SWRS337A December   2025  – March 2026 CC3551E

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Functional Block Diagram
  6. 5 Pin Configuration and Functions
    1. 5.1 Pin Diagram
    2. 5.2 Pin Attributes
    3. 5.3 Signal Descriptions
  7. 6 Specifications
    1. 6.1  Absolute Maximum Ratings
    2. 6.2  ESD Ratings
    3. 6.3  Recommended Operating Conditions
    4. 6.4  Electrical Characteristics
    5. 6.5  Thermal Resistance Characteristics
    6. 6.6  WLAN Performance: 2.4-GHz Receiver Characteristics
    7. 6.7  WLAN Performance: 2.4-GHz Transmitter Power
    8. 6.8  WLAN Performance: 5-GHz Receiver Characteristics
    9. 6.9  WLAN Performance: 5-GHz Transmitter Power
    10. 6.10 Bluetooth LE Performance: Receiver Characteristics
    11. 6.11 Bluetooth LE Performance - Transmitter Characteristics
    12. 6.12 Current Consumption - 2.4GHz WLAN Static Modes 
    13. 6.13 Current Consumption - 5GHz WLAN Static Modes
    14. 6.14 Current Consumption - 2.4GHz WLAN Use Cases
    15. 6.15 Current Consumption - Bluetooth LE Static Modes 
    16. 6.16 Current Consumption - MCU Modes
    17. 6.17 Timing and Switching Characteristics
      1. 6.17.1 Clock Specifications
        1. 6.17.1.1 Fast Clock Using an External Crystal (XTAL)
          1. 6.17.1.1.1 External Fast Clock XTAL Specifications
        2. 6.17.1.2 Slow Clock Using Internal Oscillator
        3. 6.17.1.3 Slow Clock Using an External Oscialltor
          1. 6.17.1.3.1 External Slow Clock Oscillator Specifications
        4. 6.17.1.4 Slow Clock Using an External Crystal (XTAL)
          1. 6.17.1.4.1 External Slow Clock XTAL Specifications
      2. 6.17.2 Peripheral Characteristics
        1. 6.17.2.1  ADC
          1. 6.17.2.1.1 ADC Electrical Specifications
        2. 6.17.2.2  I2C
          1. 6.17.2.2.1 I2C Timing Parameters
          2. 6.17.2.2.2 I2C Timing Diagram
        3. 6.17.2.3  SPI
          1. 6.17.2.3.1 SPI Timing Parameters - Controller Mode
          2. 6.17.2.3.2 SPI Timing Diagrams - Controller Mode
          3. 6.17.2.3.3 SPI Timing Parameters - Peripheral Mode
          4. 6.17.2.3.4 SPI Timing Diagrams - Peripheral Mode
        4. 6.17.2.4  xSPI
          1. 6.17.2.4.1 QSPI Timing Parameters
        5. 6.17.2.5  UART
          1. 6.17.2.5.1 UART Timing Parameters
        6. 6.17.2.6  I2S
          1. 6.17.2.6.1 I2S Timing Parameters - Controller Mode
          2. 6.17.2.6.2 I2S Timing Parameters - Peripheral Mode
        7. 6.17.2.7  PDM
          1. 6.17.2.7.1 PDM Timing Parameters
        8. 6.17.2.8  CAN
          1. 6.17.2.8.1 CAN Characteristics
        9. 6.17.2.9  SDMMC
          1. 6.17.2.9.1 SDMMC Timing Parameters - Default Speed 
          2. 6.17.2.9.2 SDMMC Timing Parameters - High Speed 
        10. 6.17.2.10 SDIO
          1. 6.17.2.10.1 SDIO Timing Parameters - Default Speed 
          2. 6.17.2.10.2 SDIO Default Timing
          3. 6.17.2.10.3 SDIO Timing Parameters - High Speed 
          4. 6.17.2.10.4 SDIO High Speed Timing
  8. 7 Detailed Description
    1. 7.1  Overview
    2. 7.2  Arm Cortex-M33 Processor
    3. 7.3  Wireless Subsystem
      1. 7.3.1 WLAN
      2. 7.3.2 Bluetooth Low Energy
    4. 7.4  Memory Subsystem (MEMSS)
      1. 7.4.1 External Memory Interface
    5. 7.5  Hardware Security Module
    6. 7.6  Debug Subsystem (DEBUGSS)
    7. 7.7  General Purpose Timers
    8. 7.8  Real Time Clock (RTC)
    9. 7.9  Direct Memory Access (DMA)
    10. 7.10 Serial Peripherals and I/Os
  9. 8 Applications, Implementation, and Layout
  10. 9 Device and Documentation Support
    1. 9.1 Third-Party Products Disclaimer
    2. 9.2 Device Nomenclature
    3. 9.3 Tools and Software
    4. 9.4 Documentation Support
    5. 9.5 Support Resources
    6. 9.6 Trademarks
    7. 9.7 Electrostatic Discharge Caution
    8. 9.8 Glossary
  11. 10Revision History
  12. 11Mechanical, Packaging, and Orderable Information

