SWAS034A February   2017  – May 2021 CC3120

PRODUCTION DATA  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Functional Block Diagrams
  5. 5 Revision History
  6. 6 Device Comparison
    1. 6.1 Related Products
  7. 7 Terminal Configuration and Functions
    1. 7.1 Pin Diagram
    2. 7.2 Pin Attributes
    3. 7.3 Connections for Unused Pins
  8. 8 Specifications
    1. 8.1  Absolute Maximum Ratings
    2. 8.2  ESD Ratings
    3. 8.3  Power-On Hours (POH)
    4. 8.4  Recommended Operating Conditions
    5. 8.5  Current Consumption Summary
    6. 8.6  TX Power and IBAT versus TX Power Level Settings
    7. 8.7  Brownout and Blackout Conditions
    8. 8.8  Electrical Characteristics (3.3 V, 25°C)
    9. 8.9  WLAN Receiver Characteristics
    10. 8.10 WLAN Transmitter Characteristics
    11. 8.11 WLAN Filter Requirements
      1. 8.11.1 WLAN Filter Requirements
    12. 8.12 Thermal Resistance Characteristics
      1. 8.12.1 Thermal Resistance Characteristics for RGK Package
    13. 8.13 Reset Requirement
    14. 8.14 Timing and Switching Characteristics
      1. 8.14.1 Power Supply Sequencing
      2. 8.14.2 Device Reset
      3. 8.14.3 Reset Timing
        1. 8.14.3.1 nRESET (32-kHz Crystal)
        2. 8.14.3.2 First-Time Power-Up and Reset Removal Timing Requirements (32-kHz Crystal)
        3. 8.14.3.3 nRESET (External 32-kHz)
          1. 8.14.3.3.1 First-Time Power-Up and Reset Removal Timing Requirements (External 32-kHz)
      4. 8.14.4 Wakeup From HIBERNATE Mode
        1. 8.14.4.1 nHIB Timing Requirements
      5. 8.14.5 Clock Specifications
        1. 8.14.5.1 Slow Clock Using Internal Oscillator
          1. 8.14.5.1.1 RTC Crystal Requirements
        2. 8.14.5.2 Slow Clock Using an External Clock
          1. 8.14.5.2.1 External RTC Digital Clock Requirements
        3. 8.14.5.3 Fast Clock (Fref) Using an External Crystal
          1. 8.14.5.3.1 WLAN Fast-Clock Crystal Requirements
        4. 8.14.5.4 Fast Clock (Fref) Using an External Oscillator
          1. 8.14.5.4.1 External Fref Clock Requirements (–40°C to +85°C)
      6. 8.14.6 Interfaces
        1. 8.14.6.1 Host SPI Interface Timing
          1. 8.14.6.1.1 Host SPI Interface Timing Parameters
        2. 8.14.6.2 Flash SPI Interface Timing
          1. 8.14.6.2.1 Flash SPI Interface Timing Parameters
    15. 8.15 External Interfaces
      1. 8.15.1 SPI Flash Interface
        1. 8.15.1.1 SPI Flash Interface
      2. 8.15.2 SPI Host Interface
        1. 8.15.2.1 SPI Host Interface
      3. 8.15.3 Host UART Interface
        1. 8.15.3.1 SimpleLink™ UART Configuration
        2. 8.15.3.2 5-Wire UART Topology
        3. 8.15.3.3 4-Wire UART Topology
        4. 8.15.3.4 3-Wire UART Topology
  9. 9 Detailed Description
    1. 9.1 Device Features
      1. 9.1.1 WLAN
      2. 9.1.2 Network Stack
      3. 9.1.3 Security
      4. 9.1.4 Host Interface and Driver
      5. 9.1.5 System
    2. 9.2 Power-Management Subsystem
      1. 9.2.1 VBAT Wide-Voltage Connection
      2. 9.2.2 Preregulated 1.85V
    3. 9.3 Low-Power Operating Modes
      1. 9.3.1 Low-Power Deep Sleep
      2. 9.3.2 Hibernate
      3. 9.3.3 Shutdown
    4. 9.4 Memory
      1. 9.4.1 External Memory Requirements
    5. 9.5 Restoring Factory Default Configuration
  10. 10Applications, Implementation, and Layout
    1. 10.1 Application Information
      1. 10.1.1 Typical Application—CC3120R Wide-Voltage Mode
      2. 10.1.2 Typical Application Schematic—CC3120R Preregulated, 1.85-V Mode
    2. 10.2 PCB Layout Guidelines
      1. 10.2.1 General PCB Guidelines
      2. 10.2.2 Power Layout and Routing
        1. 10.2.2.1 Design Considerations
      3. 10.2.3 Clock Interfaces
      4. 10.2.4 Digital Input and Output
      5. 10.2.5 RF Interface
  11. 11Device and Documentation Support
    1. 11.1 Development Tools and Software
    2. 11.2 Firmware Updates
    3. 11.3 Device Nomenclature
    4. 11.4 Documentation Support
    5. 11.5 Support Resources
    6. 11.6 Trademarks
    7. 11.7 Electrostatic Discharge Caution
    8. 11.8 Export Control Notice
    9. 11.9 Glossary
  12. 12Mechanical, Packaging, and Orderable Information
    1. 12.1 Packaging Information

9.4.1 External Memory Requirements

The CC3120R device maintains a proprietary file system on the serial flash. The CC3120R file system stores the service pack file, system files, configuration files, certificate files, web page files, and user files. By using a format command through the API, users can provide the total size allocated for the file system. The starting address of the file system cannot be set and is always at the beginning of the serial flash. The applications microcontroller must access the serial flash memory area allocated to the file system directly through the CC3120R file system. The applications microcontroller must not access the serial flash memory area directly.

The file system manages the allocation of serial flash blocks for stored files according to download order, which means that the location of a specific file is not fixed in all systems. Files are stored on serial flash using human-readable filenames rather than file IDs. The file system API works using plain text, and file encryption and decryption is invisible to the user. Encrypted files can be accessed only through the file system.

All file types can have a maximum of 100 supported files in the file system. All files are stored in 4-KB blocks and thus use a minimum of 4KB of Flash space. Fail-safe files require twice the original size and use a minimum of 8KB. Encrypted files are counted as fail-safe in terms of space. The maximum file size is 1MB.

Table 9-2 lists the minimum required memory consumption under the following assumptions:

  • System files in use consume 64 blocks (256KB).
  • Vendor files are not taken into account.
  • Gang image:
    • Storage for the gang image is rounded up to 32 blocks (meaning 128KB resolution).
    • Gang image size depends on the actual content size of all components. Additionally, the image should be 128KB aligned so unaligned memory is considered lost. Service pack, system files, and the 128KB aligned memory are assumed to occupy 256KB.
  • All calculations consider that the restore-to-default is enabled.

Table 9-2 Recommended Flash Size
ITEMCC3120 [KB]
File system allocation table20
System and configuration files256
Service Pack264
Gang image size256
Total796
Minimal Flash size8MBit
Recommended Flash size16MBit

 

Note:

The maximum supported serial flash size is 32MB (256Mb). See the Using Serial Flash on CC3120/CC3220 SimpleLink™ Wi-Fi® and Internet-of-Things Devices application report.