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Table Of Contents

LM63

VDD

D+

D-

PWM

SMBCLK

SMBDAT

ALERT / TACH

GND

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

DESCRIPTION

The LM63 is a remote diode temperature sensor with

• Accurately Senses Diode-Connected 2N3904

integrated fan control. The LM63 accurately

Transistors or Thermal Diodes On Board Large

measures: (1) its own temperature and (2) the

Processors or ASICs

temperature of a diode-connected transistor, such as

• Accurately Senses its Own Temperature

a 2N3904, or a thermal diode commonly found on

Computer Processors, Graphics Processor Units

• Factory Trimmed for Intel

Pentium

4 and

(GPU) and other ASIC's. The LM63 remote

Mobile Pentium 4 Processor-M Thermal Diodes

temperature sensor's accuracy is factory trimmed for

• Integrated PWM Fan Speed Control Output

the series resistance and 1.0021 non-ideality of the

• Acoustic Fan Noise Reduction With User-

Intel 0.13 µm Pentium 4 and Mobile Pentium 4

Programmable 8-Step Lookup Table

Processor-M thermal diode. The LM63 has an offset

• Multi-Function, User-Selectable Pin for Either

ideality factors of other thermal diodes.

ALERT Output, or Tachometer Input,

Functions

The LM63 also features an integrated, pulse-width-

modulated (PWM), open-drain fan control output. Fan

• Tachometer Input for Measuring Fan RPM

speed is a combination of the remote temperature

• Smart-Tach Modes for Measuring RPM of Fans

reading, the lookup table and the register settings.

With Pulse-Width-Modulated Power as Shown

The 8-step Lookup Table enables the user to

in Typical Application

program a non-linear fan speed vs. temperature

• Offset Register can Adjust for a Variety of

transfer function often used to quiet acoustic fan

Thermal Diodes noise.

• 10 Bit Plus Sign Remote Diode Temperature

CONNECTION DIAGRAM

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

Figure 1. 8-Pin SOIC (D Package)

• Computer Processor Thermal Management

(Laptop, Desktop, Workstations, Servers)

• Graphics Processor Thermal Management

• Electronic Test Equipment

• Projectors

• Office Equipment

• Industrial Controls

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.

2Intel, Pentium are registered trademarks of Intel Corporation.

3All other trademarks are the property of their respective owners.

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.

Summary of content (41 pages)

