LM63
±
1˚C/
±
3˚C Accurate Remote Diode Digital Temperature Sensor with Integrated Fan Control
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.
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
Max
Error
error)
Ambient
Temp
30 to 50˚C
30 to 50˚C
0 to 85˚C
Diode
Temp
60 to 100˚C
60 to 100˚C
25 to 125˚C
I
PWML
Max
5 mA
5 mA
8 mA
Version
LM63C
LM63D
All
Max Error
±
1.0˚C
±
3.0˚C
±
3.0˚C
j
Local Temp Accuracy (includes quantization error)
Ambient Temp
25˚C to 125˚C
j
Supply Voltage
j
Supply Current
±
3.0˚C
3.0 V to 3.6 V
1.3 mA (typ)
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
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.
© 2003 National Semiconductor Corporation
DS200570
www.national.com
LM63
Pin Descriptions
Pin
Name
Input/Output
Function and Connection
Connect to a low-noise +3.3
±
0.3 VDC power supply, and bypass to GND
with a 0.1 µF ceramic capacitor in parallel with a 100 pF ceramic capacitor.
A bulk capacitance of 10 µF needs to be in the vicinity of the LM63’s V
DD
pin.
Connect to the anode (positive side) of the remote diode. A 2.2 nF ceramic
capacitor must be connected between pins 2 and 3.
Connect to the cathode (negative side) of the remote diode. A 2.2 nF
ceramic capacitor must be connected between pins 2 and 3.
Open-Drain Digital Output. Connect to fan drive circuitry. The power-on
default for this pin is low (pin 4 pulled to ground).
This is the analog and digital ground return.
Depending on how the LM63 is programmed, this pin is either an
open-drain ALERT output
or
a tachometer input for measuring fan speed.
The power-on default for this pin is the ALERT function.
This is the bi-directional SMBus data line.
Digital Input. This is the SMBus clock input.
1
V
DD
Power Supply Input
2
3
4
5
6
D+
D−
PWM
GND
ALERT/TACH
Analog Input
Analog Input
Open-Drain
Digital Output
Ground
Digital I/O
Digital Input/
Open-Drain Output
Digital Input
7
8
SMBDAT
SMBCLK
Simplified Block Diagram
20057002
www.national.com
2
LM63
Typical Application
20057003
Ordering Information
Part Description
LM63C (
±
1˚C) 8-pin SOIC
LM63C (
±
1˚C) 8-pin SOIC
LM63D (
±
3˚C) 8-pin SOIC
LM63D (
±
3˚C) 8-pin SOIC
LM63 Evaluation Board
With Software and User’s Guide
Top Mark
LM63CIMA
LM63CIMA
LM63DIMA
LM63DIMA
N/A
Order Number
LM63CIMAX
LM63CIMA
LM63DIMAX
LM63DIMA
LM63EVAL
Transport Media
2500 Units in Tape and Reel
95 Units in Rail
2500 Units in Tape and Reel
95 Units in Rail
Packaged
3
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LM63
Absolute Maximum Ratings
2)
Supply Voltage, V
DD
Voltage on SMBDAT, SMBCLK,
ALERT/Tach, PWM Pins
Voltage on Other Pins
Input Current, D− Pin
Input Current at All Other Pins (Note 3)
Package Input Current (Note 3)
Package Power Dissipation
SMBDAT, ALERT, PWM pins
Output Sink Current
Storage Temperature
(Notes 1,
ESD Susceptibility
(Note 4)
Human Body Model
2000 V
200 V
Machine Model
Soldering Information, Lead Temperature
SOIC-8 Package (Note 6)
Vapor Phase (60 seconds)
Infrared (15 seconds)
215˚C
220˚C
−0.3 V to 6.0 V
−0.5 V to 6.0 V
−0.3 V to (V
DD
+ 0. 3 V)
±
1 mA
5 mA
30 mA
(Note 5)
10 mA
−65˚C to +150˚C
Operating Ratings
(Notes 1, 2)
Specified Temperature Range
LM63CIM, LM63DIM
Remote Diode Temperature Range
Supply Voltage Range (V
DD
)
T
MIN
≤
T
A
≤
T
MAX
0˚C
≤
T
A
≤
+85˚C
0˚C
≤
T
A
≤
+125˚C
+3.0 V to +3.6 V
DC Electrical Characteristics
TEMPERATURE-TO-DIGITAL CONVERTER CHARACTERISTICS
The following specifications apply for V
DD
= 3.0 VDC to
3.6 VDC, and all analog source impedance R
S
= 50Ω unless otherwise specified in the conditions.
