SNIS141F October   2005  – October 2015 LM73

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
  6. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Temperature-to-Digital Converter Characteristics
    6. 6.6 Logic Electrical Characteristics- Digital DC Characteristics
    7. 6.7 Logic Electrical Characteristics- SMBus Digital Switching Characteristics
    8. 6.8 Typical Characteristics
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Power-On Reset
      2. 7.3.2 One-Shot Conversion
      3. 7.3.3 Temperature Data Format
      4. 7.3.4 SMBus Interface
      5. 7.3.5 ALERT Function
      6. 7.3.6 Communicating With the LM73
        1. 7.3.6.1 Reading from the LM73
        2. 7.3.6.2 Writing to the LM73
    4. 7.4 Device Functional Modes
      1. 7.4.1 Shutdown Mode
    5. 7.5 Register Map
      1. 7.5.1 LM73 Registers
        1. 7.5.1.1 Pointer Register
        2. 7.5.1.2 Temperature Data Register
        3. 7.5.1.3 Configuration Register
        4. 7.5.1.4 THIGH Upper-Limit Register
        5. 7.5.1.5 TLOW Lower-Limit Register
        6. 7.5.1.6 Control/Status Register
        7. 7.5.1.7 Identification Register
  8. 8 Application and Implementation
    1. 8.1 Application Information
      1. 8.1.1 Thermal Path Considerations
      2. 8.1.2 Output Considerations: Tight Accuracy, Resolution and Low Noise
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
      3. 8.2.3 Application Curve
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
  11. 11Device and Documentation Support
    1. 11.1 Community Resources
    2. 11.2 Trademarks
    3. 11.3 Electrostatic Discharge Caution
    4. 11.4 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

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6 Specifications

6.1 Absolute Maximum Ratings

over operating free-air temperature range (unless otherwise noted)(1)(2)
MIN NOM MAX UNIT
Supply Voltage −0.3 V to 6 V
Voltage at SMBCLK and SMBDAT pins −0.3 V to V 6 V
Voltage at All Other Pins −0.3 (VDD + 0.5) 6 V
Input Current at Any Pin(1) ±5 mA
Storage Temperature, Tstg −65 150 °C
(1) Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, which do not imply functional operation of the device at these or any other conditions beyond those indicated under Recommended Operating Conditions. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
(2) Soldering process must comply with Texas Instruments' Reflow Temperature Profile specifications. Refer to www.ti.com/packaging.. Reflow temperature profiles are different for lead-free and non-lead-free packages.

6.2 ESD Ratings

VALUE UNIT
V(ESD) Electrostatic discharge Human-body model (HBM), per ANSI/ESDA/JEDEC JS-001(1) ±2000 V
Machine Model ±200
(1) JEDEC document JEP155 states that 500-V HBM allows safe manufacturing with a standard ESD control process.

6.3 Recommended Operating Conditions

over operating free-air temperature range (unless otherwise noted)
MIN MAX UNIT
LM73CIMK-0, LM73CIMK-1 –40 150 °C
Supply Voltage Range (VDD) 2.7 5.5 V

6.4 Thermal Information

THERMAL METRIC(1) LM73 UNIT
DDC (SOT)
6 PINS
RθJA Junction-to-ambient thermal resistance 224 °C/W
RθJC(top) Junction-to-case (top) thermal resistance 89
(1) For more information about traditional and new thermal metrics, see the IC Package Thermal Metrics application report, SPRA953.

6.5 Temperature-to-Digital Converter Characteristics

Unless otherwise noted, these specifications apply for VDD = 2.7 V to 5.5 V. All limits TA = TJ = 25°C, unless otherwise noted. TA is the ambient temperature. TJ is the junction temperature.
PARAMETER TEST CONDITIONS MIN TYP MAX(3) UNIT
Accuracy (4) VDD = 2.7V
to
VDD = 4.5V		 TA = −10°C to 80°C TA = TJ =TMIN to TMAX ±1 °C
TA = −25°C to 115°C TA = TJ =TMIN to TMAX ±1.5 °C
TA = −40°C to 150°C TA = TJ =TMIN to TMAX ±2 °C
VDD > 4.5V
to
VDD = 5.5V		 TA = −10°C to 80°C TA = TJ =TMIN to TMAX ±1.5 °C
TA = −25°C to 115°C TA = TJ =TMIN to TMAX ±2 °C
TA = −40°C to 150°C TA = TJ =TMIN to TMAX ±2.5 °C
Resolution RES1 Bit = 0, RES0 Bit = 0 11 Bits
0.25 °C/LSB
RES1 Bit = 0, RES0 Bit = 1 12 Bits
0.125 °C/LSB
RES1 Bit = 1, RES0 Bit = 0 13 Bits
0.0625 °C/LSB
RES1 Bit = 1, RES0 Bit = 1 14 Bits
0.03125 °C/LSB
Temperature Conversion Time (5) RES1 Bit = 0, RES0 Bit = 0 10.1 ms
TA = TJ =TMIN to TMAX 14
RES1 Bit = 0, RES0 Bit = 1 20.2 ms
TA = TJ =TMIN to TMAX 28
RES1 Bit = 1, RES0 Bit = 0 40.4 ms
TA = TJ =TMIN to TMAX 56
RES1 Bit = 1, RES0 Bit = 1 80.8 ms
TA = TJ =TMIN to TMAX 112
Quiescent Current Continuous Conversion Mode, SMBus inactive 320 µA
TA = TJ =TMIN to TMAX 495
Shutdown, bus-idle timers on 120 µA
TA = TJ =TMIN to TMAX 175
Shutdown, bus-idle timers off 1.9 µA
TA = TJ =TMIN to TMAX 8
Power-On Reset Threshold Measured on VDD input, falling edge TA = TJ =TMIN to TMAX 0.9 V

