SWRS111G June   2011  – January 2026 CC1121

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Functional Diagram
  6. 5 Terminal Configuration and Functions
    1. 5.1 Pin Diagram
    2. 5.2 Pin Configuration
  7. 6 Specifications
    1. 6.1  Absolute Maximum Ratings #GUID-8A1DE4F5-4E49-477E-A98C-459BEC46A38F/LIT19484635 #GUID-8A1DE4F5-4E49-477E-A98C-459BEC46A38F/LIT89009562
    2. 6.2  Handling Ratings
    3. 6.3  Recommended Operating Conditions (General Characteristics)
    4. 6.4  Thermal Resistance Characteristics for RHB Package
    5. 6.5  RF Characteristics
    6. 6.6  Regulatory Standards
    7. 6.7  Current Consumption, Static Modes
    8. 6.8  Current Consumption, Transmit Modes
      1. 6.8.1 950-MHz Band (High-Performance Mode)
      2. 6.8.2 868-, 915-, and 920-MHz Bands (High-Performance Mode)
      3. 6.8.3 434-MHz Band (High-Performance Mode)
      4. 6.8.4 169-MHz Band (High-Performance Mode)
      5. 6.8.5 Low-Power Mode
    9. 6.9  Current Consumption, Receive Modes
      1. 6.9.1 High-Performance Mode
      2. 6.9.2 Low-Power Mode
    10. 6.10 Receive Parameters
      1. 6.10.1 General Receive Parameters (High-Performance Mode)
      2. 6.10.2 RX Performance in 950-MHz Band (High-Performance Mode)
      3. 6.10.3 RX Performance in 868-, 915-, and 920-MHz Bands (High-Performance Mode)
      4. 6.10.4 RX Performance in 434-MHz Band (High-Performance Mode)
      5. 6.10.5 RX Performance in 169-MHz Band (High-Performance Mode)
      6. 6.10.6 RX Performance in Low-Power Mode
    11. 6.11 Transmit Parameters
    12. 6.12 PLL Parameters
      1. 6.12.1 High-Performance Mode
      2. 6.12.2 Low-Power Mode
    13. 6.13 Timing Requirements
    14. 6.14 32-MHz Crystal Oscillator
    15. 6.15 32-MHz Clock Input (TCXO)
    16. 6.16 32-kHz Clock Input
    17. 6.17 32-kHz RC Oscillator
    18. 6.18 I/O and Reset
    19. 6.19 Temperature Sensor
    20. 6.20 44
    21. 6.21 Typical Characteristics
  8. 7 Detailed Description
    1. 7.1  Block Diagram
    2. 7.2  Frequency Synthesizer
    3. 7.3  Receiver
    4. 7.4  Transmitter
    5. 7.5  Radio Control and User Interface
    6. 7.6  Enhanced Wake-On-Radio (eWOR)
    7. 7.7  Sniff Mode
    8. 7.8  Antenna Diversity
    9. 7.9  Low-Power and High-Performance Mode
    10. 7.10 WaveMatch
  9. 8 Typical Application Circuit
  10. 9 Device and Documentation Support
    1. 9.1 Device and Development-Support Tool Nomenclature
    2. 9.2 Development Support
      1. 9.2.1 Configuration Software
    3. 9.3 Documentation Support
    4. 9.4 Receiving Notification of Documentation Updates
    5. 9.5 Support Resources
    6. 9.6 Trademarks
    7. 9.7 Electrostatic Discharge Caution
    8. 9.8 Glossary
    9. 9.9 Third-Party Products Disclaimer
  11. 10Revision History
  12. 11Mechanical Packaging and Orderable Information

7.5 Radio Control and User Interface

The CC1121 digital control system is built around the main radio control (MARC), which is implemented using an internal high-performance, 16-bit ultra-low-power processor. MARC handles power modes, radio sequencing and protocol timing.

A 4-wire SPI serial interface is used for configuration and data buffer access. The digital baseband includes support for channel configuration, packet handling, and data buffering. The host MCU can stay in power-down mode until a valid RF packet is received. This greatly reduces power consumption. When the host MCU receives a valid RF packet, it burst-reads the data. This reduces the required computing power.

The CC1121 radio control and user interface are based on the widely used the CC1101 transceiver. This relationship enables an easy transition between the two platforms. The command strobes and the main radio states are the same for the two platforms.

For legacy formats, the CC1121 device also supports two serial modes:

  • Synchronous serial mode: The CC1121 device performs bit synchronization and provides the MCU with a bit clock with associated data.
  • Transparent mode: The CC1121 outputs the digital baseband signal using a digital interpolation filter to eliminate jitter introduced by digital filtering and demodulation.