1 Features

Microcontroller

  • Powerful 160MHz Arm®Cortex®-M33 processor with FPU, TrustZone®, and AI acceleration
  • High-speed quad-SPI and octal-SPI for XiP flash with on-the-fly decryption
  • Flexible configuration of low-latency TCM (up to 32KB) and Cache (32KB or 64KB) for improved code execution performance
  • 1.1MB embedded SRAM including 128KB TCM for Wi-Fi™, Bluetooth® Low Energy, networking, and application data

Peripherals

  • Up to 36 I/Os with flexible multiplexing options
  • 8 × general-purpose timers and pulse-width modulation (PWM)
  • 3 × universal asynchronous receiver-transmitter (UART)
  • 2 × Serial Peripheral Interface (SPI)
  • 2 × inter-integrated circuit (I2C)
  • Inter-IC sound (I2S)
  • Pulse density modulation (PDM)
  • Secure digital and multimedia card (SD/MMC)
  • Secure digital input output (SDIO) 2.0
  • Controller area network (CAN) 2.0
  • 8-channel, 12-bit analog-to-digital converter (ADC)

System Services

  • Direct memory access (DMA)
  • One-time-programmable memory (OTP)
  • Real-time clock (RTC) and watchdog timer (WDT)

Radio

  • Wi-Fi 6 (802.11ax)

    • 2.4GHz and 5GHz, single-stream 20MHz channels with application throughput up to 20Mbps (UDP)
    • Compatible with IEEE 802.11 a/b/g/n/ax
      • Orthogonal frequency-division multiple access (OFDMA)
      • Target wake time (TWT)
      • Trigger frames
      • Basic service set (BSS) color
    • Integrated PA for a complete WLAN system with up to 20.5dBm output power at 1 DSSS
    • Role support: STA, softAP , Wi-Fi direct, multi-role AP + STA
    • Support for personal and enterprise Wi-Fi security: WPA and WPA2 PSK, WPA2 Enterprise, WPA3 personal or enterprise
    • Wi-Fi TX Power:
      • 20.5dBm at 1DSSS
      • 17.8dBm at 54OFDM
    • Wi-Fi RX Sensitivity:
      • –98.7dBm at 1DSSS
      • –76.6dBm at 54OFDM
  • Bluetooth® low energy
    • Bluetooth low energy 5.4 certified stack
    • Supports long-range and high-speed PHYs (up to 2Mbps)

Security Features

  • ARM TrustZone
  • Hardware security module supporting all of the following:
    • ECC, RSA, AES, SHA2/3, MD5, CRC 16/32, and TRNG
    • Secure key storage
  • Initial secure programming
  • Secure boot
  • Software IP and cloning protection
  • Debug security through JTAG and debug port lock
  • OTP with ability to program root-of-trust public key
  • Secure over-the-air (OTA) updates
  • Anti-rollback protection

Clock Source

  • Fast clock: 52MHz XTAL
  • Slow clock: Internal low-frequency oscillator, 32.768kHz XTAL, or external slow clock source

Power Management

  • Support for 3.3V and 1.8V on multiple I/O domains
  • Supplies: VPA: 3.3V, VMAIN: 1.8V, VIO: 1.8/3.3V

Key Benefits

  • Complete software development kit with open-source TCP/IP and TLS stacks
  • Operating temperature: –40°C to +105°C
  • Support for 3-wire PTA coexistence interface for use with external 2.4GHz radios (for example Thread or Zigbee®)
  • Antenna selection capability

Package

  • Easy to design with 56-pin, 7mm × 7mm quad flat no leaded (QFN) package