6.6 Logic Electrical Characteristics- Digital DC Characteristics

Unless otherwise noted, these specifications apply for VDD = 2.7 V to 5.5 V. All limits TA = TJ = 25°C, unless otherwise noted. TA is the ambient temperature. TJ is the junction temperature.
PARAMETER TEST CONDITIONS MIN TYP(2) MAX(3) UNIT
SMBDAT, SMBCLK INPUTS
VIH Logical 1 Input Voltage TA = TJ =TMIN to TMAX 0.7 × VDD V
VIL Logical 0 Input Voltage TA = TJ =TMIN to TMAX 0.3 × VDD V
VIN;HYST SMBDAT and SMBCLK Digital Input Hysteresis 0.07 × VDD V
IIH Logical 1 Input Current VIN = VDD 0.01 µA
TA = TJ =TMIN to TMAX 2
IIL Logical 0 Input Current VIN = 0 V –0.01 µA
TA = TJ =TMIN to TMAX –2
CIN Input Capacitance 5 pF
SMBDAT, ALERT OUTPUTS
IOH High Level Output Current VOH = VDD 0.01 µA
TA = TJ =TMIN to TMAX 2
VOL SMBus Low Level Output Voltage IOL = 3 mA TA = TJ =TMIN to TMAX 0.4 V
ADDRESS INPUT
VIH;ADDRESS Address Pin High Input Voltage TA = TJ =TMIN to TMAX VDD – 0.100 V
VIL;ADDRESS Address Pin Low Input Voltage TA = TJ =TMIN to TMAX 0.100 V
IIH; ADDRESS Address Pin High Input Current VIN = VDD 0.01 µA
TA = TJ =TMIN to TMAX 2
IIL;ADDRESS Address Pin Low Input Current VIN = 0 V –0.01 µA
TA = TJ =TMIN to TMAX –2

6.7 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. All limits TA = TJ = 25°C, unless otherwise noted. See Figure 1.
PARAMETER TEST CONDITIONS MIN TYP(2) MAX(3) UNIT
fSMB SMBus Clock Frequency No minimum clock frequency if Time-Out feature is disabled. TA = TJ =TMIN to TMAX 400 kHz
tLOW SMBus Clock Low Time TA = TJ =TMIN to TMAX 300 ns
tHIGH SMBus Clock High Time TA = TJ =TMIN to TMAX 300 ns
tF;SMBO Output Fall Time (6) CL = 400 pF
IPULL-UP ≤ 3 mA		 TA = TJ =TMIN to TMAX 250 ns
tTIMEOUT SMBDAT and SMBCLK Time Low for Reset of Serial Interface (7) TA = TJ =TMIN to TMAX 15 45 ms
tSU;DAT Data In Setup Time to SMBCLK High TA = TJ =TMIN to TMAX 100 ns
tHD;DATI Data Hold Time: Data In Stable after SMBCLK Low TA = TJ =TMIN to TMAX 0 ns
tHD;DATO Data Hold Time: Data Out Stable after SMBCLK Low TA = TJ =TMIN to TMAX 30 ns
tHD;STA Start Condition SMBDAT Low to SMBCLK Low (Start condition hold before the first clock falling edge) TA = TJ =TMIN to TMAX 60 ns
tSU;STO Stop Condition SMBCLK High to SMBDAT Low (Stop Condition Setup) TA = TJ =TMIN to TMAX 50 ns
tSU;STA SMBus Repeated Start-Condition Setup Time, SMBCLK High to SMBDAT Low TA = TJ =TMIN to TMAX 50 ns
tBUF SMBus Free Time Between Stop and Start Conditions TA = TJ =TMIN to TMAX 1.2 µs
tPOR Power-On Reset Time (8) TA = TJ =TMIN to TMAX 1 ms
(1) When the input voltage (VI) at any pin exceeds the power supplies (VI < GND or VI > VDD), the current at that pin should be limited to 5 mA.
(2) Typicals are at TA = 25°C and represent most likely parametric norm.
(3) Limits are specified to AOQL (Average Outgoing Quality Level).
(4) Local temperature accuracy does not include the effects of self-heating. The rise in temperature due to self-heating is the product of the internal power dissipation of the LM73 and the thermal resistance.
(5) This specification is provided only to indicate how often temperature data is updated. The LM73 can be read at any time without regard to conversion state (and will yield last conversion result).
(6) The output fall time is measured from (VIH;MIN + 0.15V) to (VIL;MAX - 0.15V).
(7) Holding the SMBDAT and/or SMBCLK lines Low for a time interval greater than tTIMEOUT will reset the LM73's SMBus state machine, setting SMBDAT and SMBCLK pins to a high impedance state.
(8) Represents the time from VDD reaching the power-on-reset level to the LM73 communications being functional. After an additional time equal to one temperature conversion time, valid temperature is available in the Temperature Data Register.
LM73 20147809.gif Figure 1. SMBus Communication

6.8 Typical Characteristics

LM73 20147820.png Figure 2. Accuracy vs. Temperature
LM73 20147822.png Figure 4. Shutdown Current vs.Temperature
LM73 20147821.png Figure 3. Operating Current vs. Temperature
LM73 20147823.png Figure 5. Typical Output Noise