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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 DESCRIPTION • The LM63 is a remote diode temperature sensor with integrated fan control.
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LM63 SNAS190E – SEPTEMBER 2002 – REVISED MAY 2013 www.ti.com KEY SPECIFICATIONS • Remote Diode Temp Accuracy (with quantization error) • Ambient Temp Diode Temp IPWML 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 Local Temp Accuracy (includes quantization error) • • Ambient Temp Max Error 25°C to 125°C ±3.0°C Supply Voltage: 3.0 V to 3.6 V Supply Current: 1.
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LM63 www.ti.com SNAS190E – SEPTEMBER 2002 – REVISED MAY 2013 SIMPLIFIED BLOCK DIAGRAM Internal Diode LM63 D+ D- Diode Bias and Control '6 ADC Tachometer Detection SMBDAT SMBCLK 2 - Wire Serial Interface Temp Reading, Temp Limit, Hysteresis, and Temp Sensor Filter Registers Comparators Tach ALERT/Tach ALERT Status and Status Mask Registers PWM PWM Fan Control Registers PWM Fan Control Figure 2.
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LM63 SNAS190E – SEPTEMBER 2002 – REVISED MAY 2013 www.ti.com TYPICAL APPLICATION +3.3 VDC from motherboard 0.1 10 PF These two capacitors are close to Pin 1 ALERT to system shutdown circuitry Fan voltage +12 or +5 VDC 100 pF LM63 1 Processor 2 VDD SMBCLK D+ SMBDAT D- ALERT / Tach 8 7 To SMBus interface control circuitry 2.2 nF 3 4 PWM GND 6 13k Tach In 5 10k Fan V+ Tach. input from Fan Fan V- +3.3 VDC Remote diodeconnected transistor inside of an Intel® Pentium® 4 Processor 1k 0.
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LM63 www.ti.com SNAS190E – SEPTEMBER 2002 – REVISED MAY 2013 ABSOLUTE MAXIMUM RATINGS (1) (2) −0.3 V to 6.0 V Supply Voltage, VDD −0.5 V to 6.0 V Voltage on SMBDAT, SMBCLK, ALERT/Tach, PWM Pins −0.3 V to (VDD + 0.
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LM63 SNAS190E – SEPTEMBER 2002 – REVISED MAY 2013 www.ti.com OPERATING RATINGS (1) (2) Specified Temperature Range (TMIN ≤ TA ≤ TMAX) 0°C ≤ TA ≤ +85°C LM63CIM, LM63DIM 0°C ≤ TA ≤ +125°C Remote Diode Temperature Range Supply Voltage Range (VDD) (1) (2) +3.0 V to +3.6 V Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is functional, but do not ensure performance limits.
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LM63 www.ti.com SNAS190E – SEPTEMBER 2002 – REVISED MAY 2013 AC ELECTRICAL CHARACTERISTICS The following specifications apply for VDD = 3.0 VDC to 3.6 VDC, and all analog source impedance RS = 50Ω unless otherwise specified in the conditions. Boldface limits apply for TA = TMIN to TMAX; all other limits TA= +25°C.
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LM63 SNAS190E – SEPTEMBER 2002 – REVISED MAY 2013 www.ti.com SMBus DIGITAL SWITCHING CHARACTERISTICS Unless otherwise noted, these specifications apply for VDD = +3.0 VDC to +3.6 VDC, CL (load capacitance) on output lines = 80 pF. Boldface limits apply for TA = TJ; TMIN ≤ TA ≤ TMAX; all other limits TA = TJ = +25°C, unless otherwise noted. The switching characteristics of the LM63 fully meet or exceed the published specifications of the SMBus version 2.0.
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LM63 www.ti.com SNAS190E – SEPTEMBER 2002 – REVISED MAY 2013 FUNCTIONAL DESCRIPTION The LM63 Remote Diode Temperature Sensor with Integrated Fan Control incorporates a ΔVBE-based temperature sensor using a Local or Remote diode and a 10-bit plus sign ΔΣ ADC (Delta-Sigma Analog-to-Digital Converter). The pulse-width modulated (PWM) open-drain output, with a pullup resistor, can drive a switching transistor to modulate fan speed.
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LM63 SNAS190E – SEPTEMBER 2002 – REVISED MAY 2013 www.ti.com THE ALERT/TACH PIN AS ALERT OUTPUT The ALERT/Tach pin is a multi-use pin. In this section, we will address the ALERT active-low open-drain output function. When the ALERT/Tach Select bit is written as a zero in the Configuration Register the ALERT output is selected. Also, when the ALERT Mask bit in the Configuration register is written as zero the ALERT interrupts are enabled.
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LM63 www.ti.com SNAS190E – SEPTEMBER 2002 – REVISED MAY 2013 ALERT OUTPUT AS AN INTERRUPT The LM63's ALERT output can be implemented as a simple interrupt signal when it is used to trigger an interrupt service routine. In such systems it is desirable for the interrupt flag to repeatedly trigger during or before the interrupt service routine has been completed.
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LM63 SNAS190E – SEPTEMBER 2002 – REVISED MAY 2013 www.ti.com The LM63 fulfills “disengaging of ALERT” by setting the ALERT Mask Bit in the Configuration Register after sending out its address in response to an ARA and releasing the ALERT output pin. Once the ALERT Mask bit is activated, the ALERT output pin will be disabled until enabled by software.
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LM63 www.ti.com SNAS190E – SEPTEMBER 2002 – REVISED MAY 2013 POWER-ON RESET (POR) DEFAULT STATES For information on the POR default states, see REGISTER MAP IN FUNCTIONAL ORDER. TEMPERATURE DATA FORMAT Temperature data can only be read from the Local and Remote Temperature registers. The High, Low and T_CRIT setpoint registers are Read/Write. Remote temperature data is represented by an 11-bit, two's complement word with a Least Significant Bit (LSB) equal to 0.125°C.
