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LM95233

www.ti.com

SNIS145E –AUGUST 2006–REVISED MARCH 2013

LM95233 Dual Remote Diode and Local Temperature Sensor with SMBus Interface and

TruTherm™ Technology

Check for Samples: LM95233

FEATURES

KEY SPECIFICATIONS

• Accurately Senses Die Temperature of 2

• Local Temperature Accuracy: ±2.0 °C (max)

Remote ICs or Diode Junctions and Local

• Remote Diode Temperature Accuracy: ±0.875

Temperature

°C (max)

• TruTherm BJT Beta Compensation Technology

• Supply Voltage: 3.0 to 3.6 V

Accurately Senses Sub-Micron Process

• Average Supply Current (1Hz conversion rate):

Thermal Diodes

0.57 mA (typ)

• 0.125°C LSb Temperature Resolution

• 0.03125°C LSb Remote Temperature DESCRIPTION

Resolution with Digital Filter Enabled

LM95233 is an 11-bit digital temperature sensor with

a 2-wire System Management Bus (SMBus) interface

• +127.875°C/–128°C and 0°C/255°C Remote

that can monitor the temperature of two remote

Ranges

diodes as well as its own temperature. The LM95233

• Programmable Digital Filters and Analog Front

can be used to very accurately monitor the

End Filter

temperature of up to two external devices such as

• Remote Diode Fault Detection, Model

microprocessors, graphics processors or diode-

connected 2N3904s. The LM95233's TruTherm™

Selection and Offset Correction

BJT beta compensation technology allows sensing of

• Mask and Status Register Support

90nm or 65nm process thermal diodes accurately.

• 3 Programmable TCRIT Outputs with

The LM95233 reports temperature in two different

Programmable Shared Hysteresis

formats for +127.875°C/–128°C range and 0°C/255°C

• Programmable Conversion Rate and Shutdown

range. The LM95233 TCRIT1, TCRIT2 and TCRIT3

Mode One-Shot Conversion Control

outputs are triggered when any unmasked channel

• SMBus 2.0 Compatible Interface, Supports

exceeds its corresponding programmable limit and

can be used to shutdown the system, to turn on the

TIMEOUT

system fans or as a microcontroller interrupt function.

• Three-Level Address Pin

The current status of the TCRIT1, TCRIT2 and

• 14-Pin WSON Package

TCRIT3 pins can be read back from the status

registers. Mask registers are available for further

APPLICATIONS

control of the TCRIT outputs. LM95233's remote

temperature channels have programmable digital

• Processor/Computer System Thermal

filters to minimize unwanted TCRIT events when

Management (e.g. Laptop, Desktop,

temperature spikes are encountered.

Workstations, Server)

For optimum flexibility and accuracy each LM95233

• Electronic Test Equipment

channel includes, registers for sub-micron process or

• Office Electronics

2N3904 diode model selection as well as offset

correction. A three level address pin allows

connection of up to 3 LM95233s to the same SMBus

master. The LM95233 includes power saving

functions such as: programmable conversion rate,

shutdown mode, and turn off of unused channels.

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.

2TruTherm is a trademark of Texas Instruments.

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 (44 pages)

