Chip vs Chip

STM32WB55 vs CYW20820

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Side-by-side comparison of STM32WB55 and CYW20820 BLE SoCs.

    
    

      
    

  


  
  
  

    
      

        A
        
STM32WB55

      

      

    
    
      

        B
        
CYW20820

      

      

    
  

  

  
  

  






  
  

    
STM32WB55 vs CYW20820: Multiprotocol IoT SoC vs Dual-Mode Automotive Bluetooth SoC


Overview


The STM32WB55 from STMicroelectronics and the CYW20820 from Infineon (formerly Cypress) are both capable BLE SoCs with substantial feature sets, but they address different primary use cases. The STM32WB55 is a dual-core multiprotocol IoT SoC targeting smart home, industrial, and connected consumer electronics. The CYW20820 is a dual-mode (Classic + BLE) Bluetooth SoC designed for automotive infotainment, industrial wireless infrastructure, and enterprise Bluetooth mesh, with AEC-Q100 automotive qualification.


The STM32WB55's dual-core M4F + M0+ architecture gives it deterministic BLE radio timing regardless of application processor load — a significant advantage in complex real-time embedded systems. Its 1 MB Flash, 256 KB RAM, USB FS, and the rich STM32 peripheral ecosystem make it well-suited for IoT hub roles requiring multiple concurrent peripherals alongside BLE and Zigbee operation.


The CYW20820 integrates both Bluetooth Classic BR/EDR and BLE 5.2, enabling backward compatibility with the vast installed base of Bluetooth Classic audio devices (headphones, car hands-free) alongside modern BLE peripherals and Bluetooth mesh networks. Its automotive grade certification (AEC-Q100 Grade 1) allows -40°C to 105°C operation, making it suitable for vehicle electronics where consumer-grade chips cannot be used.




Key Differences


    

  • Radio mode: CYW20820 supports dual-mode Bluetooth Classic + BLE 5.2; STM32WB55 supports BLE 5.0/5.2 + Zigbee + OpenThread (no Classic Bluetooth).
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  • Automotive qualification: CYW20820 is AEC-Q100 Grade 1 certified; STM32WB55 is a commercial-grade part (-40°C to 85°C industrial range only).
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  • Dual-core isolation: STM32WB55's dual-core architecture provides deterministic BLE timing; CYW20820 uses a single application core without explicit radio/application CPU separation.
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  • USB: STM32WB55 includes USB 2.0 FS; CYW20820 does not have USB in its standard configuration.
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  • Zigbee/Thread: STM32WB55 supports Zigbee 3.0 and OpenThread; CYW20820 does not — it is purely Bluetooth (Classic + BLE).
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  • Bluetooth Mesh: CYW20820 has a mature Bluetooth mesh stack via WICED SDK; STM32WB55 supports Bluetooth mesh via CubeWB stack.
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  • Ecosystem: STM32WB55 uses STM32Cube/CubeWB; CYW20820 uses Infineon WICED.
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  • Temperature range: CYW20820 operates to 105°C; STM32WB55 operates to 85°C (extended industrial).
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Use Cases


STM32WB55 is ideal for:
- Smart home automation devices requiring BLE + Zigbee or BLE + Thread coexistence
- USB HID accessories and BLE-to-USB bridge applications
- Embedded systems with complex FreeRTOS application firmware requiring dual-core isolation
- STM32 ecosystem products benefiting from Cube HAL middleware compatibility


CYW20820 is ideal for:
- Automotive head units requiring both Bluetooth Classic (audio, HFP) and BLE (sensor data, OTA)
- Enterprise Bluetooth mesh installations in manufacturing, healthcare facilities, or large office buildings
- Industrial wireless sensors and actuators operating in extended temperature environments
- Applications requiring backward compatibility with Bluetooth Classic peripherals




Verdict


Choose the STM32WB55 for smart home IoT, multiprotocol BLE + Zigbee applications, and products benefiting from the STM32 ecosystem and USB support. Choose the CYW20820 when automotive AEC-Q100 qualification, Bluetooth Classic backward compatibility, or extended temperature operation are required — capabilities the STM32WB55 cannot provide.

  

  

  
  

  
  

    




  
Frequently Asked Questions


  

    
    

      
      

        
Our comparisons use verified datasheet specifications to create side-by-side tables. Each comparison includes a verdict explaining when to choose each option based on your project requirements.