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LM73

SMBDAT

SMBCLK

ADDR

= 2.7V to 5.5V

Typical bypass 0.1 PF

To hardware

shutdown

To / from processor

2-wire interface

Address (set as desired for one

of three addresses)

ALERT

LM73

www.ti.com

SNIS141D –OCTOBER 2005–REVISED MAY 2009

LM73 2.7V, SOT, 11-to-14 Bit Digital Temperature Sensor with 2-Wire Interface

Check for Samples: LM73

FEATURES

KEY SPECIFICATIONS

• Single Address Pin Offers Choice of Three

• Supply Voltage: 2.7V to 5.5V

Selectable Addresses per Version for a Total

• Supply Current:

of Six Possible Addresses.

– Operating:

• SMBus and I

C-Compatible Two-Wire Interface

– 320 µA (typ)

• Supports 400 kHz Operation

– 495 µA (max)

• Shutdown Mode with One-Shot Feature

– Shutdown:

Available for Very Low Average Power

– 8 µA (max)

Consumption

– 1.9 µA (typ)

• Programmable Digital Temperature Resolution

• Temperature Accuracy:

from 11 Bits to 14 Bits.

– -10°C to 80°C: ±1.0°C (max)

• Fast Conversion Rate Ideal for Quick Power

Up and Measuring Rapidly Changing – -25°C to 115°C: ±1.5°C (max)

Temperature

– -40°C to 150°C: ±2.0°C (max)

• Open-Drain ALERT Output Pin Goes Active

• Resolution: 0.25°C to 0.03125°C

When Temperature is Above a Programmed

• Conversion Time:

Temperature Limit

– 11-bit (0.25°C): 14 ms (max)

• Very Stable, Low-Noise Digital Output.

– 14-bit (0.03125°C): 112 ms (max)

• UL Recognized Component

DESCRIPTION

APPLICATIONS

The LM73 is an integrated, digital-output temperature

• Portable Electronics

sensor featuring an incremental Delta-Sigma ADC

with a two-wire interface that is compatible with the

• Notebook Computers

SMBus and I

C interfaces. The host can query the

• Automotive

LM73 at any time to read temperature.

• System Thermal Management

• Office Electronics

Typical Application

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.

2All 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 (26 pages)