PAGE 1
LM95233 www.ti.com SNIS145E – AUGUST 2006 – REVISED MARCH 2013 LM95233 Dual Remote Diode and Local Temperature Sensor with SMBus Interface and TruTherm™ Technology Check for Samples: LM95233 FEATURES KEY SPECIFICATIONS • • • 1 23 • • • • • • • • • • • • Accurately Senses Die Temperature of 2 Remote ICs or Diode Junctions and Local Temperature TruTherm BJT Beta Compensation Technology Accurately Senses Sub-Micron Process Thermal Diodes 0.125°C LSb Temperature Resolution 0.
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LM95233 SNIS145E – AUGUST 2006 – REVISED MARCH 2013 www.ti.com Connection Diagram NC 1 14 TCRIT3 VDD 2 13 SMBCLK NC 3 12 SMBDAT NC 4 11 TCRIT2 D- 5 10 TCRIT1 D2+ 6 9 A0 D1+ 7 8 GND LM95233 Figure 1. 14-Lead WSON - TOP VIEW See NHL0014B Package Simplified Block Diagram 3.0V-3.
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LM95233 www.ti.com SNIS145E – AUGUST 2006 – REVISED MARCH 2013 PIN DESCRIPTIONS Label Pin # Function Typical Connection NC 1 No Connect Not connected. May be left floating, connected to GND or VDD. VDD 2 Positive Supply Voltage Input DC Voltage from 3.0 V to 3.6 V. VDD should be bypassed with a 0.1µF capacitor in parallel with 100pF. The 100pF capacitor should be placed as close as possible to the power supply pin.
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LM95233 SNIS145E – AUGUST 2006 – REVISED MARCH 2013 www.ti.com Typical Application +3.3V Standby C3 10 PF C2 0.1 PF C1* 100 pF 1 2 3 NC VDD NC 4 SO DIMM Q1 MMBT3904 NC 5 D6 D2+ C4** 100 pF 7 D1+ C5** 100 pF R1 10k R2 10k R3 R4 10k 1.3k R5 1.3k 14 TCRIT3 13 SMBCLK 12 SMBDAT 11 TCRIT2 10 TCRIT1 9 A0 8 GND SMBCLK SMBDAT SMBus Master LM95233 PROCESSOR * Note, place close to LM95233 pins. ** Note, optional - place close to LM95233 pins. These devices have limited built-in ESD protection.
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LM95233 www.ti.com SNIS145E – AUGUST 2006 – REVISED MARCH 2013 Operating Ratings (1) (2) (3) Operating Temperature Range −40°C to +140°C Electrical Characteristics Temperature Range TMIN ≤ TA ≤ TMAX −40°C ≤ TA ≤ +125°C LM95233CISD Supply Voltage Range (VDD) (1) (2) (3) +3.0V to +3.6V Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. DC and AC electrical specifications do not apply when operating the device beyond its rated operating conditions.
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LM95233 SNIS145E – AUGUST 2006 – REVISED MARCH 2013 www.ti.com Temperature-to-Digital Converter Electrical Characteristics (continued) 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. Parameter Quiescent Current Typical (1) Conditions (6) 570 Shutdown 360 µA 0.
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LM95233 www.ti.com SNIS145E – AUGUST 2006 – REVISED MARCH 2013 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 to TMAX; all other limits TA = TJ = +25°C, unless otherwise noted. The switching characteristics of the LM95233 fully meet or exceed the published specifications of the SMBus version 2.0.
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LM95233 SNIS145E – AUGUST 2006 – REVISED MARCH 2013 Pin # Label Circuit 1 NC – 2 VDD A 3 NC – www.ti.com Circuits for Pin ESD Protection Structure V+ D2 PIN 4 NC – 5 D- A 6 D2+ A 7 D1+ A 8 GND – 9 A0 B 10 TCRIT1 B 11 TCRIT2 B 12 SMBDAT B 13 SMBCLK B 14 TCRIT2 B D1 ESD CLAMP D3 6.5V GND Figure 3. Circuit A PIN D1 SNP 8 GND Figure 4.
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LM95233 www.ti.com SNIS145E – AUGUST 2006 – REVISED MARCH 2013 Typical Performance Characteristics Thermal Diode Capacitor or PCB Leakage Current Effect on Remote Diode Temperature Reading Conversion Rate Effect on Average Power Supply Current 4.0 VDD = +3.3V 3.5 AVERAGE IDD (mA) TA = 25°C 3.0 2.5 2.0 1.5 1.0 0.5 0.0 0.01 0.1 1 10 CONVERSION TIME (sec) Figure 5. Figure 6.
