LM90 Datasheet PDF - National Semiconductor

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LM90
National Semiconductor

Part Number LM90
Description Remote Diode and Local Digital Temperature Sensor
Page 20 Pages


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February 2002
LM90
±3˚C Accurate, Remote Diode and Local Digital
Temperature Sensor with Two-Wire Interface
General Description
The LM90 is an 11-bit digital temperature sensor with a
2-wire System Management Bus (SMBus) serial interface.
The LM90 accurately measures its own temperature as well
as the temperature of an external device, such as processor
thermal diode or diode connected transistor such as the
2N3904. The temperature of any ASIC can be accurately
determined using the LM90 as long as a dedicated diode
(semiconductor junction) is available on the target die. The
LM90 remote sensor accuracy of ±3˚C is factory trimmed for
the 1.008 typical non-ideality factor of the mobile Pentium
III thermal diode. The LM90 has an Offset
register to allow measuring other diodes without
requiring continuous software management. Contact
hardware.monitor.team@nsc.com to obtain the latest data for
new processors.
Activation of the ALERT output occurs when any tempera-
ture goes outside a preprogrammed window set by the HIGH
and LOW temperature limit registers or exceeds the T_CRIT
temperature limit. Activation of the T_CRIT_A occurs when
any temperature exceeds the T_CRIT programmed limit.
The LM90 is pin and register compatible with the LM86,
Analog Devices ADM1032 and Maxim MAX6657/8.
Features
n Accurately senses die temperature of remote ICs or
diode junctions
n Offset register allows sensing a variety of thermal
diodes accurately
n On-board local temperature sensing
n 10 bit plus sign remote diode temperature data format,
0.125 ˚C resolution
n Diode fault detection circuitry
n T_CRIT_A output useful for system shutdown (open
diode does not activate T_CRIT_A)
n ALERT output supports SMBus 2.0 protocol
n SMBus 2.0 compatible interface, supports TIMEOUT
n 8-pin MSOP packages
Key Specifications
j Supply Voltage
3.0V to 3.6V
j Supply Current
0.8mA (typ)
j Local Temp Accuracy (includes quantization error)
TA=25˚C to 125˚C ±4.0˚C (max)
j Remote Diode Temp Accuracy (includes quantization
error)
TA=30˚C to 50˚C, TD=60˚C to 100˚C
TA=0˚C to 85˚C, TD=25˚C to 125˚C
±3.0˚C (max)
±4.0˚C (max)
Applications
n System Thermal Management
(e.g. Laptop, Desktop, Workstations, Server)
n Electronic Test Equipment
n Office Electronics
LM90 Simplified Block Diagram
Pentiumis a trademark of Intel Corporation.
© 2002 National Semiconductor Corporation DS200337
20033701
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Connection Diagram
MSOP-8
TOP VIEW
20033702
Ordering Information
LM90CIMM
LM90CIMMX
Pin Descriptions
Label
Pin #
VDD
1
D+
D−
T_CRIT_A
GND
ALERT
SMBData
SMBCLK
2
3
4
5
6
7
8
Package
Marking
T11C
T11C
NS Package
Number
MUA08A
(MSOP-8)
MUA08A
(MSOP-8)
Transport
Media
1000 Units on
Tape and Reel
3500 Units on
Tape and Reel
Function
Positive Supply Voltage
Input
Diode Current Source
Diode Return Current Sink
T_CRIT Alarm Output,
Open-Drain, Active-Low
Power Supply Ground
Interrupt Output,
Open-Drain, Active-Low
SMBus Bi-Directional Data
Line, Open-Drain Output
SMBus Input
Typical Connection
DC Voltage from 3.0 V to 3.6 V
To Diode Anode. Connected to remote discrete
diode conected transistor junction or to the diode
connected transistor junction on a remote IC whose
die temperature is being sensed.
To Diode Cathode.
Pull-Up Resistor, Controller Interrupt or Power
Supply Shutdown Control
Ground
Pull-Up Resistor, Controller Interrupt or Alert Line
From and to Controller, Pull-Up Resistor
From Controller, Pull-Up Resistor
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Typical Application
20033703
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Absolute Maximum Ratings (Note 1)
Supply Voltage
−0.3 V to 6.0 V
Voltage at SMBData, SMBCLK,
ALERT, T_CRIT_A
−0.5V to 6.0V
Voltage at Other Pins
−0.3 V to
D− Input Current
(VDD + 0.3 V)
±1 mA
Input Current at All Other Pins (Note
2)
±5 mA
Package Input Current (Note 2)
30 mA
SMBData, ALERT, T_CRIT_A Output
Sink Current
10 mA
Storage Temperature
−65˚C to
+150˚C
Soldering Information, Lead Temperature
SOIC-8 or MSOP-8 Packages (Note
3)
Vapor Phase (60 seconds)
Infrared (15 seconds)
ESD Susceptibility (Note 4)
Human Body Model
Machine Model
Operating Ratings
(Notes 1, 5)
Operating Temperature Range
Electrical Characteristics
Temperature Range
LM90
Supply Voltage Range (VDD)
215˚C
220˚C
2000 V
200 V
0˚C to +125˚C
TMINTATMAX
0˚CTA+85˚C
+3.0V to +3.6V
Temperature-to-Digital Converter Characteristics
Unless otherwise noted, these specifications apply for VDD=+3.0Vdc to 3.6Vdc. Boldface limits apply for TA = TJ =
TMINTATMAX; all other limits TA= TJ=+25˚C, unless otherwise noted.
Parameter
Conditions
Typical
Limits
Units
(Note 6)
(Note 7)
(Limit)
Temperature Error Using Local Diode
Temperature Error Using Remote Diode of
mobile Pentium III with typical non-ideality of
TA = +25˚C to +125˚C, (Note 8)
TA = +30˚C to
TD = +25˚C
+50˚C
to +100˚C
±1.5
±4 ˚C (max)
±3
˚C (max)
1.008. For other processors email
hardware.monitor.team@nsc.com to obtain the
latest data. (TD is the Remote Diode Junction
Temperature)
TA = +0˚C to
+85˚C
TD = +25˚C
to +125˚C
±4 ˚C (max)
Remote Diode Measurement Resolution
11 Bits
0.125
˚C
Local Diode Measurement Resolution
8 Bits
1 ˚C
Conversion Time of All Temperatures at the (Note 10)
31.25 34.4 ms (max)
Fastest Setting
Quiescent Current (Note 9)
SMBus Inactive, 16Hz conversion
0.8
1.7 mA (max)
rate
Shutdown
315 µA
D− Source Voltage
0.7 V
Diode Source Current
(D+ − D−)=+ 0.65V; high level
160
315 µA (max)
110 µA (min)
Low level
13 20 µA (max)
7 µA (min)
ALERT and T_CRIT_A Output Saturation
Voltage
IOUT = 6.0 mA
0.4
V (max)
Power-On Reset Threshold
Measure on VDD input, falling
edge
2.4 V (max)
1.8 V (min)
Local and Remote HIGH Default Temperature (Note 11)
+70 ˚C
settings
Local and Remote LOW Default Temperature (Note 11)
0 ˚C
settings
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