SNIS107K – MAY 2000 – REVISED MARCH 2013
LM74 SPI/Microwire12-Bit Plus Sign Temperature Sensor
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FEATURES
0.0625°C Temperature Resolution
Shutdown Mode Conserves Power Between
Temperature Reading
SPI and MICROWIRE Bus Interface
5-Bump DSBGA Package Saves Space
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.
Block Diagram
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APPLICATIONS
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System Thermal Management
Personal Computers
Disk Drives
Office Electronics
Electronic Test Equipment
KEY SPECIFICATIONS
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Supply Voltage 3.0V or 2.65V to 5.5V
Supply Current
– Operating
– 265μA (typ)
– 520μA (max)
– Shutdown
– 3μA (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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Figure 1.
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Copyright © 2000–2013, Texas Instruments Incorporated
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
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