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LM86

www.ti.com

SNIS114E –DECEMBER 2001–REVISED MARCH 2013

±0.75°C Accurate, Remote Diode and Local Digital Temperature Sensor With Two-Wire

Interface

Check for Samples: LM86

FEATURES

DESCRIPTION

The LM86 is an 11-bit digital temperature sensor with

• Accurately Senses Die Temperature of Remote

a 2-wire System Management Bus (SMBus) serial

ICs or Diode Junctions

interface. The LM86 accurately measures its own

• Offset Register Allows Sensing a Variety of

temperature as well as the temperature of an external

Thermal Diodes Accurately

device, such as processor thermal diode or diode

connected transistor such as the 2N3904. The

• On-Board Local Temperature Sensing

temperature of any ASIC can be accurately

• 10-Bit Plus Sign Remote Diode Temperature

determined using the LM86 as long as a dedicated

Data Format, 0.125°C Resolution

diode (semiconductor junction) is available on the

• T_CRIT_A Output Useful for System Shutdown

target die. The LM86 remote sensor accuracy of

±0.75°C is factory trimmed for the 1.008 typical

• ALERT Output Supports SMBus 2.0 Protocol

nonideality factor of the mobile Pentium™ III thermal

• SMBus 2.0 Compatible Interface, Supports

diode. The LM86 has an Offset register to allow

TIMEOUT

measuring other diodes without requiring continuous

• 8-Pin VSSOP and SOIC Packages

software management. Contact

hardware.monitor.team@nsc.com to obtain the latest

APPLICATIONS

data for new processors.

• Computer System Thermal Management

Activation of the ALERT output occurs when any

(For Example, Laptop, Desktop, Workstations,

temperature goes outside a preprogrammed window

set by the HIGH and LOW temperature limit registers

Server)

or exceeds the T_CRIT temperature limit. Activation

• Electronic Test Equipment

of the T_CRIT_A occurs when any temperature

• Office Electronics

exceeds the T_CRIT programmed limit. The LM86 is

pin and register compatible with the the Analog

KEY SPECIFICATIONS

Devices ADM1032 and Maxim MAX6657/8.

• Supply Voltage 3.0V to 3.6V

• Supply Current 0.8mA (typ)

• Local Temp Accuracy (includes quantization

error)

– T

=25°C to 125°C, ±3.0°C (max)

• Remote Diode Temp Accuracy (includes

quantization error)

– T

=30°C, T

=80°C, ±0.75°C (max)

– T

=30°C to 50°C, T

=60°C to 100°C, ±1.0°C

(max)

– T

=0°C to 85°C, T

=25°C to 125°C, ±3.0°C

(max)

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.

2Pentium is a trademark 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 (33 pages)

