Datasheet

ManualsBrandsTEXAS INSTRUMENTS ManualsPMICsLM95214CISD/NOPB

LM95214

www.ti.com

SNIS146A –MARCH 2007–REVISED MARCH 2013

Quad Remote Diode and Local Temperature Sensor with SMBus Interface

Check for Samples: LM95214

FEATURES

APPLICATIONS

• Accurately Senses Die Temperature of 4

• Processor/Computer System Thermal

Remote ICs or Diode Junctions and Local Management

Temperature

– (e.g. Laptop, Desktop, Workstations,

• Programmable Digital Filters and Analog Front Server)

End Filter

• Electronic Test Equipment

• 0.125°C LSb Temperature Resolution

• Office Electronics

• 0.03125°C LSb Remote Temperature

Resolution with Digital Filter Enabled DESCRIPTION

The LM95214 is an 11-bit digital temperature sensor

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

with a 2-wire System Management Bus (SMBus)

Ranges

interface that can very accurately monitor the

• Remote Diode Fault Detection, Model

temperature of four remote diodes as well as its own

Selection and Offset Correction

temperature. The four remote diodes can be external

• Mask and Status Register Support

devices such as microprocessors, graphics

processors that target the ideality of a 2N3904

• 3 Programmable TCRIT Outputs with

transistor or diode-connected 2N3904s.

Programmable Shared Hysteresis and Fault-

Queue

The LM95214 reports temperature in two different

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

• Programmable Conversion Rate and Shutdown

range. The LM95214 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

TIMEOUT

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

• Three-level Address Pin

system fans or as a microcontroller interrupt function.

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

KEY SPECIFICATIONS

control of the TCRIT outputs.

• Local Temperature Accuracy ±2.0°C (max)

Two LM95214 remote temperature channels have

• Remote Diode Temperature Accuracy ±1.1°C

programmable digital filters while the other two

(Max)

remote channels utilize a fault-queue to minimize

unwanted TCRIT events when temperature spikes

• Supply Voltage 3.0V to 3.6V

are encountered.

• Average Supply Current (1Hz Conversion

Rate) 0.57 mA (Typ)

For optimum flexibility and accuracy, each LM95214

channel includes registers for offset correction. A

three-level address pin allows connection of up to 3

LM95214s to the same SMBus master. The LM95214

includes power saving functions such as:

programmable conversion rate, shutdown mode, and

disabling 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.

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 (44 pages)

