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LM63 Datasheet Preview

LM63 Datasheet

Accurate Remote Diode Digital Temperature Sensor

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LM63
www.ti.com
SNAS190E – SEPTEMBER 2002 – REVISED MAY 2013
LM63 ±1°C/±3°C Accurate Remote Diode Digital Temperature Sensor with Integrated Fan
Control
Check for Samples: LM63
FEATURES
1
23 Accurately Senses Diode-Connected 2N3904
Transistors or Thermal Diodes On Board Large
Processors or ASICs
• 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
• 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
• 8-Pin SOIC Package
APPLICATIONS
• Computer Processor Thermal Management
(Laptop, Desktop, Workstations, Servers)
• Graphics Processor Thermal Management
• Electronic Test Equipment
• Projectors
• Office Equipment
• Industrial Controls
DESCRIPTION
The LM63 is a remote diode temperature sensor with
integrated 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.
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.
CONNECTION DIAGRAM
1
VDD
2
D+
3
D-
4
PWM
LM63
8 SMBCLK
7
SMBDAT
6
ALERT / TACH
5
GND
Figure 1. 8-Pin SOIC (D Package)
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
Intel, Pentium are registered trademarks of Intel Corporation.
2
All other trademarks are the property of their respective owners.
3
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2002–2013, Texas Instruments Incorporated




etcTI

LM63 Datasheet Preview

LM63 Datasheet

Accurate Remote Diode Digital Temperature Sensor

No Preview Available !

LM63
SNAS190E – SEPTEMBER 2002 – REVISED MAY 2013
KEY SPECIFICATIONS
• Remote Diode Temp Accuracy (with quantization error)
www.ti.com
Ambient Temp
30 to 50°C
Diode Temp
60 to 100°C
IPWML Max
5 mA
30 to 50°C
60 to 100°C
5 mA
0 to 85°C
25 to 125°C
8 mA
• Local Temp Accuracy (includes quantization error)
Version
LM63C
LM63D
All
Max Error
±1.0°C
±3.0°C
±3.0°C
Ambient Temp
25°C to 125°C
• Supply Voltage: 3.0 V to 3.6 V
• Supply Current: 1.3 mA (typ)
Max Error
±3.0°C
PIN
NAME
1
VDD
2
D+
3
D
4
PWM
5
GND
6 ALERT/TACH
7
SMBDAT
8
SMBCLK
INPUT/OUTPUT
Power Supply Input
Analog Input
Analog Input
Open-Drain
Digital Output
Ground
Digital I/O
Digital Input/
Open-Drain Output
Digital Input
PIN DESCRIPTIONS
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 VDD 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
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Product Folder Links: LM63
Copyright © 2002–2013, Texas Instruments Incorporated


Part Number LM63
Description Accurate Remote Diode Digital Temperature Sensor
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