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LM86 www.ti.com SNIS114E – DECEMBER 2001 – REVISED MARCH 2013 ±0.75°C Accurate, Remote Diode and Local Digital Temperature Sensor With Two-Wire Interface Check for Samples: LM86 FEATURES DESCRIPTION • The LM86 is an 11-bit digital temperature sensor with a 2-wire System Management Bus (SMBus) serial interface. The LM86 accurately measures its own temperature as well as the temperature of an external device, such as processor thermal diode or diode connected transistor such as the 2N3904.
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LM86 SNIS114E – DECEMBER 2001 – REVISED MARCH 2013 www.ti.com Simplified Block Diagram 3.0V-3.
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LM86 www.ti.
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LM86 SNIS114E – DECEMBER 2001 – REVISED MARCH 2013 www.ti.com These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates. Absolute Maximum Ratings (1) −0.3 V to 6.0 V Supply Voltage −0.5V to 6.0V Voltage at SMBData, SMBCLK, ALERT, T_CRIT_A −0.3 V to (VDD + 0.
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LM86 www.ti.com SNIS114E – DECEMBER 2001 – REVISED MARCH 2013 Operating Ratings Operating Temperature Range 0°C to +125°C Electrical Characteristics Temperature Range TMIN≤TA≤TMAX LM86 0°C≤TA≤+85°C Supply Voltage Range (VDD) +3.0V to +3.6V Temperature-to-Digital Converter Characteristics Unless otherwise noted, these specifications apply for VDD=+3.0Vdc to 3.6Vdc. Boldface limits apply for TA = TJ = TMIN≤TA≤TMAX; all other limits TA= TJ=+25°C, unless otherwise noted.
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LM86 SNIS114E – DECEMBER 2001 – REVISED MARCH 2013 www.ti.com Logic Electrical Characteristics DIGITAL DC CHARACTERISTICS Unless otherwise noted, these specifications apply for VDD=+3.0 to 3.6 Vdc. Boldface limits apply for TA = TJ = TMIN to TMAX; all other limits TA= TJ=+25°C, unless otherwise noted. Symbol Parameter Test Conditions Typical (1) Limits (2) Unit (Limit) SMBData, SMBCLK INPUTS VIN(1) Logical “1” Input Voltage 2.1 V (min) VIN(0) Logical “0”Input Voltage 0.
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LM86 www.ti.com SNIS114E – DECEMBER 2001 – REVISED MARCH 2013 SMBus DIGITAL SWITCHING CHARACTERISTICS (continued) 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 to TMAX; all other limits TA = TJ = +25°C, unless otherwise noted. The switching characteristics of the LM86 fully meet or exceed the published specifications of the SMBus version 2.0.
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LM86 SNIS114E – DECEMBER 2001 – REVISED MARCH 2013 www.ti.com FUNCTIONAL DESCRIPTION The LM86 temperature sensor incorporates a delta VBE based temperature sensor using a Local or Remote diode and a 10-bit plus sign ADC (Delta-Sigma Analog-to-Digital Converter). The LM86 is compatible with the serial SMBus version 2.0 two-wire interface.
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LM86 www.ti.com SNIS114E – DECEMBER 2001 – REVISED MARCH 2013 Each temperature reading (LT and RT) is associated with a T_CRIT setpoint register (LCS, RCS), a HIGH setpoint register (LHS and RHS) and a LOW setpoint register (LLS and RLS). At the end of every temperature reading, a digital comparison determines whether that reading is above its HIGH or T_CRIT setpoint or below its LOW setpoint. If so, the corresponding bit in the STATUS REGISTER is set.
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LM86 SNIS114E – DECEMBER 2001 – REVISED MARCH 2013 www.ti.com TEMPERATURE RDTS Measurement Remote High Limit LM86 ALERT pin ALERT mask set in response to reading of status register by master End of Temperature conversion Status Register: RTDS High TIME Figure 5. ALERT Output as an Interrupt Temperature Response Diagram ALERT Output as an SMBus ALERT When the ALERT output is connected to one or more ALERT outputs of other SMBus compatible devices and to a master, an SMBus alert line is created.