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LM73 www.ti.com SNIS141D – OCTOBER 2005 – REVISED MAY 2009 LM73 2.7V, SOT, 11-to-14 Bit Digital Temperature Sensor with 2-Wire Interface Check for Samples: LM73 FEATURES KEY SPECIFICATIONS • • • 1 2 • • • • • • • • Single Address Pin Offers Choice of Three Selectable Addresses per Version for a Total of Six Possible Addresses.
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LM73 SNIS141D – OCTOBER 2005 – REVISED MAY 2009 www.ti.com DESCRIPTION (CONTINUED) Available in a 6-pin SOT package, the LM73 occupies very little board area while operating over a wide temperature range (-40°C to 150°C) and providing ±1.0°C accuracy from -10°C to 80°C. The user can optimize between the conversion time and the sensitivity of the LM73 by programming it to report temperature in any of four different resolutions. Defaulting to 11-bit mode (0.
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LM73 www.ti.com SNIS141D – OCTOBER 2005 – REVISED MAY 2009 Connection Diagram ADDR 1 GND 2 VDD 3 LM73 6 SMBDAT 5 ALERT 4 SMBCLK Figure 1. SOT-6 (TOP VIEW) PIN DESCRIPTIONS Label Pin # Type ADDR 1 CMOS Logic Input (three levels) Equivalent Circuit Function VDD PIN Snap Back D1 2.5k D2 Address Select Input: One of three device addresses is selected by connecting to ground, left floating, or connecting to VDD.
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LM73 SNIS141D – OCTOBER 2005 – REVISED MAY 2009 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 −0.3 V to 6.0 V Voltage at SMBCLK and SMBDAT pins −0.3 V to (VDD + 0.5 V) and ≤ 6.
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LM73 www.ti.com SNIS141D – OCTOBER 2005 – REVISED MAY 2009 TEMPERATURE-TO-DIGITAL CONVERTER CHARACTERISTICS (continued) Unless otherwise noted, these specifications apply for VDD = 2.7V to 5.5V. Boldface limits apply for TA = TJ =TMIN to TMAX; all other limits TA = TJ = +25°C, unless otherwise noted. TA is the ambient temperature. TJ is the junction temperature. Typical (1) LM73C Limits (2) Units (Limit) RES1 Bit = 0, RES0 Bit = 0 10.1 14 ms (max) RES1 Bit = 0, RES0 Bit = 1 20.
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LM73 SNIS141D – OCTOBER 2005 – REVISED MAY 2009 www.ti.com LOGIC ELECTRICAL CHARACTERISTICS - SMBus DIGITAL SWITCHING CHARACTERISTICS Unless otherwise noted, these specifications apply for VDD = +2.7 V to +5.5 V, CL (load capacitance) on output lines = 400 pF. Boldface limits apply for TA = TJ = TMIN to TMAX; all other limits TA = TJ = +25°C, unless otherwise noted.
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LM73 www.ti.com SNIS141D – OCTOBER 2005 – REVISED MAY 2009 TYPICAL PERFORMANCE CHARACTERISTICS Accuracy vs. Temperature Operating Current vs. Temperature Figure 3. Figure 4. Shutdown Current vs. Temperature Typical Output Noise Figure 5. Figure 6.
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LM73 SNIS141D – OCTOBER 2005 – REVISED MAY 2009 www.ti.com FUNCTIONAL DESCRIPTION The LM73 is a digital temperature sensor that senses the temperature of its die using a sigma-delta analog-todigital converter and stores the temperature in the Temperature Register. The LM73's 2-wire serial interface is compatible with SMBus 2.0 and I2C. Please see the SMBus 2.0 specification for a detailed description of the differences between the I2C bus and SMBus.
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LM73 www.ti.com SNIS141D – OCTOBER 2005 – REVISED MAY 2009 TEMPERATURE DATA FORMAT The resolution of the temperature data and the size of the data word are user-selectable through bits RES1 and RES0 in the CONTROL/STATUS REGISTER. By default, the LM73 temperature stores the measured temperature in an 11-bit (10 bits plus sign) word with one least significant bit (LSB) equal to 0.25°C. The maximum word size is 14 bits (13-bits plus sign) with a resolution of 0.03125 °C/LSB.
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LM73 SNIS141D – OCTOBER 2005 – REVISED MAY 2009 www.ti.com Table 3. 13-bit (12-bit plus Sign) Temperature Digital Output Binary Hex +150°C 0100 1011 0000 0000 4B00h +25°C 0000 1100 1000 0000 0C80h +1°C 0000 0000 1000 0000 0080h +0.0625°C 0000 0000 0000 1000 0008h 0°C 0000 0000 0000 0000 0000h −0.0625°C 1111 1111 1111 1000 FFF8h −1°C 1111 1111 1000 0000 FF80h −25°C 1111 0011 1000 0000 F380h −40°C 1110 1100 0000 0000 EC00h Table 4.
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LM73 www.ti.com SNIS141D – OCTOBER 2005 – REVISED MAY 2009 ALERT FUNCTION The ALERT output is an over-temperature indicator. At the end of every temperature conversion, the measured temperature is compared to the value in the THIGH Register. If the measured temperature exceeds the value stored in THIGH, the ALERT output goes active (see Figure 7).
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LM73 SNIS141D – OCTOBER 2005 – REVISED MAY 2009 www.ti.com COMMUNICATING WITH THE LM73 The data registers in the LM73 are selected by the Pointer Register. At power-up the Pointer Register is set to “00h”, the location for the Temperature Register. The Pointer Register latches the last location it was set to. Note that all Pointer Register bits are decoded; any incorrect pointer values will not be acknowledged and will not be stored in the Pointer Register.
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LM73 www.ti.
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LM73 SNIS141D – OCTOBER 2005 – REVISED MAY 2009 www.ti.
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LM73 www.ti.com SNIS141D – OCTOBER 2005 – REVISED MAY 2009 LM73 REGISTERS The LM73's internal registers are selected by the Pointer register. The Pointer register latches the last location that it was set to. The pointer register and all internal registers are described below. All registers reset at device power up. POINTER REGISTER The diagram below shows the Pointer Register, the six internal registers to which it points, and their associated pointer addresses.
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LM73 SNIS141D – OCTOBER 2005 – REVISED MAY 2009 (1) www.ti.com P2 P1 P0 REGISTER (1) 0 0 0 Temperature 0 0 1 Configuration 0 1 0 THIGH 0 1 1 TLOW 1 0 0 Control / Status 1 1 1 Identification A write to an invalid pointer address is not allowed. If the master writes an invalid address to the Pointer Register, (a) the LM73 will not acknowledge the address and (b) the Pointer Register will continue to contain the last value stored in it.
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LM73 www.ti.com SNIS141D – OCTOBER 2005 – REVISED MAY 2009 THIGH UPPER-LIMIT REGISTER Pointer Address 02h (R/W) Reset State: 7FE0h (+255.75°C) D15 D14 D13 D12 D11 D10 D9 D8 SIGN 128°C 64°C 32°C 16°C 8°C 4°C 2°C D4 D3 D2 D1 D0 D7 D6 D5 1°C 0.5°C 0.
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LM73 SNIS141D – OCTOBER 2005 – REVISED MAY 2009 www.ti.com CONTROL/STATUS REGISTER Pointer Address 04h (R/W) Reset State: 08h D7 D6 D5 D4 D3 D2 D1 D0 TO_DIS RES1 RES0 reserved ALRT_STAT THI TLOW DAV Bits Name Description 7 Time-Out Disable Disable the time-out feature on the SMBDAT and SMBCLK lines if set to 1. Setting this bit turns off the bus-idle timers, enabling the LM73 to operate at lowest shutdown current.
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LM73 www.ti.com SNIS141D – OCTOBER 2005 – REVISED MAY 2009 APPLICATION HINTS THERMAL PATH CONSIDERATIONS To get the expected results when measuring temperature with an integrated circuit temperature sensor like the LM73, it is important to understand that the sensor measures its own die temperature. For the LM73, the best thermal path between the die and the outside world is through the LM73's pins. In the SOT package, all the pins on the LM73 will have an equal effect on the die temperature.
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE MATERIALS INFORMATION www.ti.com 14-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 LM73CIMK-0/NOPB SOT DDC 6 1000 178.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3 LM73CIMK-1/NOPB SOT DDC 6 1000 178.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3 LM73CIMKX-0/NOPB SOT DDC 6 3000 178.0 8.4 3.2 3.2 1.4 4.0 8.
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PACKAGE MATERIALS INFORMATION www.ti.com 14-Mar-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) LM73CIMK-0/NOPB SOT DDC 6 1000 210.0 185.0 35.0 LM73CIMK-1/NOPB SOT DDC 6 1000 210.0 185.0 35.0 LM73CIMKX-0/NOPB SOT DDC 6 3000 210.0 185.0 35.0 LM73CIMKX-1/NOPB SOT DDC 6 3000 210.0 185.0 35.
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