SWRU635 May   2025 CC2744R7-Q1 , CC2745P10-Q1 , CC2745R10-Q1 , CC2745R7-Q1

 

  1.   1
  2.   Description
  3.   Get Started
  4.   Features
  5.   Applications
  6.   6
  7. 1Evaluation Module Overview
    1. 1.1 Introduction
    2. 1.2 Kit Contents
    3. 1.3 Specification
    4. 1.4 Device Information
  8. 2Hardware
    1. 2.1 Power Requirements
    2. 2.2 Temperature Range
    3. 2.3 Energy Trace
    4. 2.4 Hardware and Debug Setup
      1. 2.4.1 Using a LaunchPad XDS110 Debug Probe
      2. 2.4.2 Using a Generic XDS110 Debug Probe, Including a Separate LaunchPad
    5. 2.5 BoosterPack Connector Pinout
    6. 2.6 XDS110 Interface Connector
    7. 2.7 Debug Interface Connector
    8. 2.8 Jumper Information
    9. 2.9 Push Buttons
  9. 3Advanced Use of the LaunchPad Hardware
    1. 3.1 External Antenna
    2. 3.2 XDS110 GPIOs
    3. 3.3 Reset Selection on BoosterPack Connector
    4. 3.4 I2C Pullup Resistors
  10. 4Software
    1. 4.1 Getting Started
    2. 4.2 Out of Box Demo
  11. 5Hardware Design Files
    1. 5.1 Reference Schematics
    2. 5.2 PCB Layouts
    3. 5.3 Bill of Materials (BOM)
  12. 6Compliance Information
    1. 6.1 CE Compliance
    2. 6.2 REACH Compliance
    3. 6.3 Waste Electrical and Electronic Equipment (WEEE) Compliance
  13. 7Additional Information
    1. 7.1 Trademarks
  14. 8References

3.4 I2C Pullup Resistors

The LP-EM-CC2745R10-Q1 supports the I2C port of the CC2745R10-Q1 device: pins DIO28 (SDA) and DIO27 (SCL). To use the I2C interface, 3.3KΩ pullup resistors have been added to the footprints designated by R66 and R67 on the LP-EM-CC2745R10-Q1 board. Adjustments to these values can be required as these resistors vary according to the bus length and other intrinsic characteristics. To properly do this calculation, consult the application note Understanding the I2C Bus.

LP-EM-CC2745R10-Q1 Location of R66 and R67Figure 3-5 Location of R66 and R67