National Semiconductor LM70 Technical data
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LM70
LM70 SPI/MICROWIRE10-Bit plus Sign Digital Temperature Sensor
July 2000
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 than10µA. 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, electronic test equipment, and office electronics.
Applications
n System Thermal Management
n Personal Computers
n Disk Drives
n Office Electronics
n Electronic Test Equipment
Features
n 0.25˚C temperature resolution.
n Shutdown mode conserves power between temperature
reading
n SPI and MICROWIRE Bus interface
n MSOP-8 and LLP-8 packages save space
Key Specifications
j
Supply Voltage 2.65V to 5.5V
j
Supply Current operating 260µA (typ)
490µA (max)
shutdown 12µA (typ)
j
Temperature
Accuracy
−40˚C to 85˚C
−10˚C to 65˚C +1.5/−2˚C(max)
−55˚C to 125˚C +3/−2˚C(max)
−55˚C to 150˚C +3.5/−2˚C(max)
±
2˚C(max)
Simplified Block Diagram
DS101223-1
MICROWIRE®is a registered trademark of National Semiconductor Corporation.
© 2000 National Semiconductor Corporation DS101223 www.national.com
Connection Diagrams
LM70
MSOP-8
DS101223-2
TOP VIEW
NS Package Number MUA08A
LLP-8
DS101223-25
TOP VIEW
NS Package Number LDA08A
Ordering Information
Order Number
LM70CILD-3 T33 LLP-8, LDA08A 2.65V to 3.6V _ Units in Rail
LM70CILDX-3 T33 LLP-8, LDA08A 2.65V to 3.6V _ Units in Rail
LM70CILD-5 T35 LLP-8, LDA08A 4.5V to 5.5V _ Units in Tape and Reel
LM70CILDX-5 T35 LLP-8, LDA08A 4.5V to 5.5V _ Units in Tape and Reel
LM70CIMM-3 T04C MSOP-8, MUA08A 2.65V to 3.6V 250 Units in Rail
LM70CIMMX-3 T04C MSOP-8, MUA08A 2.65V to 3.6V 3500 Units in Tape and Reel
LM70CIMM-5 T03C MSOP-8, MUA08A 4.5V to 5.5V 250 Units in Rail
LM70CIMMX-5 T03C MSOP-8, MUA08A 4.5V to 5.5V 3500 Units in Tape and Reel
Package
Marking
NS Package
Number
Supply Voltage Transport Media
Pin Descriptions
Label SOP-8
Pin
SI/O 1 1 Input/Output - Serial bus bi-directional data
SC 2 3 Clock - Serial bus clock Schmitt trigger input
GND 4 7 Power Supply Ground Ground
+
V
CS
NC 3, 6, 8 2, 4, 6 No Connect These pins are not connected to the
5 5 Positive Supply Voltage Input DC Voltage from 2.65V to 5.5V. Bypass
7 8 Chip Select input. From Controller
LLP-8
#
Pin
#
line. Schmitt trigger input.
line.
Function Typical Connection
From and to Controller
From Controller
with a 0.1 µF ceramic capacitor.
LM70 die in any way.
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Typical Application
LM70
DS101223-3
FIGURE 1. COP Microcontroller Interface
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Absolute Maximum Ratings (Note 1)
LM70
Supply Voltage −0.3V to 6.0V
Voltage at any Pin −0.3V to V
Input Current at any Pin (Note 2) 5 mA
Package Input Current (Note 2) 20 mA
Storage Temperature −65˚C to +150˚C
Soldering Information, Lead Temperature
MSOP-8 and LLP-8 Packages
+
+ 0.3V
ESD Susceptibility (Note 4)
Human Body Model 3000V
Machine Model 300V
Operating Ratings
Specified Temperature Range T
(Note 5) −55˚C to +150˚C
Supply Voltage Range (+V
) +2.65V to +5.5V
S
(Note 3)
Vapor Phase (60 seconds)
Infrared (15 seconds)
215˚C
220˚C
Temperature-to-Digital Converter Characteristics
Unless otherwise noted, these specifications apply for V+= 2.65V to 3.6V for the LM70-3 and V+= 4.5V to 5.5V for the LM70-5
(Note 6). Boldface limits apply for TA=TJ=T
Parameter Conditions
Temperature Error (Note 6) T
= −10˚C to +65˚C +1.5/−2.0 +1.5/−2.0 ˚C (max)
A
T
= −40˚C to +85˚C
A
T
= −55˚C to +125˚C +3.0/−2.0 +3.0/−2.0 ˚C (max)
A
T
= −55˚C to +150˚C +3.5/−2.0 +3.5/−2.0 ˚C (max)
A
Resolution 11
Temperature Conversion Time (Note 9) 140 210 210 ms (max)
Quiescent Current Serial Bus Inactive 260 490 490 µA (max)
Serial Bus Active 260 µA
Shutdown Mode 12 µA
MIN
to T
; all other limits TA=TJ=+25˚C, unless otherwise noted.
MAX
Typical
(Note 7)
LM70-5
Limits
(Note 8)
±
2.0
LM70-3
Limits
(Note 8)
±
2.0 ˚C (max)
0.25
(Limit)
MIN
Units
Bits
˚C
to T
MAX
Logic Electrical Characteristics
DIGITAL DC CHARACTERISTICS
Unless otherwise noted, these specifications apply for V+= 2.65V to 3.6V for the LM70-3 and V+= 4.5V to 5.5V for the
LM70-5. Boldface limits apply for T
A=TJ=TMIN
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
to T
V
VO= GND
V
; all other limits TA=TJ=+25˚C, unless otherwise noted.
MAX
Typical
(Note 7)
+
= 2.65V to 3.6V 0.8 0.27 V (min)
+
= 4.5V to 5.5V 0.8 0.35 V (min)
O
=V
+
+
0.005 3.0 µA (max)
Limits
(Note 8)
+
V
+ 0.3 V (max)
+
V
x 0.3 V (max)
−1
+1
Units
(Limit)
µA (min)
µA(max)
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