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LM63 SNAS190E – SEPTEMBER 2002 – REVISED MAY 2013 www.ti.com DIODE FAULT DETECTION The LM63 can detect fault conditions caused by the remote diode. If the D+ pin is detected to be shorted to VDD, or open: (1) the Remote Temperature High Byte (RTHB) register is loaded with 127°C, (2) the Remote Temperature Low Byte (RTLB) register is loaded with 0, and (3) the OPEN bit (D2) in the status register is set.
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LM63 www.ti.com SNAS190E – SEPTEMBER 2002 – REVISED MAY 2013 50 No Filter TEMPERATURE (°C) 45 40 Filter Level 1 35 Filter Level 2 30 25 0 5 10 15 20 25 NUMBER OF SAMPLES Figure 10. Step Response of the Digital Filter 50 TEMPERATURE (°C) 45 No Filter 40 Filter Level 1 35 Filter Level 2 30 25 0 5 10 15 20 25 NUMBER OF SAMPLES Figure 11.
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LM63 SNAS190E – SEPTEMBER 2002 – REVISED MAY 2013 www.ti.com FAULT QUEUE TEMPERATURE The LM63 incorporates a Fault Queue to suppress erroneous ALERT triggering. The Fault Queue prevents false triggering by requiring three consecutive out-of-limit HIGH, LOW, or T_CRIT temperature readings. See Figure 13. The Fault Queue defaults to OFF upon power-up and may be activated by setting the RDTS Fault Queue bit in the Configuration Register to a 1.
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LM63 www.ti.com SNAS190E – SEPTEMBER 2002 – REVISED MAY 2013 LM63 REGISTERS This section includes the following subsections: REGISTER MAP IN HEXADECIMAL ORDER, which shows a summary of all registers and their bit assignments; REGISTER MAP IN FUNCTIONAL ORDER; and REGISTER DESCRIPTIONS IN FUNCTIONAL ORDER, which provides a detailed explanation of each register. Do not address the unused or manufacturer’s test registers.
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LM63 SNAS190E – SEPTEMBER 2002 – REVISED MAY 2013 www.ti.com Table 3.
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LM63 www.ti.com SNAS190E – SEPTEMBER 2002 – REVISED MAY 2013 REGISTER MAP IN FUNCTIONAL ORDER Table 4 is a Register Map grouped in Functional Order. Some address locations have been left blank to maintain compatibility with LM86. Addresses in parenthesis are mirrors of named address. Reading or writing either address will access the same 8-bit register.
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LM63 SNAS190E – SEPTEMBER 2002 – REVISED MAY 2013 www.ti.com Table 4.
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LM63 www.ti.com SNAS190E – SEPTEMBER 2002 – REVISED MAY 2013 REGISTER DESCRIPTIONS IN FUNCTIONAL ORDER The REGISTER DESCRIPTIONS IN FUNCTIONAL ORDER section shows a Register Map grouped in functional order. Some address locations have been left blank to maintain compatibility with LM86. Addresses in parenthesis are mirrors of named address for backwards compatibility with some older software. Reading or writing either address will access the same 8-bit register. Table 5.
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LM63 SNAS190E – SEPTEMBER 2002 – REVISED MAY 2013 www.ti.com Table 5. Fan Control Registers (continued) ADDRESS HEX READ/ WRITE BITS POR VALUE NAME DESCRIPTION 4DHEX FAN PWM FREQUENCY REGISTER 7:5 4D R/W 4:0 000 10111 These bits are unused and always set to 0 PWM Frequency The PWM Frequency = PWM_Clock / 2n, where PWM_Clock = 360 kHz or 1.4 kHz (per the PWM Clock Select bit in Register 4A), and n = value of the register. Note: n = 0 is mapped to n = 1.
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LM63 www.ti.com SNAS190E – SEPTEMBER 2002 – REVISED MAY 2013 Table 5. Fan Control Registers (continued) ADDRESS HEX READ/ WRITE BITS POR VALUE NAME DESCRIPTION 50HEX to 5FHEX LOOKUP TABLE (7 Bits for Temperature and 6 Bits for PWM for each Temperature/PWM Pair) 50 51 52 53 54 55 56 57 58 Read. (Write only if reg 4A bit 5 = 1.
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LM63 SNAS190E – SEPTEMBER 2002 – REVISED MAY 2013 www.ti.com Table 6. Configuration Register ADDRESS HEX READ/ WRITE BITS POR VALUE NAME DESCRIPTION 03 (09)HEX CONFIGURATION REGISTER 7 0 0 STANDBY 5 0 PWM Disable in STANDBY When this bit is a 0, the LM63’s PWM output continues to output the current fan control signal while in STANDBY. When this bit is a 1, the PWM output is disabled (as defined by the PWM polarity bit) while in STANDBY. 4:3 00 These bits are unused and always set to 0.
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LM63 www.ti.com SNAS190E – SEPTEMBER 2002 – REVISED MAY 2013 Table 7.
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LM63 SNAS190E – SEPTEMBER 2002 – REVISED MAY 2013 www.ti.com Table 9. Remote Diode Temperature, Offset And Setpoint Registers ADDRESS HEX 01 READ/ WRITE Read Only 10 Read Only 11 R/W 12 R/W 07 (0D) R/W 13 R/W 08 (0E) 14 R/W R/W POR VALUE NAME DESCRIPTION 7:0 N/A Remote Diode Temperature Reading (MSB) This is the MSB of the 2’s complement value, representing the temperature of the remote diode connected to the LM63.
