Rainbow Electronics LM71 - Manual

LM71
SPI/MICROWIRE 13-Bit Plus Sign Temperature Sensor
General Description
The LM71 is a low-power, high-resolution digital temperature
sensor with an SPI and MICROWIRE compatible interface,
available in the 5-pin SOT23 or the 6-pin LLP (no pull back)
package. The host can query the LM71 at any time to read
temperature. Its low operating current is useful in systems
where low power consumption is critical.
The LM71 has 13-bit plus sign temperature resolution
(0.03125˚C per LSB) while operating over a temperature
range of −40˚C to +150˚C.
The LM71’s 2.65V to 5.5V supply voltage range, fast con-
version rate, low supply current, and simple SPI interface
make it ideal for a wide range of applications.
Applications
n System Thermal Management
n Personal Computers
n Portable Electronic Devices
n Disk Drives
n Office Electronics
n Electronic Test Equipment
n Vending Machines
Features
n SOT23-5 or No-Pull-Back LLP-6 Packages
n Operates over a full −40˚C to +150˚C range
n SPI and MICROWIRE Bus interface
Key Specifications
j Supply Voltage 2.65V to 5.5V
j Supply Current operating 300 µA (typ)
550 µA (max)
j Temperature
Accuracy −10˚C to +65˚C ± 1.5˚C (max)
−40˚C to 150˚C +3/− 2˚C (max)
j Temperature
Resolution
31.25 m˚C
Simplified Block Diagram
20031701
TRI-STATE ® is a registered trademark of National Semiconductor Corporation.
February 2005
LM71
SPI/MICROWIRE
™
13-Bit
Plus
Sign
T
emperature
Sensor
© 2005 National Semiconductor Corporation DS200317 www.national.com