SNIS140F May 2006  – September 2015 LM94022 , LM94022-Q1

PRODUCTION DATA. 

  1. Features
  2. Applications
  3. Description
  4. Revision History
  5. Pin Configuration and Functions
  6. Specifications
    1. 6.1Absolute Maximum Ratings
    2. 6.2ESD Ratings
    3. 6.3Recommended Operating Conditions
    4. 6.4Thermal Information
    5. 6.5Electrical Characteristics
    6. 6.6Typical Characteristics
  7. Detailed Description
    1. 7.1Overview
    2. 7.2Functional Block Diagram
    3. 7.3Feature Description
      1. 7.3.1LM94022/-Q1 Transfer Function Gain Selection
    4. 7.4Device Functional Modes
      1. 7.4.1Capacitive Loads
      2. 7.4.2Output Voltage Shift
      3. 7.4.3Selectable Gain for Optimization and in Situ Testing
  8. Application and Implementation
    1. 8.1Application Information
    2. 8.2Typical Application
      1. 8.2.1Design Requirements
      2. 8.2.2Detailed Design Procedure
      3. 8.2.3Application Curve
    3. 8.3System Examples
      1. 8.3.1Application Circuits
  9. Power Supply Recommendations
  10. 10Layout
    1. 10.1Layout Guidelines
      1. 10.1.1Mounting and Thermal Conductivity
    2. 10.2Layout Example
    3. 10.3Output and Noise Considerations
  11. 11Device and Documentation Support
    1. 11.1Related Links
    2. 11.2Community Resources
    3. 11.3Trademarks
    4. 11.4Electrostatic Discharge Caution
    5. 11.5Glossary
  12. 12Mechanical, Packaging, and Orderable Information

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1 Features

  • LM94022/-Q1 is AEC-Q100 Grade 0 qualified and is Manufactured on an Automotive Grade Flow
  • Low 1.5-V to 5.5-V Operation With Low 5.4-µA Supply Current
  • Push-Pull Output With ±50-µA Source Current Capability
  • Four Selectable Gains
  • Very Accurate Over Wide Temperature Range of −50°C to +150°C:
    • ±1.5ºC Temperature Accuracy for 20ºC to 40ºC Range
    • ±1.8ºC Temperature Accuracy for –50ºC to 70ºC Range
    • ±2.1ºC Temperature Accuracy for –50ºC to 90ºC Range
    • ±2.7ºC Temperature Accuracy for –50ºC to 150ºC Range
  • Output is Short-Circuit Protected
  • Extremely Small SC70 Package
  • For the Similar Functionality in a TO-92 Package, See LMT84, LMT85, LMT86, or LMT87
  • Footprint Compatible With the Industry-Standard LM20 Temperature Sensor

2 Applications

  • Automotive
  • Cell Phones
  • Wireless Transceivers
  • Battery Management
  • Disk Drives
  • Games
  • Appliances

3 Description

The LM94022/-Q1 device is a precision analog output CMOS integrated-circuit temperature sensor with selectable linear negative temperature coefficient (NTC). A class-AB output structure gives the LM94022/-Q1 strong output source and sink current capability for driving heavy transient loads such as that presented by the input of a sample-and-hold analog-to-digital converter. The low 5.4-µA supply current and 1.5-V operating voltage of the LM94022/-Q1 make it ideal for battery-powered systems as well as general temperature-sensing applications.

The Gain Select 1 (GS1) and Gain Select 0 (GS0) logic inputs select one of four gains for the temperature-to-voltage output transfer function: −5.5 mV/°C, −8.2 mV/°C, −10.9 mV/°C, and −13.6 mV/°C. Selecting –5.5 mV/°C (GS1 and GS0 both tied low), allows the LM94022/-Q1 to operate down to 1.5-V supply while measuring temperature over the full range of −50°C to +150°C. Maximum temperature sensitivity, –13.6 mV/°C, is selected when GS1 and GS0 are both tied high. The gain-select inputs can be tied directly to VDD or Ground without any pullup or pulldown resistors, reducing component count and board area. These inputs can also be driven by logic signals allowing the system to optimize the gain during operation or system diagnostics.

Device Information(1)

PART NUMBERPACKAGEBODY SIZE (NOM)
LM94022 SC70 (5)2.00 mm × 1.25 mm
LM94022-Q1
  1. For all available packages, see the orderable addendum at the end of the data sheet.

Full-Range Celsius Temperature Sensor (–50°C to +150°C) Operating from a Single Cell Battery

LM94022 LM94022-Q1 20143002.gif

Output Temperature Characteristic

LM94022 LM94022-Q1 20143024.png