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LM86 www.ti.com SNIS114E – DECEMBER 2001 – REVISED MARCH 2013 The ARA, 000 1100, is a general call address. No device should ever be assigned this address. Bit D0 (the ALERT configure bit) in the FILTER and ALERT CONFIGURE REGISTER (xBF) must be set low in order for the LM86 to respond to the ARA command. The ALERT output can be disabled by setting the ALERT mask bit, D7, of the Configuration register. The power on default is to have the ALERT mask bit and the ALERT configure bit low.
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LM86 SNIS114E – DECEMBER 2001 – REVISED MARCH 2013 www.ti.com 4. Status Register set to 00h. 5. Configuration register set to 00h; ALERT enabled, Remote T_CRIT alarm enabled and Local T_CRIT alarm enabled 6. 85°C Local and Remote T_CRIT temperature setpoints 7. 70°C Local and Remote HIGH temperature setpoints 8. 0°C Local and Remote LOW temperature setpoints 9. Filter and Alert Configure Register set to 00h; filter disabled, ALERT output set as an SMBus ALERT 10.
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LM86 www.ti.com SNIS114E – DECEMBER 2001 – REVISED MARCH 2013 OPEN-DRAIN OUTPUTS The SMBData, ALERT and T_CRIT_A outputs are open-drain outputs and do not have internal pull-ups. A “high” level will not be observed on these pins until pull-up current is provided by some external source, typically a pullup resistor. Choice of resistor value depends on many system factors but, in general, the pull-up resistor should be as large as possible.
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LM86 SNIS114E – DECEMBER 2001 – REVISED MARCH 2013 www.ti.com SMBus Timing Diagrams Figure 8. (a) Serial Bus Write to the internal Command Register followed by a the Data Byte Figure 9. (b) Serial Bus Write to the Internal Command Register Figure 10.
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LM86 www.ti.com SNIS114E – DECEMBER 2001 – REVISED MARCH 2013 DIGITAL FILTER In order to suppress erroneous remote temperature readings due to noise, the LM86 incorporates a userconfigured digital filter. The filter is accessed in the FILTER and ALERT CONFIGURE REGISTER at BFh. The filter can be set according to the following table. D2 D1 Filter 0 0 No Filter 0 1 Level 1 1 0 Level 1 1 1 Level 2 Level 2 sets maximum filtering.
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LM86 SNIS114E – DECEMBER 2001 – REVISED MARCH 2013 www.ti.com Fault Queue TEMPERATURE In order to suppress erroneous ALERT or T_CRIT triggering the LM86 incorporates a Fault Queue. The Fault Queue acts to insure a remote temperature measurement is genuinely beyond a HIGH, LOW or T_CRIT setpoint by not triggering until three consecutive out of limit measurements have been made, see Figure 14.
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LM86 www.ti.com SNIS114E – DECEMBER 2001 – REVISED MARCH 2013 LM86 REGISTERS COMMAND REGISTER Selects which registers will be read from or written to. Data for this register should be transmitted during the Command Byte of the SMBus write communication.
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LM86 SNIS114E – DECEMBER 2001 – REVISED MARCH 2013 www.ti.com For RTLB D7–D5: Temperature Data. LSB = 0.125°C. Two's complement format. The maximum value available from the Local Temperature register is 127; the minimum value available from the Local Temperature register is -128. The maximum value available from the Remote Temperature register is 127.875; the minimum value available from the Remote Temperature registers is −128.875. STATUS REGISTER (SR) Table 4.
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LM86 www.ti.com SNIS114E – DECEMBER 2001 – REVISED MARCH 2013 CONVERSION RATE REGISTER Table 6. CONVERSION RATE REGISTER (Read Address 04h /Write Address 0Ah) Value Conversion Rate 00 62.5 mHz 01 125 mHz 02 250 mHz 03 500 mHz 04 1 Hz 05 2 Hz 06 4 Hz 07 8 Hz 08 16 Hz 09 32 Hz 10-255 Undefined LOCAL and REMOTE HIGH SETPOINT REGISTERS (LHS, RHSHB, and RHSLB) Table 7.