PAGE 1
LM95214 www.ti.com SNIS146A – MARCH 2007 – REVISED MARCH 2013 Quad Remote Diode and Local Temperature Sensor with SMBus Interface Check for Samples: LM95214 FEATURES APPLICATIONS • • 1 23 • • • • • • • • • • • Accurately Senses Die Temperature of 4 Remote ICs or Diode Junctions and Local Temperature Programmable Digital Filters and Analog Front End Filter 0.125°C LSb Temperature Resolution 0.03125°C LSb Remote Temperature Resolution with Digital Filter Enabled +127.
PAGE 2
LM95214 SNIS146A – MARCH 2007 – REVISED MARCH 2013 www.ti.com Connection Diagram NC 1 14 TCRIT3 VDD 2 13 SMBCLK D4+ 3 12 SMBDAT D3+ 4 11 TCRIT2 TCRIT1 LM95214 D- 5 10 D2+ 6 9 A0 D1+ 7 8 GND Figure 1. WSON-14 TOP VIEW Simplified Block Diagram 3.0V-3.
PAGE 3
LM95214 www.ti.com SNIS146A – MARCH 2007 – 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 3.0V to 3.6V. VDD should be bypassed with a 0.1 µF capacitor in parallel with 100 pF. The 100 pF capacitor should be placed as close as possible to the power supply pin.
PAGE 4
LM95214 SNIS146A – MARCH 2007 – REVISED MARCH 2013 www.ti.com Typical Application +3.3V Standby C3 10 PF C2 0.1 PF C1* 100 pF C4** 100 pF Ambient Board Q1 MMBT3904 C5** 100 pF Q2 MMBT3904 Processor ASIC C6** 100 pF 1 NC 2 VDD 3 D4+ 4 D3+ 5 D6 D2+ 7 D1+ R1 10k 14 TCRIT3 13 SMBCLK 12 SMBDAT 11 TCRIT2 10 TCRIT1 9 A0 8 GND R2 R3 10k 10k R4 1.3k R5 1.3k SMBCLK SMBDAT SMBus Master LM95214 C7** 100 pF * Note, place close to LM95214 pins. ** Note, optional - place close to LM95214 pins.
PAGE 5
LM95214 www.ti.com SNIS146A – MARCH 2007 – REVISED MARCH 2013 Absolute Maximum Ratings (1) −0.3 to 6.0V Supply Voltage −0.5 to 6.0 Voltage at SMBDAT, SMBCLK, TCRIT1, TCRIT2, TCRIT3 −0.3 to (VDD + 0.
PAGE 6
LM95214 SNIS146A – MARCH 2007 – 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.
PAGE 7
LM95214 www.ti.com SNIS146A – MARCH 2007 – REVISED MARCH 2013 Logic Electrical Characteristics (continued) DIGITAL DC CHARACTERISTICS Unless otherwise noted, these specifications apply for VDD = +3.0Vdc to 3.6Vdc. Boldface limits apply for TA = TJ = TMIN to TMAX; all other limits TA= TJ=+25°C, unless otherwise noted.
PAGE 8
LM95214 SNIS146A – MARCH 2007 – REVISED MARCH 2013 www.ti.com tLOW tR SMBCL K VIL tBUF SMBDA T tF VIH tHD;STA tHIGH tSU;STA tSU;DAT tHD;DAT tSU;STO VIH VIL P S P Figure 2. SMBus Communication 8 Pin # Label Circuit 1 NC – 2 VDD A 3 D4+ A 4 D3+ A 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 Circuits for Pin ESD Protection Structure V+ D2 PIN D1 D3 6.
PAGE 9
LM95214 www.ti.com SNIS146A – MARCH 2007 – REVISED MARCH 2013 Typical Performance Characteristics 3.0 Thermal Diode Capacitor or PCB Leakage Current Effect on Remote Diode Temperature Reading Conversion Rate Effect on Average Power Supply Current VDD = +3.3V AVERAGE I DD (mA) 2.5 TA = 25°C 2.0 1.5 1.0 0.5 0.0 100 1000 10000 CONVERSION TIME (ms) Figure 3. Figure 4. Remote Temperature Reading Sensitivity to Thermal Diode Filter Capacitance Figure 5.
PAGE 10
LM95214 SNIS146A – MARCH 2007 – REVISED MARCH 2013 www.ti.com FUNCTIONAL DESCRIPTION The LM95214 is an 11-bit digital temperature sensor with a 2-wire System Management Bus (SMBus) interface that can monitor the temperature of four remote diodes as well as its own temperature. The LM95214 can be used to very accurately monitor the temperature of up to four external devices such as microprocessors, graphics processors or diode-connected 2N3904 transistor.
PAGE 11
LM95214 www.ti.com SNIS146A – MARCH 2007 – REVISED MARCH 2013 5. Status Registers – Main Status Register (Busy bit, Not Ready, Status Register 1 to 4 Flags) – Status 1 (diode fault) – Status 2 (TCRIT1) – Status 3 (TCRIT2) – Status 4 (TCRIT3) 6. Mask Registers – TCRIT1 Mask – TCRIT2 Mask – TCRIT3 Mask 7.
