Digital Temperature Sensor and Thermal Watchdog with Two-Wire Interface - LM75A

LM75A (ACTIVE)

Digital Temperature Sensor and Thermal Watchdog with Two-Wire Interface

Description

The LM75A is an industry-standard digital temperature sensor with an integrated Sigma-Delta analog-to-digital converter and I2C interface. The LM75A provides 9-bit digital temperature readings with an accuracy of ±2°C from -25°C to 100°C and ±3°C over -55°C to 125°C.

The LM75A operates with a single supply from +2.7V to +5.5V. Communication is accomplished over a 2-wire interface which operates up to 400kHz. The LM75A has three address pins, allowing up to eight LM75A devices to operate on the same 2-wire bus. The LM75A has a dedicated over-temperature output (O.S.) with programmable limit and hysteresis. This output has programmable fault tolerance, which allows the user to define the number of consecutive error conditions that must occur before O.S. is activated. The wide temperature and supply range and I2C interface make the LM75A ideal for a number of applications including base stations, electronic test equipment, office electronics, personal computers, and any other system where thermal management is critical to performance. The LM75A is available in an SOIC-8 package and an VSSOP-8 package.

Features

  • No External Components Required
  • Shutdown Mode to Minimize Power Consumption
  • Up to Eight LM75As can be Connected to a Single Bus
  • Power Up Defaults Permit Stand-Alone Operation as Thermostat

Key Specifications

  • Supply Voltage
    • LM75A: 2.7V to 5.5V
  • Supply Current
    • Operating: 280 μA (Typ)
    • Shutdown: 4 μA (Typ)
  • Temperature Accuracy
    • 25°C to 100°C: ±2°C (Max)
    • 55°C to 125°C: ±3°C (Max)

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Parametrics Compare all products in Digital Output

 
Local Sensor Accuracy (Max) (+/- C)
Temp Range for Listed Accuracy (C)
Temp Resolution (Max) (bits)
Supply Current (Typ) (uA)
Supply Voltage (Min) (V)
Supply Voltage (Max) (V)
Interface
Programmable Alert
Shutdown
Special Features
Rating
Operating Temperature Range (C)
Pin/Package
Approx. Price (US$)
LM75A
2    
-25 to 100    
9    
280    
2.7    
5.5    
I2C    
Yes    
Yes    
Fault Queue
Thermal Watchdog    
Catalog    
-55 to 125    
8SOIC
8VSSOP    
0.45 | 1ku