National Semiconductor LM71 Technical data
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LM71
LM71 SPI/MICROWIRE 13-Bit Plus Sign Temperature Sensor
March 2004
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 conversion 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
Simplified Block Diagram
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
−40˚C to 150˚C +3/− 2˚C (max)
j
Temperature
Resolution
1.5˚C (max)
31.25 m˚C
20031701
MICROWIRE™is a trademark of National Semiconductor Corporation.
®
TRI-STATE
© 2004 National Semiconductor Corporation DS200317 www.national.com
is a registered trademark of National Semiconductor Corporation.
Connection Diagrams
LM71
SOT23-5 LLP-6 No Pull-Back
TOP VIEW
NS Package Number MF05A
Ordering Information
Order Number
LM71CIMF T16C MF05A 2.65V to 5.5V 3000 Units in Tape and Reel
LM71CISD LM71C SDE06A 2.65V to 5.5V 4500 Units in Tape and Reel
Package
Marking
20031702
NS Package
Number
TOP VIEW
20031728
NS Package Number SDE06A
Supply Voltage Transport Media
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Pin Descriptions
Label Pin Number Function Typical Connection
SOT23-5 LLP-6
CS
GND 2 2, 5 Power Supply Ground Connect all GND Pins to ground
SI/O 3 3 Slave Input/Output - Serial bus
SC 4 1 Slave Clock - Serial bus clock Shmitt
+
V
1 4 Chip Select input From controller
From and to controller
bi-directional data line. Shmitt trigger input.
From controller
trigger input line
5 6 Positive Supply Voltage Input DC voltage from 2.65V to 5.5V. Bypass with a
0.1 µF ceramic capacitor.
Typical Application
LM71
FIGURE 1. COP Microcontroller Interface
20031703
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Absolute Maximum Ratings (Note 1)
LM71
Supply Voltage −0.3V to 6.0V
Voltage at any Pin −0.3V to V
Input Current at any Pin (Note 2) 5 mA
Storage Temperature −65˚C to +150˚C
Soldering Information, Lead Temperature
SOT23-5 Package (Note 3)
Vapor Phase (60 seconds)
Infrared (15 seconds)
LLP-6 Package (Note 3)
Infrared (5 seconds) 215˚C
+
+ 0.3V
215˚C
220˚C
ESD Susceptibility (Note 4)
Human Body Model
Machine Model
Operating Ratings
Specified Temperature Range
(Note 5) T
LM71CIMF, LM71CISD −40˚C to +150˚C
Supply Voltage Range (+V
)
S
LM71CIMF, LM71CISD +2.65V to +5.5V
MIN
2000V
200V
to T
MAX
Temperature-to-Digital Converter Characteristics Unless otherwise noted, these specifica-
tions apply for V
+
= 2.65V to 3.6V (Note 6). Boldface limits apply for TA=TJ=T
MIN
to T
; all other limits TA=TJ=
MAX
+25˚C, unless otherwise noted.
LM71CIMF
Parameter Conditions
Typical
(Note 7)
LM71CISD
Limits
Units
(Limit)
(Note 8)
Temperature Error
= −10˚C to +65˚C
T
A
±
1.5 ˚C (max)
(Note 6)
TA= −40˚C to +85˚C
T
= −40˚C to +150˚C +3/−2 ˚C (max)
A
Resolution 14
0.03125
Temperature
(Note 9) 200 270 ms (max)
±
2.0 ˚C (max)
Bits
˚C
Conversion Time
Quiescent Current Serial Bus Inactive 300 550 µA (max)
Logic Electrical Characteristics
DIGITAL DC CHARACTERISTICS Unless otherwise noted, these specifications apply for V+= 2.65V to 3.6V (Note 6). Boldface limits apply for T
A=TJ=TMIN
to T
Symbol Parameter Conditions
V
IN(1)
V
IN(0)
Logical “1” Input Voltage V+x 0.7 V (min)
Logical “0” Input Voltage −0.3 V (min)
Input Hysteresis Voltage V
I
IN(1)
I
IN(0)
C
IN
V
OH
V
OL
I
O_TRI-STATE
Logical “1” Input Current VIN=V
Logical “0” Input Current VIN= 0V −0.005 −3.0 µA (min)
All Digital Inputs 20 pF
High Level Output Voltage IOH= −400 µA 2.4 V (min)
Low Level Output Voltage IOL=+2mA 0.4 V (max)
TRI-STATE®Output Leakage
Current
; all other limits TA=TJ= +25˚C, unless otherwise noted.
MAX
Typical
(Note 7)
+
= 3.0V to 3.6V 0.4 0.33 V (min)
+
0.005 3.0 µA (max)
VO= GND
+
=V
V
O
Limits
(Note 8)
+
V
+ 0.3 V (max)
+
V
x 0.3 V (max)
−1
+1
µA (max)
Units
(Limit)
µA (min)
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