that asserts when the temperature rises above the programmable limit, operating in either comparator or interrupt mode.
- What are the power consumption characteristics of the LM75A?
The LM75A has a typical operating supply current of 280 μA and a shutdown supply current of 4 μA.
- What packages is the LM75A available in?
The LM75A is available in SOIC-8 and VSSOP-8 packages.
- What are some common applications of the LM75A?
Common applications include thermal system management, base stations, electronic test equipment, office electronics, and personal computers.
- Does the LM75A have any noise filtering capabilities?
Yes, the LM75A has integrated low-pass filters on both the SDA and SCL lines to increase communication reliability in noisy environments.
