Rainbow Electronics LM63 - Manual

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
LM63
±
1˚C/
±
3˚C
Accurate
Remote
Diode
Digital
T
emperature
Sensor
with
Integrated
Fan
Control
© 2003 National Semiconductor Corporation DS200570 www.national.com