Boldface limits apply for
T
A
= T
MIN
to T
MAX
;
all other limits T
A
= +25˚C.
Parameter
Temperature Error Using the Remote
Thermal Diode of an Intel Pentium 4
or Mobile Pentium 4 Processor-M
with typical non-ideality of 1.0021.For
other processors e-mail
hardware.monitor.team
@
nsc.com
to
obtain the latest data.
Temperature Error Using the Local
Diode
Remote Diode Resolution
Local Diode Resolution
Conversion Time, All Temperatures
D− Source Voltage
(V
D+
− V
D−
) = +0.65 V; High Current
Diode Source Current
Low Current
All
13
Fastest Setting
Conditions
T
D
= +60 to +100˚C
T
D
= Remote Diode
Junction Temperature
Version
LM63C
LM63D
Typical
(Note 7)
Limits
(Note 8)
Units
(Limits)
˚C (max)
˚C (max)
T
A
= +30 to +50˚C
I
PWML
≤
5 mA
T
A
= +0 to +85˚C
I
PWML
≤
8 mA
±
1
±
3
±
3
±
1
11
0.125
8
1
31.25
0.7
160
315
110
20
7
34.4
T
D
= +25 to +125˚C
All
˚C (max)
T
A
= +25 to +125˚C (Note 10)
All
All
All
All
All
All
±
3
˚C (max)
Bits
˚C
Bits
˚C
ms (max)
V
µA (max)
µA (min)
µA (max)
µA (min)
Operating Electrical Characteristics
Parameter
ALERT and PWM Output Saturation Voltage
I
OUT
I
OUT
Power-On-Reset Threshold Voltage
Supply Current (Note 9)
SMBus Inactive, 16 Hz
Conversion Rate
STANDBY Mode
Conditions
ALERT
4 mA
6 mA
PWM
5 mA
0.4
0.55
2.4
1.8
1.1
300
2.0
V (max)
V (max)
V (min)
mA (max)
µA
Typ
(Note 7)
Limits
(Note 8)
Units
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4
LM63
AC Electrical Characteristics
The following specifications apply for V
DD
= 3.0 VDC to 3.6 VDC, and all analog source impedance R
S
= 50Ω unless other-
wise specified in the conditions.
Boldface limits apply for T
A
= T
MIN
to T
MAX
;
all other limits T
A
= +25˚C.
Symbol
Parameter
Conditions
Typical
(Note 7)
Limits
(Note 8)
Units
(Limit)
% (max)
(max)
kHz
Hz
TACHOMETER ACCURACY
Fan Control Accuracy
Fan Full-Scale Count
Fan Counter Clock Frequency
Fan Count Update Frequency
FAN PWM OUTPUT
Frequency Accuracy
90
1.0
±
10
65535
±
10
% (max)
Digital Electrical Characteristics
Symbol
V
IH
V
IL
I
IH
I
IL
C
IN
Parameter
Logical High Input Voltage
Logical Low Input Voltage
Logical High Input Current
Logical Low Input Current
Digital Input Capacitance
V
IN
= V
DD
V
IN
= GND
0.005
−0.005
20
Conditions
Typical
(Note 7)
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 V
DD
= 3.0 VDC to 3.6 VDC, and all analog source impedance R
S
= 50Ω unless other-
wise specified in the conditions.
Boldface limits apply for T
A
= T
MIN
to T
MAX
;
all other limits T
A
= +25˚C.
Symbol
Parameter
Conditions
Typical
(Note 7)
Limits
(Note 8)
0.4
0.03
10
2.1
0.8
320
Units
(Limit)
V (max)
µA (max)
V (min)
V (max)
mV
SMBDAT OPEN-DRAIN OUTPUT
V
OL
I
OH
V
IH
V
IL
V
HYST
Logic Low Level Output Voltage
High Level Output Current
Logical High Input Voltage
Logical Low Input Voltage
Logic Input Hysteresis Voltage
I
OL
= 4 mA
V
OUT
= V
DD
SMBDAT, SMBCLK INPUTS
5
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