Synaptics SYN20708 IoT SoC Combines Bluetooth 5.4 and IEEE 802.15.4 for IoT Applications

Synaptics SYN20708 IoT SoC Combines Bluetooth 5.4 and IEEE 802.15.4 for IoT Applications

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The Synaptics SYN20708 is a low-power IoT SoC designed for simultaneous handling Bluetooth 5.4 Classic/Low Energy, IEEE 802.15.4, along with Zigbee, Thread, and Matter protocols. Built using a 16-nm FinFET process, it features a 160 MHz Arm Cortex-M4 processor, 544 KB system RAM, 1664 KB code RAM, and integrated power amplifiers (PAs) and low-noise amplifiers (LNAs).

Additionally, it also includes features like high-accuracy distance measurement (HADM), angle-of-arrival (AoA), and angle-of-departure (AoD) to enable precise positioning. It also comes with coexistence interfaces like SECI and Bluetooth’s Adaptive Frequency Hopping (AFH) to ensure efficient multiprotocol operation in dense IoT environments. Operating within an industrial temperature range (-40°C to +85°C), the compact 5.5×5.5 mm SoC is ideal for industrial, consumer, and IoT applications requiring reliable wireless communication.

Synaptics SYN20708 IoT SoC Specifications

  • CPU:
    • Arm Cortex-M4 processor @ 160 MHz
  • Memory/Storage:
    • 544 KB System RAM
    • 1664 KB Code RAM
    • 1640 KB ROM
    • 256 bytes OTP memory
  • Connectivity:
    • Dual-radio Bluetooth 5.4
      • Bluetooth Classic and Bluetooth Low Energy (BLE)
      • Support for Bluetooth 6.0 features like High-Accuracy Distance Measurement (HADM)
      • Angle of Arrival (AoA) and Angle of Departure (AoD) support
      • Bluetooth Class 1 and Class 2 TX operation
      • BLE Long Range (BLE-LR) and ISO Channels (ISOC) hardware support
    • IEEE 802.15.4
      • Zigbee, Thread, and Matter protocols
  • RF Features:
    • Dual 2.4 GHz radios for concurrent operation
    • Integrated 2.4 GHz Power Amplifiers (PAs) and Low-Noise Amplifiers (LNAs)
    • Support for external PAs
    • Integrated Transmit/Receive (TR) switch with support for external switch
    • 4 GPIO and antenna-selection pins for AoA/AoD/HADM
  • Interfaces:
    • Synaptics-proprietary Serial Enhanced Coexistence Interface (SECI) for Wi-Fi/Bluetooth coexistence
    • 3-wire IEEE 802.15.2 coexistence interface
    • Optional SPI for local flash connection
    • I²C master for external sensor control
    • High-speed UART up to 12 Mbps
    • Peripheral/debug UART
  • Miscellaneous:
    • Electronic Shelf Label (ESL) support
  • Power:
    • 3.3V, 1.8V, and 1.05V external power supplies
    • Integrated Power Management Unit (PMU) and LDO regulators
  • Package:
    • 103-pin FCBGA package with 0.4 mm pitch
  • Dimensions:
    • 5.5 x 5.5 mm
  • Operating Temperature:
    • -40°C to +85°C (industrial range)
  • Process Technology:
    • 16 nm FinFET

The Serial Enhanced Coexistence Interface (SECI) allows Bluetooth and Zigbee to coordinate in real-time, avoiding interference by sharing transmission priorities. For instance, Bluetooth can delay Zigbee activity to prioritize tasks like audio streaming. Precise timing and Adaptive Frequency Hopping (AFH) further ensure reliable communication by switching to less crowded channels, enabling efficient multiprotocol operation in dense IoT environments.

After going through the specification, it looks like the Synaptics SYN4383 and SYN43756(E) but it’s more like a cost-down version of the SYN4383 as it features Wi-Fi 6E, whereas the SYN20708 only has Bluetooth support. At the time of writing the company does not mention any prosing information about the product but more information can be found on the products page and press release page.

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About Debashis Das

Tech Content Creator | Hardware Design Engineer | IoT Enthusiast | Digital Storyteller | Video Creator | From crafting digital dialogues at Semicon Media to orchestrating online engagement at Electronics-lab.com, my journey is about making tech talk interesting and accessible. In the quiet corners of the day, I advocate for easier tech education, one tutorial at a time. Let's connect and keep the digital dialogue going!

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