LM63 ±1°C/±3°C Accurate Remote Diode Digital Temperature Sensor with Integrated Fan Control
August 5, 2009
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 Processor 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 diodes. For the latest in-
formation 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 combi-
nation 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.
The LM63CIM-16 remote diode temperature reading is shift-
ed down 16°C as described by the equation:
True T
DIODE JUNCTION
=T
LM63CIM-16
+ 16°C
■
Offset register can adjust for a variety of thermal diodes
■
10 bit plus sign remote diode temperature data format,
■
■
■
■
■
with 0.125°C resolution
SMBus 2.0 compatible interface, supports TIMEOUT
LM86-compatible pinout
LM86-compatible register set
LM63CIM-16 with −16°C offset remote reading to allow
measurement of remote temperatures > 127.875°C
8-pin SOIC package
Key Specifications
■
Remote Diode Temp Accuracy
(with quantization
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
■
Local Temp Accuracy (includes quantization error)
Ambient Temp
25°C to 125°C
Max Error
±3.0°C
3.0 V to 3.6 V
1.3 mA (typ)
Features
■
Accurately senses diode-connected 2N3904 transistors or
■
■
■
■
■
■
■
thermal diodes on-board large processors or ASIC's
Accurately senses its own temperature
Factory trimmed for Intel Pentium 4 and Mobile Pentium 4
Processor-M thermal diodes
Integrated PWM fan speed control output
Acoustic fan noise reduction with User-programmable 8-
step Lookup Table
Multi-function, user-selectable pin for either ALERT
output, or Tachometer input, functions
Tachometer input for measuring fan RPM
Smart-Tach modes for measuring RPM of fans with pulse-
width-modulated power as shown in typical application
■
Supply Voltage
■
Supply Current
Applications
■
Computer Processor Thermal Management
■
■
■
■
■
(Laptop, Desktop, Workstations, Servers)
Graphics Processor Thermal Management
Electronic Test Equipment
Projectors
Office Equipment
Industrial Controls
Connection Diagram
20057001
Intel™ is a trademark of Intel Corporation.
Pentium™ is a trademark of Intel Corporation.
© 2009 National Semiconductor Corporation
200570
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LM63
Pin Descriptions
Pin
1
Name
V
DD
Input/Output
Power Supply Input
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.
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
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2
LM63
Typical Application
20057003
Ordering Information
Part Description
LM63C (±1°C) 8-pin SOIC
LM63C (±1°C) 8-pin SOIC
LM63C-16 (±1°C) 8-pin SOIC with −16°C
offset remote reading
LM63C-16 (±1°C) 8-pin SOIC with −16°C
offset remote reading
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
LM63CIM16
LM63CIM16
LM63DIMA
LM63DIMA
N/A
Order Number
LM63CIMAX
LM63CIMA
LM63CIMX-16
LM63CIMX-16
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
2500 Units in Tape and
Reel
95 Units in Rail
Packaged
3
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LM63
Absolute Maximum Ratings
(Notes 1, 2)
Supply Voltage, V
DD
−0.3 V to 6.0 V
Voltage on SMBDAT, SMBCLK,
ALERT/Tach, PWM Pins
−0.5 V to 6.0 V
Voltage on Other Pins
−0.3 V to (V
DD
+ 0. 3 V)
Input Current, D− Pin
±1 mA
Input Current at All Other Pins (Note 3)
5 mA
Package Input Current (Note 3)
30 mA
Package Power Dissipation
(Note 5)
SMBDAT, ALERT, PWM pins
Output Sink Current
10 mA
Storage Temperature
−65°C to +150°C
ESD Susceptibility
(Note 4)
Human Body Model
2000 V
Machine Model
200 V
Soldering Information, Lead Temperature
SOIC-8 Package (Note 6)
Vapor Phase (60 seconds)
Infrared (15 seconds)
215°C
220°C
Operating Ratings
Specified Temperature Range
(Notes 1, 2)
T
MIN
≤
T
A
≤
T
MAX
LM63CIM, LM63CIM-16, LM63DIM
Remote Diode Temperature Range
Supply Voltage Range (V
DD
)
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.
Conditions
T
A
= +30 to +50°C
I
PWML
≤
5 mA
I
PWML
≤
8 mA
T
D
= +60 to +100°C
T
D
= Remote Diode
Junction Temperature
T
D
= +25 to +125°C
Version
LM63C
LM63D
Typical
(Note 7)
Limits
(Note 8)
±1
±3
Units
(Limits)
°C (max)
°C (max)
T
A
= +0 to +85°C
All
±3
°C (max)
Temperature Error Using the Local Diode T
A
= +25 to +125°C (Note 10)
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
Fastest Setting
All
All
All
All
All
All
All
±1
11
0.125
8
1
31.25
0.7
160
13
±3
°C (max)
Bits
°C
Bits
°C
34.4
315
110
20
7
ms (max)
V
µA (max)
µA (min)
µA (max)
µA (min)
Operating Electrical Characteristics
Parameter
ALERT and PWM Output Saturation Voltage
Conditions
ALERT
I
OUT
I
OUT
Power-On-Reset Threshold Voltage
Supply Current (Note 9)
SMBus Inactive, 16 Hz
Conversion Rate
STANDBY Mode
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 otherwise
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)
±10
65535
90
1.0
±10
Units
(Limit)
% (max)
(max)
kHz
Hz
% (max)
TACHOMETER ACCURACY
Fan Control Accuracy
Fan Full-Scale Count
Fan Counter Clock Frequency
Fan Count Update Frequency
FAN PWM OUTPUT
Frequency Accuracy
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 otherwise
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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