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LM86 SNIS114E – DECEMBER 2001 – REVISED MARCH 2013 www.ti.com REMOTE TEMPERATURE OFFSET REGISTERS (RTOHB and RTOLB) Table 11. REMOTE TEMPERATURE OFFSET REGISTERS (RTOHB) (Read/Write Address 11h): BIT D7 D6 D5 D4 D3 D2 D1 D0 Value SIGN 64 32 16 8 4 2 1 For RTOHB: Remote Temperature Offset High Byte. Power up default is LHIGH = RHIGH = 0°C. 1LSB = 1°C. Two's complement format. Table 12.
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LM86 www.ti.com SNIS114E – DECEMBER 2001 – REVISED MARCH 2013 Level 2 sets maximum filtering. D0: when set to "1" comparator mode is enabled. MANUFACTURERS ID REGISTER (Read Address FEh) Default value 01h. DIE REVISION CODE REGISTER (Read Address FFh) Default value 11hexadecimal or 17 decimal. This register will increment by 1 every time there is a revision to the die by National Semiconductor.
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LM86 SNIS114E – DECEMBER 2001 – REVISED MARCH 2013 www.ti.com APPLICATION HINTS The LM86 can be applied easily in the same way as other integrated-circuit temperature sensors, and its remote diode sensing capability allows it to be used in new ways as well. It can be soldered to a printed circuit board, and because the path of best thermal conductivity is between the die and the pins, its temperature will effectively be that of the printed circuit board lands and traces soldered to the LM86's pins.
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LM86 www.ti.com SNIS114E – DECEMBER 2001 – REVISED MARCH 2013 Vbe KVt IF = IS e (3) In the above equation, η and IS are dependant upon the process that was used in the fabrication of the particular diode. By forcing two currents with a very controlled ration (N) and measuring the resulting voltage difference, it is possible to eliminate the IS term.
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LM86 SNIS114E – DECEMBER 2001 – REVISED MARCH 2013 www.ti.com 14 1 Pentium 4 0.8 TEMPERATURE SHIFT (°C) 12 10 ERROR (oC) 8 6 4 Pentium III CPUID 68h/Celeron Pentium II 2 0 -2 -4 n_ideality =1.008 using LM84. 0.6 0.4 n_ideality =1.008 using LM86. 0.2 0 -0.2 -0.4 n_ideality =1.0045 using LM84. -0.6 -0.8 Pentium 4 -6 -60 -40 -20 0 20 40 60 80 100 120 140 -1 -60 -40 -20 0 TEMPERATURE (oC) TEMPERATURE (°C) Figure 16.
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LM86 www.ti.com SNIS114E – DECEMBER 2001 – REVISED MARCH 2013 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 LM86 can cause temperature conversion errors. Keep in mind that the signal level the LM86 is trying to measure is in microvolts. The following guidelines should be followed: 1. Place a 0.
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LM86 SNIS114E – DECEMBER 2001 – REVISED MARCH 2013 www.ti.com DATA SHEET REVISION HISTORY Date 4/2003 Revision 1. 2. 3. 4. 3/2013 26 Added improved guaranteed Temperature Error specification for the Remote Diode Readings of ±0.75ºC to page 1 and Electrical Characteristics. in DIE REVISION CODE REGISTER changed "21h" to "11hexadecimal or 17 decimal" Changed numbering of "Applications Hints" from "4." to "3." Added "Data Sheet Revision History" section.
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE OPTION ADDENDUM www.ti.com 1-Nov-2013 (5) Multiple Device Markings will be inside parentheses. Only one Device Marking contained in parentheses and separated by a "~" will appear on a device. If a line is indented then it is a continuation of the previous line and the two combined represent the entire Device Marking for that device. (6) Lead/Ball Finish - Orderable Devices may have multiple material finish options. Finish options are separated by a vertical ruled line.
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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 LM86CIMM VSSOP DGK 8 1000 178.0 12.4 5.3 3.4 1.4 8.0 12.0 Q1 LM86CIMM/NOPB VSSOP DGK 8 1000 178.0 12.4 5.3 3.4 1.4 8.0 12.0 Q1 LM86CIMMX/NOPB VSSOP DGK 8 3500 330.0 12.4 5.3 3.4 1.4 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) LM86CIMM VSSOP DGK 8 1000 210.0 185.0 35.0 LM86CIMM/NOPB VSSOP DGK 8 1000 210.0 185.0 35.0 LM86CIMMX/NOPB VSSOP DGK 8 3500 367.0 367.0 35.0 LM86CIMX SOIC D 8 2500 367.0 367.0 35.0 LM86CIMX/NOPB SOIC D 8 2500 367.0 367.0 35.
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