SPI/MICROWIRE™ 10-Bit plus Sign Digital Temperature
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 pack-
ages. The host can query the LM70 at any time to read tem-
perature. 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.
n System Thermal Management
n Personal Computers
n Disk Drives
n Office Electronics
n Electronic Test Equipment
n 0.25˚C temperature resolution.
n Shutdown mode conserves power between temperature
n SPI and MICROWIRE Bus interface
n MSOP-8 and LLP-8 packages save space
j Supply Voltage
j Supply Current
−40˚C to 85˚C
−10˚C to 65˚C
−55˚C to 125˚C
−55˚C to 150˚C
2.65V to 5.5V
Simplified Block Diagram
MICROWIRE® is a registered trademark of National Semiconductor Corporation.
© 2000 National Semiconductor Corporation DS101223