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PDF LM63DIMA Data sheet ( Hoja de datos )
| Número de pieza | LM63DIMA | |
| Descripción | 1C/3C Accurate Remote Diode Digital Temperature Sensor with Integrated Fan Control | |
| Fabricantes | National Semiconductor | |
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May 2003
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
IPWML Version
Max
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
Intel® and Pentium® are registered trademarks of Intel Corporation.
© 2003 National Semiconductor Corporation DS200570
20057001
www.national.com
1 page  
AC Electrical Characteristics
The following specifications apply for VDD = 3.0 VDC to 3.6 VDC, and all analog source impedance RS = 50Ω unless other-
wise specified in the conditions. Boldface limits apply for TA = TMIN to TMAX; all other limits TA= +25˚C.
Symbol
Parameter
Conditions
Typical
(Note 7)
Limits
(Note 8)
Units
(Limit)
TACHOMETER ACCURACY
Fan Control Accuracy
±10 % (max)
Fan Full-Scale Count
65535
(max)
Fan Counter Clock Frequency 90 kHz
Fan Count Update Frequency 1.0 Hz
FAN PWM OUTPUT
Frequency Accuracy
±10 % (max)
Digital Electrical Characteristics
Symbol
Parameter
VIH Logical High Input Voltage
VIL Logical Low Input Voltage
IIH Logical High Input Current
IIL Logical Low Input Current
CIN Digital Input Capacitance
Conditions
VIN = VDD
VIN = GND
Typical
(Note 7)
0.005
−0.005
20
Limits
(Note 8)
2.1
0.8
+10
−10
Units
(Limit)
V (min)
V (max)
µA (max)
µA (max)
pF
SMBus Logical Electrical Characteristics
The following specifications apply for VDD = 3.0 VDC to 3.6 VDC, and all analog source impedance RS = 50Ω unless other-
wise specified in the conditions. Boldface limits apply for TA = TMIN to TMAX; all other limits TA = +25˚C.
Symbol
Parameter
Conditions
Typical
(Note 7)
Limits
(Note 8)
Units
(Limit)
SMBDAT OPEN-DRAIN OUTPUT
VOL Logic Low Level Output Voltage
IOH High Level Output Current
SMBDAT, SMBCLK INPUTS
IOL = 4 mA
VOUT = VDD
0.03
0.4 V (max)
10 µA (max)
VIH
VIL
VHYST
Logical High Input Voltage
Logical Low Input Voltage
Logic Input Hysteresis Voltage
2.1 V (min)
0.8 V (max)
320 mV
5 www.national.com
5 Page 
1.0 Functional Description (Continued)
No-Acknowledge from the Master. Note that the No-
Acknowledge is typically used as a signal for the slave
indicating that the Master has read its last byte.
1.9 DIGITAL FILTER
The LM63 incorporates a user-configured digital filter to
suppress erroneous Remote Temperature readings due to
noise. The filter is accessed in the Remote Diode Tempera-
ture Filter and Comparator Mode Register. The filter can be
set according to the following table.
Level 2 is maximum filtering.
Digital Filter Selection Table
D2 D1 Filter
0 0 No Filter
0 1 Level 1
1 0 Level 1
1 1 Level 2
20057011
FIGURE 7. Impulse Response of the Digital Filter
20057010
FIGURE 6. Step Response of the Digital Filter
20057012
FIGURE 8. Digital Filter Response in an Intel Pentium 4
processor System. The Filter on and off curves were
purposely offset to better show noise performance.
11 www.national.com
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