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LM92

www.ti.com

SNIS110D –MARCH 2000–REVISED MARCH 2013

±0.33°C Accurate, 12-Bit + Sign Temperature Sensor and Thermal Window Comparator

With Two-Wire Interface

Check for Samples: LM92

FEATURES

DESCRIPTION

The LM92 is a digital temperature sensor and thermal

• Window Comparison Simplifies Design of

window comparator with an I

C™ Serial Bus interface

ACPI-Compatible Temperature Monitoring and

and an accuracy of ±0.33°C. The window-comparator

Control

architecture of the LM92 eases the design of

• Serial Bus Interface

temperature control systems. The open-drain

Interrupt (INT) output becomes active whenever

• Separate Open-Drain Outputs for Interrupt and

temperature goes outside a programmable window,

Critical Temperature Shutdown

while a separate Critical Temperature Alarm

• Shutdown Mode to Minimize Power

(T_CRIT_A) output becomes active when the

Consumption

temperature exceeds a programmable critical limit.

• Up to Four LM92s can be Connected to a

The INT output can operate in either a comparator or

Single Bus

event mode, while the T_CRIT_A output operates in

comparator mode only.

• 12-Bit + Sign Output

The host can program both the upper and lower limits

• Operation up to 150°C

of the window as well as the critical temperature limit.

Programmable Hysteresis as well as a fault queue

APPLICATIONS

are available to minimize false tripping. Two pins (A0,

• HVAC

A1) are available for address selection. The sensor

• Medical Electronics

powers up with default thresholds of 2°C T

HYST

, 10°C

LOW

, 64°C T

HIGH

, and 80°C T_CRIT.

• Electronic Test Equipment

The LM92's 2.7V to 5.5V supply voltage range, Serial

• System Thermal Management

Bus interface, 12-bit + sign output, and full-scale

• Personal Computers

range of over 128°C make it ideal for a wide range of

• Office Electronics

applications. These include thermal management and

• Automotive

protection applications in personal computers,

electronic test equipment, office electronics,

automotive, medical and HVAC applications.

KEY SPECIFICATIONS

• Supply Voltage 2.7V to 5.5V

• Supply Current operating 350 μA (typ) 625 μA

(max) shutdown 5 μA (typ)

• Temperature Accuracy

– 30°C, ±0.33°C (max)

– 10°C to 50°C, ±0.50°C (max)

– −10°C to 85°C, ±1.0°C (max)

– 125°C, ±1.25°C (max)

– −25°C to 150°C, ±1.5°C (max)

• Linearity ±0.5°C (max)

• Resolution 0.0625°C

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.

C is a trademark of dcl_owner.

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 (25 pages)

