SNIS209C July   2021  – June 2022 TMP126

PRODUCTION DATA  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Device Comparison
  6. 6 Pin Configuration and Functions
  7. 7 Specifications
    1. 7.1 Absolute Maximum Ratings
    2. 7.2 ESD Ratings
    3. 7.3 Recommended Operating Conditions
    4. 7.4 Thermal Information
    5. 7.5 Electrical Characteristics
    6. 7.6 SPI Interface Timing
    7. 7.7 Timing Diagram
    8. 7.8 Typical Characteristics
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Descriptions
      1. 8.3.1 Temperature Limits
      2. 8.3.2 Slew Rate Warning
      3. 8.3.3 Cyclic Redundancy Check (CRC)
      4. 8.3.4 NIST Traceability
      5. 8.3.5 Fast Measurement Intervals With No Self-Heating Concerns
    4. 8.4 Device Functional Modes
      1. 8.4.1 Continuous Conversion Mode
      2. 8.4.2 Shutdown Mode
      3. 8.4.3 One-Shot Mode
      4. 8.4.4 Interrupt and Comparator Mode
        1. 8.4.4.1 Interrupt Mode
        2. 8.4.4.2 Comparator Mode
    5. 8.5 Programming
      1. 8.5.1 Temperature Data Format
      2. 8.5.2 Serial Bus Interface
        1. 8.5.2.1 Command Word Structure
          1. 8.5.2.1.1 Don't Care
          2. 8.5.2.1.2 CRC Enable
          3. 8.5.2.1.3 CRC Data Block Length
          4. 8.5.2.1.4 Auto Increment
          5. 8.5.2.1.5 Read/Write
          6. 8.5.2.1.6 Sub-Address
        2. 8.5.2.2 Communication
        3. 8.5.2.3 Write Operations
        4. 8.5.2.4 Read Operations
        5. 8.5.2.5 Cyclic Redundancy Check (CRC)
          1. 8.5.2.5.1 Cyclic Redundancy Check Implementation
    6. 8.6 Register Map
  9. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Application
      1. 9.2.1 Design Requirements
      2. 9.2.2 Detailed Design Procedure
      3. 9.2.3 Application Curve
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
  12. 12Device and Documentation Support
    1. 12.1 Documentation Support
      1. 12.1.1 Related Documentation
    2. 12.2 Receiving Notification of Documentation Updates
    3. 12.3 Support Resources
    4. 12.4 Trademarks
    5. 12.5 Electrostatic Discharge Caution
    6. 12.6 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

8.4.1 Continuous Conversion Mode

When the Mode bit is set to 0 in the Configuration register, the device operates in continuous conversion mode. Figure 8-4 shows that the device continuously performs temperature conversions in this mode. The TMP126 does not wait until the end of the conversion period to update the temperature, instead the temperature result register is updated at the end of the temperature conversion. After a completed active conversion, the Data_Ready flag bit is set to 1. The user can read the interrupt/status register or the temperature result register to clear the Data_Ready flag. Therefore, the Data_Ready_Flag can be used to determine when the conversion completes so that an external controller can synchronize reading the result register with conversion result updates. The user can set the Data_Ready_Flag_En bit in the configuration register to monitor the state of the Data_Ready_Flag on the ALERT pin.

Every conversion period consists of an active temperature conversion followed by a standby period. During standby the TMP126 will de-activate all measurement circuitry to conserve power but will remain available for any SPI communication. The device typically consumes 75 µA during the temperature conversion and only 1 µA during the low-power standby period. The duration of the temperature conversion will remain fixed, but the conversion period can be configured using the Conv_Period[2:0] bit field in the Configuration register, allowing the average current consumption of the device to be optimized based on the application requirements. Changing the conversion period also affects the temperature result update rate due to the temperature result register being updated at the end of every temperature conversion.

Use Equation 1 to calculate the average current consumption of the device in continuous conversion mode.

Equation 1. GUID-4E232438-7358-4948-AA82-B61E4788227E-low.gif
GUID-88AF8B81-FFAA-4C97-89CC-7320C507FFB7-low.gifFigure 8-4 Conversion Period Timing Diagram