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LM95233 SNIS145E – AUGUST 2006 – REVISED MARCH 2013 www.ti.com FUNCTIONAL DESCRIPTION LM95233 is an 11-bit digital temperature sensor with a 2-wire System Management Bus (SMBus) interface that can monitor the temperature of two remote diodes as well as its own temperature. The LM95233 can be used to very accurately monitor the temperature of up to two external devices such as microprocessors, graphics processors or diode-connected 2N3904 transistor.
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LM95233 www.ti.com 6. 7. 8. 9.
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LM95233 SNIS145E – AUGUST 2006 – REVISED MARCH 2013 5. 6. 7. 8. www.ti.com Continuous conversion with all channels enabled, time = 1s Enhanced digital filter enabled for Remote 1 and 2 Status Registers depends on state of thermal diode inputs Local and Remote Temperature Limits for TCRIT1, TCRIT2 and TCRIT3 outputs: Output Pin Temperature Channel Limit TCRIT1 Remote 2 (°C) Remote 1 (°C) Local (°C) 110 110 Masked, 85 TCRIT2 85 85 85 TCRIT3 Masked, 85 Masked, 85 Masked, 85 1.
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LM95233 www.ti.com SNIS145E – AUGUST 2006 – REVISED MARCH 2013 Figure 11 describes the filter output in response to a step input and an impulse input. a) Seventeen and fifty degree step response b) Impulse response with input transients less than 4°C c) Impulse response with input transients great than 4°C Figure 11.
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LM95233 SNIS145E – AUGUST 2006 – REVISED MARCH 2013 www.ti.com Table 1. 11-bit, 2's Complement (10-bit plus sign) (continued) Temperature Digital Output Binary Hex 0°C 0000 0000 0000 0000 0000h −0.125°C 1111 1111 1110 0000 FFE0h −1°C 1111 1111 0000 0000 FF00h −25°C 1110 0111 0000 0000 E700h −55°C 1100 1001 0000 0000 C900h Table 2. 11-bit, Unsigned Binary Temperature Digital Output Binary Hex +255.
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LM95233 www.ti.com SNIS145E – AUGUST 2006 – REVISED MARCH 2013 Local Temperature data is only represented by an 11-bit, two's complement, word with an LSb equal to 0.125°C. Table 5. 11-bit, 2's Complement (10-bit plus sign) Temperature Digital Output Binary Hex +125°C 0111 1101 0000 0000 7D00h +25°C 0001 1001 0000 0000 1900h +1°C 0000 0001 0000 0000 0100h +0.125°C 0000 0000 0010 0000 0020h 0°C 0000 0000 0000 0000 0000h −0.
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LM95233 SNIS145E – AUGUST 2006 – REVISED MARCH 2013 www.ti.
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LM95233 www.ti.com SNIS145E – AUGUST 2006 – REVISED MARCH 2013 a) TCRIT1 Mask Register, Status Register 1 and 2, and TCRIT1 output logic diagram. b) TCRIT2 Mask Register, Status Register 1 and 3, and TCRIT2 output logic diagram. Status 1 (Diode Fault) Status 1 (Diode Fault) R2DO R2DO R2DS R2DS R1DO R1DO R1DS R1DS Status 2 (TCRIT1) Status 3 (TCRIT2) R2T1 R2T2 TCRIT1 R1T1 TCRIT2 R1T2 LT1 LT2 TCRIT1 Mask TCRIT2 Mask R2T1M R2T2M R1T1M R1T2M LTM LTM Figure 14.
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LM95233 SNIS145E – AUGUST 2006 – REVISED MARCH 2013 www.ti.com If enabled, remote temperature 1 is compared to the user programmable Remote 1 Tcrit-1 Limit Register (Default Value 110°C) and Remote 1 Tcrit-2 Limit Register (Default Value = 85°C). The result of this comparison is stored in Status Register 2, Status Register 3 and Status Register 4 (see Figure 13).
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LM95233 www.ti.com SNIS145E – AUGUST 2006 – REVISED MARCH 2013 A Write to the LM95233 will always include the address byte and the command byte. A write to any register requires one data byte. Reading the LM95233 can take place either of two ways: 1.