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LM92 www.ti.com SNIS110D – MARCH 2000 – REVISED MARCH 2013 ±0.33°C Accurate, 12-Bit + Sign Temperature Sensor and Thermal Window Comparator With Two-Wire Interface Check for Samples: LM92 FEATURES DESCRIPTION • The LM92 is a digital temperature sensor and thermal window comparator with an I2C™ Serial Bus interface and an accuracy of ±0.33°C. The window-comparator architecture of the LM92 eases the design of temperature control systems.
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LM92 SNIS110D – MARCH 2000 – REVISED MARCH 2013 www.ti.com Simplified Block Diagram Connection Diagram SOIC See Package Number D (R-PDSO-G8) Pin Description Label Pin No. Function Typical Connection SDA 1 Serial Bi-Directional Data Line.
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LM92 www.ti.com SNIS110D – MARCH 2000 – REVISED MARCH 2013 Typical Application Figure 1. 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 6.5V Supply Voltage −0.3 V to (+VS + 0.
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LM92 SNIS110D – MARCH 2000 – REVISED MARCH 2013 www.ti.com Electrical Characteristics Temperature-to-Digital Converter Characteristics Unless otherwise noted, these specifications apply for +VS= +2.7V to +5.5V for LM92CIM . Boldface limits apply for TA = TJ = TMIN to TMAX; all other limits TA= TJ= +25°C, unless otherwise noted. Parameter Conditions Accuracy (This is a summary. For more detailed information please see (3)) Linearity ±0.33 T A = 10°C or +50°C, +VS = 3.3V to 4.0V ±0.
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LM92 www.ti.com SNIS110D – MARCH 2000 – REVISED MARCH 2013 Figure 3. Accuracy vs Temperature with +Vs = 3.3V Table 1. Temperature Accuracy Parameter Limits Conditions +VS=2.7V +VS=3.3V +VS=4V +VS=5V +VS=5.5V Unit T A = −25°C −1.35/+1.50 −1.25/+1.50 −1.25/+1.50 −1.05/+1.70 −1.05/+1.80 °C (max) T A = −10°C ±1.00 −0.90/+1.00 −0.90/+1.00 −0.70/+1.20 −0.70/+1.30 °C (max) T A = 0°C −0.80/+0.75 −0.70/+0.75 −0.70/+0.75 −0.50/+0.95 −0.50/+1.05 °C (max) T A = 10°C −0.60/+0.50 ±0.
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LM92 SNIS110D – MARCH 2000 – REVISED MARCH 2013 www.ti.com Digital DC Characteristics (continued) Unless otherwise noted, these specifications apply for +VS= +2.7V to +5.5V for LM92CIM . Boldface limits apply for TA = TJ = TMIN to TMAX; all other limits TA= TJ= +25 °C, unless otherwise noted. Symbol Parameter Conditions T_CRIT_A Output Saturation Voltage Typical (1) I OUT = 4.0 mA (3) T_CRIT_A Delay t OF Limits (2) Unit (Limit) 0.
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LM92 www.ti.com SNIS110D – MARCH 2000 – REVISED MARCH 2013 Figure 5.
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LM92 SNIS110D – MARCH 2000 – REVISED MARCH 2013 www.ti.com FUNCTIONAL DESCRIPTION The LM92 temperature sensor incorporates a band-gap type temperature sensor, 13-bit ADC, and a digital comparator with user-programmable upper and lower limit values. The comparator activates either the INT line for temperatures outside the TLOW and THIGH window, or the T_CRIT_A line for temperatures which exceed T_CRIT. The lines are programmable for mode and polarity.
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LM92 www.ti.com SNIS110D – MARCH 2000 – REVISED MARCH 2013 DEFAULT SETTINGS The LM92 always powers up in a known state. LM92 power up default conditions are: 1. Comparator Interrupt Mode 2. TLOW set to 10 °C 3. THIGH set to 64 °C 4. T_CRIT set to 80 °C 5. THYST set to 2 °C 6. INT and T_CRIT_A active low 7.
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LM92 SNIS110D – MARCH 2000 – REVISED MARCH 2013 www.ti.com Note: Event Interrupt mode is drawn as if the user is reading the part. If the user doesn't read, the outputs would go low and stay that way until the LM92 is read. Comparator Interrupt Mode is drawn as if the user never reads the part. If the user does read, the outputs will go high once read instruction is executed and, if the fault condition still exists, go low at the end of the next conversion. Figure 7.
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LM92 www.ti.com SNIS110D – MARCH 2000 – REVISED MARCH 2013 Table 2. Temperature Data Output (continued) Temperature Digital Output Binary Hex +0.0625 °C 0 0000 0000 0001 00 01h 0 °C 00 0000 0000 00 00h −0.0625 °C 1 1111 1111 1111 1F FFh −25 °C 1 1110 0111 0000 1E 70h −55 °C 1 1100 1001 0000 1C 90h SHUTDOWN MODE Shutdown mode is enabled by setting the shutdown bit in the Configuration register via the Serial Bus. Shutdown mode reduces power supply current to 5 µA typical.
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LM92 SNIS110D – MARCH 2000 – REVISED MARCH 2013 www.ti.com INTERNAL REGISTER STRUCTURE Figure 8. There are four data registers in the LM92, selected by the Pointer register. At power-up the Pointer is set to “00”; the location for the Temperature Register. The Pointer register latches the last location it was set to. In Interrupt Mode, a read from the LM92 resets the INT output. Placing the device in Shutdown mode resets the INT and T_CRIT_A outputs.
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LM92 www.ti.com SNIS110D – MARCH 2000 – REVISED MARCH 2013 Figure 9.
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LM92 SNIS110D – MARCH 2000 – REVISED MARCH 2013 www.ti.com THYST, TLOW, THIGH AND T_CRIT_A REGISTERS Table 5. (Read/Write): D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 Sign MSB Bit 10 Bit 9 Bit 8 Bit7 Bit6 Bit5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 X X X D0–D2: Undefined D3–D15: THYST, TLOW, THIGH or T_CRIT Trip Temperature Data. Power up default is TLOW = 10°C, THIGH = 64°C, T_CRIT = 80°C, THYST = 2°C. THYST is subtracted from THIGH, and T_CRIT, and added to TLOW.
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LM92 www.ti.com SNIS110D – MARCH 2000 – REVISED MARCH 2013 I2C TIMING DIAGRAMS Figure 10. Typical 2-Byte Read From Preset Pointer Location Such as Temp or Comparison Registers Figure 11. Typical Pointer Set Followed by Immediate Read for 2-Byte Register such as Temp or Comparison Registers Figure 12. Typical 1-Byte Read from Configuration Register with Preset Pointer Figure 13. Typical Pointer Set Followed by Immediate Read from Configuration Register Figure 14.
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LM92 SNIS110D – MARCH 2000 – REVISED MARCH 2013 www.ti.com APPLICATION HINTS The temperature response graph in Figure 16 depicts a typical application designed to meet ACPI requirements. In this type of application, the temperature scale is given an arbitrary value of "granularity", or the window within which temperature notification events should occur.
PAGE 17
LM92 www.ti.com SNIS110D – MARCH 2000 – REVISED MARCH 2013 Note: Event Interrupt mode is drawn as if the user is reading the part. If the user doesn't read, the outputs would go low and stay that way until the LM92 is read. Figure 16. Temperature Response Diagram for ACPI Implementation Typical Applications Figure 17.
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LM92 SNIS110D – MARCH 2000 – REVISED MARCH 2013 www.ti.com Figure 18. Remote HVAC temperature sensor communicates via 3 wires, including thermostat signals Figure 19. ACPI Compatible Terminal Alarm Shutdown By powering the LM92 from auxiliary output of the power supply, a non-functioning overheated computer can be powered down to preserve as much of the system as possible.
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LM92 www.ti.com SNIS110D – MARCH 2000 – REVISED MARCH 2013 REVISION HISTORY Changes from Revision C (March 2013) to Revision D • 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 Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties.
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PACKAGE MATERIALS INFORMATION www.ti.com 26-Mar-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 LM92CIMX SOIC D 8 2500 330.0 12.4 6.5 5.4 2.0 8.0 12.0 Q1 LM92CIMX/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 26-Mar-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) LM92CIMX SOIC D 8 2500 367.0 367.0 35.0 LM92CIMX/NOPB SOIC D 8 2500 367.0 367.0 35.
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