Overview
The LM75AD,112, produced by NXP USA Inc., is a digital temperature sensor and thermal watchdog. It utilizes an on-chip band gap temperature sensor and Sigma-delta A-to-D conversion technique to provide accurate temperature measurements. The device is designed to monitor ambient temperature and can operate as a stand-alone thermostat. It features programmable temperature threshold and hysteresis set points, making it versatile for various thermal management applications.
Key Specifications
| Specification | Value |
|---|---|
| Temperature Accuracy | ±2 °C from −25 °C to +100 °C, ±3 °C from −55 °C to +125 °C |
| Temperature Resolution | 0.125 °C |
| Supply Current (Shutdown Mode) | 3.5 µA |
| Communication Interface | I2C-bus serial bidirectional data line |
| ESD Protection | 2000 V HBM, 200 V MM, 1000 V CDM |
| Latch-up Testing | JEDEC Standard JESD78 (exceeds 100 mA) |
| Address Pins | Three selectable logic address pins |
| OS Output | Open-drain, programmable active state (HIGH or LOW) |
Key Features
- High temperature resolution of 0.125 °C
- Programmable temperature threshold and hysteresis set points
- Low power consumption with 3.5 µA in shutdown mode
- Stand-alone operation as thermostat at power-up
- ESD protection and latch-up testing compliance
- I2C-bus serial interface for communication
- Open-drain overtemperature shutdown output with programmable active state
Applications
- System thermal management
- Personal computers
- Electronics equipment
- Industrial controllers
Q & A
- What is the temperature accuracy of the LM75AD,112? The temperature accuracy is ±2 °C from −25 °C to +100 °C and ±3 °C from −55 °C to +125 °C.
- What is the temperature resolution of the LM75AD,112? The temperature resolution is 0.125 °C.
- How does the LM75AD,112 communicate with other devices? It uses an I2C-bus serial bidirectional data line.
- What is the supply current in shutdown mode? The supply current in shutdown mode is 3.5 µA.
- Does the LM75AD,112 have ESD protection? Yes, it exceeds 2000 V HBM, 200 V MM, and 1000 V CDM.
- Can the LM75AD,112 operate as a thermostat? Yes, it can operate as a stand-alone thermostat at power-up.
- How many devices can be connected on the same I2C bus without address conflict? Up to eight devices can be connected using the three selectable logic address pins.
- What is the function of the OS output? The OS output is an open-drain overtemperature shutdown output that becomes active when the temperature exceeds the programmed limits.
- Can the active state of the OS output be programmed? Yes, the active state of the OS output can be programmed as either HIGH or LOW.
- What are some common applications of the LM75AD,112? Common applications include system thermal management, personal computers, electronics equipment, and industrial controllers.