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LM95233 SNIS145E – AUGUST 2006 – REVISED MARCH 2013 www.ti.com 1 9 1 9 SMBCLK SMBDAT A6 A4 A5 A3 A2 D7 Ack by LM95233 A1 D6 A0 R/W Start by Master Frame 1 Serial Bus Address Byte D5 D4 D3 D2 D1 D0 NoAck Stop by by Master Master Frame 2 Data Byte from the LM95233 Figure 18. (c) Serial Bus Read from a Register with the Internal Command Register preset to desired value.
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LM95233 www.ti.com SNIS145E – AUGUST 2006 – REVISED MARCH 2013 LM95233 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. P7 P6 P5 P4 P3 P2 P1 P0 Command Byte P0-P7: Command Table 7.
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LM95233 SNIS145E – AUGUST 2006 – REVISED MARCH 2013 www.ti.com Table 7.
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LM95233 www.ti.
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LM95233 SNIS145E – AUGUST 2006 – REVISED MARCH 2013 www.ti.com Bit(s) Bit Name Read/ Write Description 7 SIGN RO bit weight 128°C 6 64 RO bit weight 64°C 5 32 RO bit weight 32°C 4 16 RO bit weight 16°C 3 8 RO bit weight 8°C 2 4 RO bit weight 4°C 1 2 RO bit weight 2°C 0 1 RO bit weight 1°C Bit(s) Bit Name Read/ Write Description 7 1/2 RO bit weight 1/2°C (0.5°C) 6 1/4 RO bit weight 1/4°C (0.25°C) 5 1/8 RO bit weight 1/8°C (0.
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LM95233 www.ti.
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LM95233 SNIS145E – AUGUST 2006 – REVISED MARCH 2013 www.ti.com Channel Conversion Enable When a conversion is disabled for a particular channel it is skipped. The continuous conversion rate is effected all other conversion rates are not effected as extra standby time is inserted in order to compensate. See Conversion Rate Register description.
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LM95233 www.ti.com SNIS145E – AUGUST 2006 – REVISED MARCH 2013 Bit(s) Bit Name Read/ Write Description 7–0 - WO Writing to this register activates one conversion for all the enabled channels if the chip is in standby mode (i.e. standby bit = 1). The actual data written does not matter and is not stored.
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LM95233 SNIS145E – AUGUST 2006 – REVISED MARCH 2013 www.ti.com Status 2 (TCRIT1) Status bits for TCRIT1. When one or more of these bits are set and if not masked the TCRIT1 output will activate. TCRIT1 will deactivate when all these bits are cleared. Register Name Command Read/ Byte Write (Hex) Status 2 (TCRIT1) 0x08 RO D7 D6 D5 D4 D3 D2 D1 D0 POR Default (Hex) – – – – – R2T1 R1T1 LT1 – Bit(s) Bit Name Read/ Write Description 7–3 - RO Reserved – will report "0" when read.
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LM95233 www.ti.com SNIS145E – AUGUST 2006 – REVISED MARCH 2013 Status 4 (TCRIT3) Status bits for TCRIT3. When one or more of these bits are set and if not masked the TCRIT3 output will activate. TCRIT3 will deactivate when all these bits are cleared. Register Name Command Read/ Byte Write (Hex) Status 4 (TCRIT3) 0x0A RO D7 D6 D5 D4 D3 D2 D1 D0 POR Default (Hex) – – – – – R2T3 R1T3 LT3 – Bit(s) Bit Name Read/ Write Description 7–3 - RO Reserved – will report "0" when read.
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LM95233 SNIS145E – AUGUST 2006 – REVISED MARCH 2013 www.ti.com TCRIT1 Mask Register The mask bits in this register allow control over which error events propagate to the TCRIT1 pin. Register Name Command Read/ Byte Write (Hex) TCRIT1 Mask 0x0C R/W D7 D6 D5 D4 D3 D2 D1 D0 POR Default (Hex) – – – – – R2T1 M R1T1 M LTM 0x01 Bit(s) Bit Name Read/ Write Description 7-3 – RO Reserved – will report "0" when read.
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LM95233 www.ti.
