SBOSA50A December   2021  – March 2022 TMP127-Q1

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 Diagrams
    8. 7.8 Typical Characteristics
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 Low Power Consumption
    4. 8.4 Device Functional Modes
      1. 8.4.1 Continuous Conversion Mode
      2. 8.4.2 Shutdown Mode
    5. 8.5 Programming
      1. 8.5.1 Temperature Data Format
      2. 8.5.2 Serial Bus Interface
        1. 8.5.2.1 Communication in Shutdown Mode
        2. 8.5.2.2 Communication in Continuous Conversion Mode
        3. 8.5.2.3 Internal Register Structure
  9. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Applications
      1. 9.2.1 Read-Only Configuration
        1. 9.2.1.1 Design Requirements
        2. 9.2.1.2 Detailed Design Procedure
      2. 9.2.2 Read/Write Configuration
        1. 9.2.2.1 Design Requirements
        2. 9.2.2.2 Detailed Design Procedure
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
  12. 12Device and Documentation Support
    1. 12.1 Receiving Notification of Documentation Updates
    2. 12.2 Support Resources
    3. 12.3 Trademarks
    4. 12.4 Electrostatic Discharge Caution
    5. 12.5 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

Package Options

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

9.2.1.2 Detailed Design Procedure

The TMP127-Q1 will convert temperature at a 200-ms interval with a maximum conversion period of 270 ms per the Section 7.5 table. Reading from the TMP127-Q1 faster than the conversion period can result in data being retrieved twice before new data is available. Therefore TI recommends to read from the TMP127-Q1 in intervals greater than the maximum conversion period (like every 300 ms, for example). Reading faster than the conversion period will not disrupt device operation and can safely be done if desired.

In the read-only configuration, the TMP127-Q1 is not connected to a controller PICO pin. Due to this if the SCLK pin were to continue to be clocked for the write portion of the transaction, the SIO pin would be floating and the write value undetermined. It is for this reason that TI recommends to only perform the first 16 clock cycles to read the TMP127-Q1 temperature date and pull CS high after, as shown in Figure 9-1. This will ensure the TMP127-Q1 is never written to with a floating input.