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LM63 Datasheet(PDF) 1 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
Part No. LM63
Description  ±1C/±3C Accurate Remote Diode Digital Temperature Sensor with Integrated Fan Control
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Maker  NSC [National Semiconductor (TI)]
Homepage  http://www.national.com
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LM63 Datasheet(HTML) 1 Page - National Semiconductor (TI)

 
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LM63
±1˚C/±3˚C Accurate Remote Diode Digital Temperature
Sensor with Integrated Fan Control
General Description
The LM63 is a remote diode temperature sensor with inte-
grated fan control. The LM63 accurately measures: (1) its
own temperature and (2) the temperature of a diode-
connected transistor, such as a 2N3904, or a thermal diode
commonly found on Computer Processors, Graphics Pro-
cessor Units (GPU) and other ASIC’s. The LM63 remote
temperature sensor’s accuracy is factory trimmed for the
series resistance and 1.0021 non-ideality of the Intel® 0.13
µm Pentium® 4 and Mobile Pentium 4 Processor-M thermal
diode. The LM63 has an offset register to correct for errors
caused by different non-ideality factors of other thermal di-
odes.
For
the
latest
information
contact
hardware.monitor.team@nsc.com.
The
LM63
also
features
an
integrated,
pulse-width-
modulated (PWM), open-drain fan control output. Fan speed
is a combination of the remote temperature reading, the
lookup table and the register settings. The 8-step Lookup
Table enables the user to program a non-linear fan speed vs.
temperature transfer function often used to quiet acoustic
fan noise.
Features
n
Accurately senses diode-connected 2N3904 transistors
or thermal diodes on-board large processors or ASIC’s
n
Accurately senses its own temperature
n
Factory trimmed for Intel Pentium 4 and Mobile Pentium
4 Processor-M thermal diodes
n
Integrated PWM fan speed control output
n
Acoustic fan noise reduction with User-programmable
8-step Lookup Table
n
Multi-function, user-selectable pin for either ALERT
output, or Tachometer input, functions
n
Tachometer input for measuring fan RPM
n
Offset register can adjust for a variety of thermal diodes
n
10 bit plus sign remote diode temperature data format,
with 0.125˚C resolution
n
SMBus 2.0 compatible interface, supports TIMEOUT
n
LM86-compatible pinout
n
LM86-compatible register set
n
8-pin SOIC package
Key Specifications
j Remote Diode Temp Accuracy
(with quantization
error)
Ambient
Temp
Diode
Temp
I
PWML
Max
Version
Max
Error
30 to 50˚C
60 to 100˚C
5 mA
LM63C
±1.0˚C
30 to 50˚C
60 to 100˚C
5 mA
LM63D
±3.0˚C
0 to 85˚C
25 to 125˚C
8 mA
All
±3.0˚C
j Local Temp Accuracy (includes quantization error)
Ambient Temp
Max Error
25˚C to 125˚C
±3.0˚C
j Supply Voltage
3.0 V to 3.6 V
j Supply Current
1.3 mA (typ)
Applications
n
Computer Processor Thermal Management
(Laptop, Desktop, Workstations, Servers)
n
Graphics Processor Thermal Management
n
Electronic Test Equipment
n
Projectors
n
Office Equipment
n
Industrial Controls
Connection Diagram
20057001
Intel® and Pentium® are registered trademarks of Intel Corporation.
May 2003
© 2003 National Semiconductor Corporation
DS200570
www.national.com


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