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LM95233 SNIS145E – AUGUST 2006 – REVISED MARCH 2013 www.ti.com Bit(s) Bit Name Read/ Write Description 0 1 R/W bit weight 1°C Table 8.
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LM95233 www.ti.com SNIS145E – AUGUST 2006 – REVISED MARCH 2013 The LM95233’s TruTherm BJT beta compensation technology allows accurate sensing of integrated thermal diodes, such as those found on most processors. With TruTherm BJT beta compensation technology turned off, the LM95233 can measure a diode-connected transistor such as the MMBT3904 or the thermal diode found in an AMD processor.
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LM95233 SNIS145E – AUGUST 2006 – REVISED MARCH 2013 www.ti.com TruTherm BJT beta compensation technology uses the transistor equation, Equation 6, which is a more accurate representation of the topology of the thermal diode found in an FPGA or processor. T= q x 'VBE §I · K x k x ln¨¨ C2 ¸ © IC1 ¹ (6) 7 IE = IF D1+ 100 pF PROCESSOR IC IR 5 MMBT3904 IR D- 100 pF 6 D2+ IF LM95233 Figure 20.
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LM95233 www.ti.com SNIS145E – AUGUST 2006 – REVISED MARCH 2013 The next error term to be discussed is that due to the series resistance of the thermal diode and printed circuit board traces. The thermal diode series resistance is specified on most processor data sheets. For Intel processors in 65 nm process, this is specified at 4.52Ω typical. The LM95233 accommodates the typical series resistance of Intel Processor on 65 nm process.
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LM95233 SNIS145E – AUGUST 2006 – REVISED MARCH 2013 TCF = www.ti.com § KS - KPROCESSOR · x (TCR + 273K) KS © ¹ where • • • ηS = LM95233 non-ideality for accuracy specification ηPROCESSOR = Processor thermal diode typical non-ideality TCR = center of the temperature range of interest in °C (11) The correction factor should be directly added to the temperature reading produced by the LM95233.
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LM95233 www.ti.com SNIS145E – AUGUST 2006 – REVISED MARCH 2013 nano-amperes of leakage can cause as much as 0.2°C of error in the diode temperature reading. Keeping the printed circuit board as clean as possible will minimize leakage current. Noise coupling into the digital lines greater than 400 mVp-p (typical hysteresis) and undershoot less than 500 mV below GND, may prevent successful SMBus communication with the LM95233.
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LM95233 SNIS145E – AUGUST 2006 – REVISED MARCH 2013 www.ti.com REVISION HISTORY Changes from Revision D (March 2013) to Revision E • 38 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 continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals. TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release.
PAGE 41
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 LM95233CISD WSON NHL 14 1000 178.0 12.4 4.3 4.3 1.3 8.0 12.0 Q1 LM95233CISD/NOPB WSON NHL 14 1000 178.0 12.4 4.3 4.3 1.3 8.0 12.0 Q1 LM95233CISDX/NOPB WSON NHL 14 4500 330.0 12.4 4.3 4.3 1.3 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) LM95233CISD WSON NHL 14 1000 210.0 185.0 35.0 LM95233CISD/NOPB WSON NHL 14 1000 210.0 185.0 35.0 LM95233CISDX/NOPB WSON NHL 14 4500 367.0 367.0 35.
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MECHANICAL DATA NHL0014B SDA14B (Rev A) www.ti.
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IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other changes to its semiconductor products and services per JESD46, latest issue, and to discontinue any product or service per JESD48, latest issue. Buyers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.