PAGE 12
LM95214 SNIS146A – MARCH 2007 – REVISED MARCH 2013 1. 2. 3. 4. 5. 6. 7. www.ti.
PAGE 13
LM95214 www.ti.com SNIS146A – MARCH 2007 – REVISED MARCH 2013 R1F[1:0] or R2F[1:0] Filter Setting 0 0 No Filter 0 1 Filter (equivalent to Level 2 filter of the LM86/LM89) 1 0 Reserved 1 1 Enhanced Filter (Filter with transient noise clipping) Figure 7, Figure 8, andFigure 9 describe the filter output in response to a step input and an impulse input. Figure 7. Seventeen and fifty degree step response Figure 8. Impulse response with input transients less than 4°C Figure 9.
PAGE 14
LM95214 SNIS146A – MARCH 2007 – REVISED MARCH 2013 www.ti.com FAULT QUEUE In order to suppress erroneous TCRIT1,TCRIT2 and TCRIT3 triggering the LM95214 incorporates a Fault Queue for the unfiltered remote channels 3 and 4. The Fault Queue acts to ensure the remote temperature measurement of these channels is genuinely beyond the corresponding Tcrit limit by not triggering until three consecutive out of limit measurements have been made, see Figure 11 for an example.
PAGE 15
LM95214 www.ti.com SNIS146A – MARCH 2007 – REVISED MARCH 2013 Table 2. 11-bit, unsigned binary Temperature Digital Output Binary Hex +255.875°C 1111 1111 1110 0000 FFE0h +255°C 1111 1111 0000 0000 FF00h +201°C 1100 1001 0000 0000 C900h +125°C 0111 1101 0000 0000 7D00h +25°C 0001 1001 0000 0000 1900h +1°C 0000 0001 0000 0000 0100h +0.
PAGE 16
LM95214 SNIS146A – MARCH 2007 – REVISED MARCH 2013 www.ti.com 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.
PAGE 17
LM95214 www.ti.
PAGE 18
LM95214 SNIS146A – MARCH 2007 – REVISED MARCH 2013 www.ti.com Status 1 (Diode Fault) Status 1 (Diode Fault) R4DO R4DO R4DS R4DS R3DO R3DO R3DS R3DS R2DO R2DO R2DS R2DS R1DO R1DO R1DS R1DS Status 2 (TCRIT1) Status 3 (TCRIT2) R4T1 R4T2 R3T1 R3T2 R2T1 TCRIT1 R2T2 R1T1 R1T2 LT1 LT2 TCRIT1 Mask TCRIT2 Mask R4TM R4TM R3TM R3TM R2T1M R2T2M R1T1M R1T2M LTM LTM TCRIT2 Figure 13. TCRIT1 Mask Register, Status Register 1 Figure 14.
PAGE 19
LM95214 www.ti.com SNIS146A – MARCH 2007 – REVISED MARCH 2013 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 12).
PAGE 20
LM95214 SNIS146A – MARCH 2007 – REVISED MARCH 2013 www.ti.com COMMUNICATING with the LM95214 The data registers in the LM95214 are selected by the Command Register. At power-up the Command Register is set to “00”, the location for the Read Local Temperature Register. The Command Register latches the last location it was set to. Each data register in the LM95214 falls into one of three types of user accessibility: 1. Read only 2. Write only 3.
PAGE 21
LM95214 www.ti.com SNIS146A – MARCH 2007 – REVISED MARCH 2013 1 9 1 9 SMBCLK SMBDAT A6 A4 A5 A2 A3 D7 Ack by LM95214 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 LM95214 Figure 19.
PAGE 22
LM95214 SNIS146A – MARCH 2007 – REVISED MARCH 2013 P7 www.ti.com P6 P5 P4 P3 P2 P1 P0 Command Byte P0-P7: Command Table 7.
PAGE 23
LM95214 www.ti.com SNIS146A – MARCH 2007 – REVISED MARCH 2013 Table 7.
PAGE 24
LM95214 SNIS146A – MARCH 2007 – REVISED MARCH 2013 www.ti.
PAGE 25
LM95214 www.ti.
PAGE 26
LM95214 SNIS146A – MARCH 2007 – REVISED MARCH 2013 www.ti.com Bit(s) Bit Name Read/ Write Description 7 SIGN R/W Sign bit 6 32 R/W bit weight 32°C 5 16 R/W bit weight 16°C 4 8 R/W bit weight 8°C 3 4 R/W bit weight 4°C 2 2 R/W bit weight 2°C 1 1 R/W bit weight 1°C 0 1/2 R/W bit weight 1/2°C (0.5°C) All registers have 2’s complement format. The offset range for each remote is +63.5°C/−64°C.
PAGE 27
LM95214 www.ti.com SNIS146A – MARCH 2007 – REVISED MARCH 2013 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.
PAGE 28
