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PowerPoint Presentation 1
TruTherm Technology 2
© 2006 National Semiconductor Corporation
Nationals Thermal Management
Position
National is the #1 Solution Provider of Choice Industry leader in accuracy, reliability and
packaging Our thermal management solutions improve
system performance, reliability and extend product
life Extensive Portfolio of Sensors
Analog, Thermostats, Remote Diode
Digital, System Hardware Monitors
Packaging
Accuracy
Reliability 3
© 2006 National Semiconductor Corporation
Introducing TruTherm
Technology TruTherm stands for True Thermal
Measurement and is the brand name for
Nationals new temperature monitoring
technology TruTherm technology is an improved
method of measuring temperature on
integrated circuits designed in sub-micron
(90nm & below) processes 4
© 2006 National Semiconductor Corporation
Problem Statement Complex integrated circuits such as
microprocessors, graphics processors and FPGAs
are being designed in smaller sub-micron geometries
to reach higher speeds & integration Internal thermal diodes connect to external
temperature sensors to accurately monitor
temperature, but in sub-micron geometries, readings
based on these diodes vary greatly from processor
to processor Traditional approaches to accurately monitor the
thermal diodes are no longer sufficient to achieve
high-accuracy targets 5
© 2006 National Semiconductor Corporation
TruTherm Technology Benefits
Highly accurate temperature readings for sub-
micron integrated circuits Improves overall temperature accuracy for all systems Extends system life by reducing the chances of device
overheating More accurate temperature readings enable precise fan
control methods, resulting in quieter systems and lower
acoustic noise 6
© 2006 National Semiconductor Corporation
Temperature Measurement
Without TruTherm Technology
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TEMPERATURE READING ERROR (
o
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PROCESSOR TEMPERATURE (
o
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9 different 90nm processors measured
with the same traditional remote diode temperature
sensor ( 6
o
C spread in accuracy) 7
© 2006 National Semiconductor Corporation
-3.0
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PROCESSOR TEMPERATURE (
o
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TEMPERATURE ERROR (
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C)
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Temperature Measurement With
TruTherm Technology
Temperature Measurement Variations reduced
Temperature Measurement Variations reduced
to less than 0.5
to less than 0.5
o
C
C
!
! 8
© 2006 National Semiconductor Corporation
Temperature Measurement Without
TruTherm Technology
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PROCESSOR TEMPERATURE ('C)
TEMP
ERATURE ERROR ('C)
P 1
P 2
P 3
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P 11
11 different 65nm processors measured
with the same traditional remote diode temperature
sensor ( 3
o
C spread in accuracy) 9
© 2006 National Semiconductor Corporation
Temperature Measurement With
TruTherm Technology
-1
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o
PROCESSOR TEMPERATURE ( C)
TEMP
ERATURE ERROR (
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C)
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Temperature
Temperature
Measurement
Measurement
Variations
Variations
reduced to less than
reduced to less than
0.5
0.5
o
C!
C! 10
© 2006 National Semiconductor Corporation
LM95231 with TruTherm
Technology High-precision, 2 remote and local digital
temperature sensor Features a precision sigma-delta analog-to-digital
converter for reduced sensitivity to noise and
includes digital filtering and remote diode fault
detection Compatible with the SMBus 2.0 and I2C bus
specifications Space-saving 8-pin MSOP package 11
© 2006 National Semiconductor Corporation
LM95235 with
TruTherm
Technology High-precision, 1 remote and local digital temperature
sensor Features a diode model selection bit to select between
a typical Intel® processor on a 65 nm or 90 nm process
or MMBT3904, as well as an offset register for
maximum flexibility and best accuracy Three TCRIT outputs with limit comparison registers Compatible with the SMBus 2.0 specifications Space-saving 8-pin MSOP package 12
© 2006 National Semiconductor Corporation
LM94 with
TruTherm
Technology Hardware Monitor with PI Loop Fan Control for Server
Management Measures temperature of four remote diode connected
transistors as well as its own die and 16 power supply
voltages Dynamic Vccp monitoring with support for VRD10, 10.2
and 11 specifications GPIOs, VRD_HOT, and PROCHOT digital functions for
Server Management Compatible with the SMBus 2.0 specifications with
block read/writes 56-pin TSSOP package 13
© 2006 National Semiconductor Corporation
Summary TruTherm technology revolutionizes
temperature measurement accuracy for sub-
micron integrated circuits. The LM95231, LM95235 and LM94 are first in a
family of TruTherm technology-based products
by National Semiconductor