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LM63 www.ti.com SNAS190E – SEPTEMBER 2002 – REVISED MAY 2013 Table 10. ALERT Status and Mask Registers ADDRESS HEX READ/ WRITE BITS POR VALUE NAME DESCRIPTION 02HEX ALERT STATUS REGISTER (8-bits) (All Alarms are latched until read, then cleared if alarm condition was removed at the time of the read.) 7 0 Busy When this bit is a 0, the ADC is not converting. When this bit is set to a 1, the ADC is performing a conversion. This bit does not affect ALERT status.
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LM63 SNAS190E – SEPTEMBER 2002 – REVISED MAY 2013 www.ti.com Table 11. Conversion Rate And One-Shot Registers ADDRESS HEX READ/ WRITE BITS POR VALUE NAME DESCRIPTION 04 (0A)HEX CONVERSION RATE REGISTER (8-bits) 04 (0A) R/W 7:0 0x08 Conversion Rate Sets the conversion rate of the LM63. 00000000 = 0.0625 Hz 00000001 = 0.125 Hz 00000010 = 0.25 Hz 00000011 = 0.
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LM63 www.ti.com SNAS190E – SEPTEMBER 2002 – REVISED MAY 2013 APPLICATION NOTES FAN CONTROL DUTY CYCLE VS. REGISTER SETTINGS AND FREQUENCY PWM FREQ AT 1.4 kHz INTERNAL CLOCK, Hz ACTUAL DUTY CYCLE, % WHEN 75% IS SELECTED 180.0 703.1 50.0 90.00 351.6 75.0 3 60.00 234.4 83.3 4 45.00 175.8 75.0 8 5 36.00 140.6 80.0 12 9 6 30.00 117.2 75.0 14 11 7 25.71 100.4 78.6 6.25 16 12 8 22.50 87.9 75.0 9 5.56 18 14 9 20.00 78.1 77.8 10 5.00 20 15 10 18.00 70.3 75.
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LM63 SNAS190E – SEPTEMBER 2002 – REVISED MAY 2013 www.ti.com REQUIRED INITIAL FAN CONTROL REGISTER SEQUENCE Important! The BIOS must follow the sequence listed in Table 13 to configure the following Fan Registers for the LM63 before using any of the Fan or Tachometer or PWM registers. Table 13. [Register]HEX and Setup Instructions [Register]HEX AND SETUP INSTRUCTIONS (1) STEP (1) 1 [4A] Write bits 0 and 1; 3 and 4. This includes tach settings if used, PWM internal clock select (1.
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LM63 www.ti.com SNAS190E – SEPTEMBER 2002 – REVISED MAY 2013 USE OF THE LOOKUP TABLE FOR NON-LINEAR PWM VALUES VS TEMPERATURE The Lookup Table, Registers 50 through 5F, can be used to create a non-linear PWM vs Temperature curve that could be used to reduce the acoustic noise from processor fan due to linear or step transfer functions. An example is given below.
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LM63 SNAS190E – SEPTEMBER 2002 – REVISED MAY 2013 www.ti.com A discrete diode can also be used to sense the temperature of external objects or ambient air. Remember that a discrete diode’s temperature will be affected, and often dominated by, the temperature of its leads. Most silicon diodes do not lend themselves well to this application. It is recommended that a diode-connected 2N3904 transistor be used, as shown in Figure 15.
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LM63 www.ti.com SNAS190E – SEPTEMBER 2002 – REVISED MAY 2013 The voltage seen by the LM63 also includes the IF×RS voltage drop across the internal series resistance of the Pentium 4 processor’s thermal diode. The non-ideality factor, η, is the only other parameter not accounted for and depends on the diode that is used for measurement. Since ΔVbe is proportional to both η and T, the variations in η cannot be distinguished from variations in temperature.
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LM63 SNAS190E – SEPTEMBER 2002 – REVISED MAY 2013 www.ti.com PCB LAYOUT FOR MINIMIZING NOISE Figure 16. Ideal Diode Trace Layout In a noisy environment, such as a processor mother board, layout considerations are very critical. Noise induced on traces running between the remote temperature diode sensor and the LM63 can cause temperature conversion errors. Keep in mind that the signal level the LM63 is trying to measure is in microvolts. The following guidelines should be followed: 1. Use a low-noise +3.
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LM63 www.ti.com SNAS190E – SEPTEMBER 2002 – REVISED MAY 2013 REVISION HISTORY Changes from Revision D (May 2013) to Revision E • Page Changed layout of National Data Sheet to TI format ..........................................................................................................
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE OPTION ADDENDUM www.ti.com 1-Nov-2013 (6) Lead/Ball Finish - Orderable Devices may have multiple material finish options. Finish options are separated by a vertical ruled line. Lead/Ball Finish values may wrap to two lines if the finish value exceeds the maximum column width. Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided.
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PACKAGE MATERIALS INFORMATION www.ti.com 23-Sep-2013 TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Pins Type Drawing SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant LM63CIMAX/NOPB SOIC D 8 2500 330.0 12.4 6.5 5.4 2.0 8.0 12.0 Q1 LM63DIMAX/NOPB SOIC D 8 2500 330.0 12.4 6.5 5.4 2.0 8.0 12.
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PACKAGE MATERIALS INFORMATION www.ti.com 23-Sep-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) LM63CIMAX/NOPB SOIC D 8 2500 367.0 367.0 35.0 LM63DIMAX/NOPB SOIC D 8 2500 367.0 367.0 35.
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