±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 Local Digital Temperature Sensors

 
Interface
Local Sensor Accuracy (Max) (+/- C)
Temp Resolution (Max) (bits)
Operating Temperature Range (C)
Supply Voltage (Min) (V)
Supply Voltage (Max) (V)
Supply Current (Typ) (uA)
Supply Current (Max) (uA)
Special Features
Addresses
Rating
Package Group
Package Size: mm2:W x L (PKG)
Approx. Price (US$)
Iq (Typ) (uA)
LM74 LM70 LM74A
SPI, Microwire    SPI, Microwire    SPI, Microwire   
1.25    2    3   
13    11    13   
-40 to 125
-55 to 150   
-55 to 150    -40 to 125   
2.65
3   
2.65    3
4.5   
5.5    5.5    5.5
3.6   
265    260    310   
470    490    520   
Shutdown    Shutdown    Shutdown   
NA    NA    NA   
Catalog    Catalog    Catalog   
DSBGA
SOIC   
VSSOP
WSON   
DIESALE   
See datasheet (DSBGA)    See datasheet (WSON)     
0.65 | 1ku    0.75 | 1ku    0.65 | 1ku   
265    260    310   

Related end equipment

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

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