±1.25°C Temperature Sensor with SPI Interface - LM74

LM74 (ACTIVE)

±1.25°C Temperature Sensor with SPI Interface

Description

The LM74 is a temperature sensor, Delta-Sigma analog-to-digital converter with an SPI and MICROWIRE compatible interface. The host can query the LM74 at any time to read temperature. A shutdown mode decreases power consumption to less than 10 μA. This mode is useful in systems where low average power consumption is critical.

The LM74 has 12-bit plus sign temperature resolution (0.0625°C per LSB) while operating over a temperature range of −55°C to +150°C.

The LM74's 3.0V to 5.5V supply voltage range, low supply current and simple SPI interface make it ideal for a wide range of applications. These include thermal management and protection applications in hard disk drives, printers, electronic test equipment, and office electronics. The LM74 is available in the SOIC package as well as the 5-Bump DSBGA package.

Features

  • 0.0625°C Temperature Resolution
  • Shutdown Mode Conserves Power Between Temperature Reading
  • SPI and MICROWIRE Bus Interface
  • 5-Bump DSBGA Package Saves Space

Key Specifications

  • Supply Voltage 3.0V or 2.65V to 5.5V
  • Supply Current
    • Operating265μA (typ)520μA (max)
    • Shutdown3μA (typ)
  • Temperature Accuracy
    • −10°C to 65°C, ±1.25°C(max)
    • −25°C to 110°C, ±2.1°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 Resolution (Max) (bits)
Supply Voltage (Min) (V)
Supply Voltage (Max) (V)
Supply Current (Typ) (uA)
Supply Current (Max) (uA)
Interface
Special Features
Addresses
Iq (Typ) (uA)
Rating
Operating Temperature Range (C)
Pin/Package
Approx. Price (US$)
LM74 LM70 LM74A
1.25     2     3    
13     11     13    
2.65
3    
2.65     3
4.5    
5.5     5.5     5.5
3.6    
265     260     310    
470     490     520    
SPI, Microwire     SPI, Microwire     SPI, Microwire    
Shutdown Power Mode     Shutdown Power Mode     Shutdown Power Mode    
NA     NA     NA    
265     260     310    
Catalog     Catalog     Catalog    
-40 to 125
-55 to 150    
-55 to 150      
5DSBGA
8SOIC    
8VSSOP
8WSON    
 
0.65 | 1ku     0.75 | 1ku      

Related end equipment

  • System Thermal Management
  • Personal Computers
  • Disk Drives
  • Office Electronics
  • Electronic Test Equipment

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