LM70 SPI/MICROWIRE
™
10-Bit plus Sign Digital Temperature Sensor
February 2006
LM70
SPI/MICROWIRE 10-Bit plus Sign Digital Temperature
Sensor
General Description
The LM70 is a temperature sensor, Delta-Sigma analog-to-
digital converter with an SPI and MICROWIRE compatible
interface available in LLP and MSOP 8-pin packages. The
host can query the LM70 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 LM70 has 10-bit plus sign temperature resolution
(0.25˚C per LSB) while operating over a temperature range
of −55˚C to +150˚C.
The LM70’s 2.65V 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, elec-
tronic test equipment, and office electronics.
Features
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0.25˚C temperature resolution.
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Shutdown mode conserves power between temperature
reading
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SPI and MICROWIRE Bus interface
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MSOP-8 and LLP-8 packages save space
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UL Recognized Component
Key Specifications
j
Supply Voltage
j
Supply Current
2.65V to 5.5V
operating
shutdown
260 µA (typ)
490 µA (max)
12 µA (typ)
j
Temperature
−40˚C to 85˚C
−10˚C to 65˚C
−55˚C to 125˚C
−55˚C to 150˚C
±
2˚C(max)
+1.5/−2˚C(max)
+3/−2˚C(max)
+3.5/−2˚C(max)
Applications
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n
n
n
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System Thermal Management
Personal Computers
Disk Drives
Office Electronics
Electronic Test Equipment
Accuracy
Simplified Block Diagram
10122301
© 2006 National Semiconductor Corporation
DS101223
www.national.com
NSC [ NATIONAL SEMICONDUCTOR ]