LM95214 SNIS146A – MARCH 2007 – REVISED MARCH 2013 www.ti.com 1-Shot Register Name Command Read/ Byte Write (Hex) 1-Shot 0x0F WO D7 D6 D5 D4 D3 D2 D1 D0 POR Default (Hex) – – – – – – – – – 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.
PAGE 29
LM95214 www.ti.
PAGE 30
LM95214 SNIS146A – MARCH 2007 – REVISED MARCH 2013 www.ti.com Status 3 (TCRIT2) Status bits for TCRIT2. When one or more of these bits are set and if not masked the TCRIT2 output will activate. TCRIT2 will deactivate when all these bits are cleared.
PAGE 31
LM95214 www.ti.
PAGE 32
LM95214 SNIS146A – MARCH 2007 – REVISED MARCH 2013 www.ti.
PAGE 33
LM95214 www.ti.com SNIS146A – MARCH 2007 – REVISED MARCH 2013 Bit(s) Bit Name Read/ Write Description 4 16 R/W bit weight 16°C 3 8 R/W bit weight 8°C 2 4 R/W bit weight 4°C 1 2 R/W bit weight 2°C 0 1 R/W bit weight 1°C Remote Limit Registers The range for these registers is 0°C to 255°C.
PAGE 34
LM95214 SNIS146A – MARCH 2007 – REVISED MARCH 2013 www.ti.com Common Tcrit Hysteresis Register The hysteresis register range is 0°C to 32°C. The value programmed in this register is used to modify all the limit values for decreasing temperature.
PAGE 35
LM95214 www.ti.com SNIS146A – MARCH 2007 – REVISED MARCH 2013 DIODE NON-IDEALITY Diode Non-Ideality Factor Effect on Accuracy When a transistor is connected as a diode, the following relationship holds for variables VBE, T and IF: ª §KVxBEV · º IF = IS x «e© t ¹ -1» « ¬ » ¼ where • • • • • • • • Vt = kT q q = 1.6×10−19 Coulombs (the electron charge) T = Absolute Temperature in Kelvin k = 1.
PAGE 36
LM95214 SNIS146A – MARCH 2007 – REVISED MARCH 2013 www.ti.com 7 IE = IF D1+ 100 pF ASIC IC IR 5 MMBT3904 IR 100 pF D- 6 IF D2+ LM95214 Figure 21. Thermal Diode Current Paths TruTherm technology can be found in the LM95234 four channel remote diode sensor that is pin and register compatible with the LM95214. The LM95214 does not support this technology. Calculating Total System Accuracy The voltage seen by the LM95214 also includes the IFRS voltage drop of the series resistance.
PAGE 37
LM95214 www.ti.com SNIS146A – MARCH 2007 – REVISED MARCH 2013 Diode Equation ηD, non-ideality Processor Family Pentium™ III CPUID 67h Series R,Ω min typ max 1 1.0065 1.0125 Pentium III CPUID 68h/PGA370Socket/ Celeron 1.0057 1.008 1.0125 Pentium 4, 423 pin 0.9933 1.0045 1.0368 Pentium 4, 478 pin 0.9933 1.0045 1.0368 Pentium 4 on 0.13 micron process, 2 - 3.06 GHz 1.0011 1.0021 1.0030 3.64 Pentium 4 on 90 nm process 1.0083 1.011 1.023 3.33 Intel Processor on 65 nm process 1.
PAGE 38
LM95214 SNIS146A – MARCH 2007 – REVISED MARCH 2013 www.ti.com PCB LAYOUT FOR MINIMIZING NOISE Figure 22. 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 LM95214 can cause temperature conversion errors. Keep in mind that the signal level the LM95214 is trying to measure is in microvolts. The following guidelines should be followed: 1.
PAGE 39
LM95214 www.ti.com SNIS146A – MARCH 2007 – REVISED MARCH 2013 REVISION HISTORY Changes from Original (March 2013) to Revision A • Page Changed layout of National Data Sheet to TI format ..........................................................................................................
PAGE 40
PACKAGE OPTION ADDENDUM www.ti.
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 LM95214CISD/NOPB WSON NHL 14 1000 178.0 12.4 4.3 4.3 1.3 8.0 12.0 Q1 LM95214CISDX/NOPB WSON NHL 14 4500 330.0 12.4 4.3 4.3 1.3 8.0 12.
PAGE 42
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) LM95214CISD/NOPB WSON NHL 14 1000 210.0 185.0 35.0 LM95214CISDX/NOPB WSON NHL 14 4500 367.0 367.0 35.
PAGE 43
MECHANICAL DATA NHL0014B SDA14B (Rev A) www.ti.
PAGE 44
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.