EFR32SG23 Sub-GHz FSK Wireless SoC for Amazon Sidewalk

The EFR32SG23 is a secure, low power wireless SoC for Amazon Sidewalk devices that supports sub-GHz FSK, providing reliable range beyond the front door to cover detached buildings, pools, and spas. The multi-core device has efficient ARM Cortex®-M33 running up to 78 MHz and with 512 kB of Flash and 64 kB of RAM. The low active and sleep currents make it ideal for battery operated end devices like sensors including door, window, and temperature sensors devices, while the link budget of 129.5 dBm provides long range and reliable communication. The dedicated security core supports our Secure Vault™ High, bring industry leading IoT security to the device to protect wireless data and the device from both remote and local attacks.

512 kB of Flash and 64 kB of RAM
Sub-GHz FSK operation
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EFR32SG23 Common Specs

Low Power Wireless System-on-Chip

  • ARM Cortex®-M33 (78 MHz) with DSP and FPU
  • 512 kB flash program memory
  • 64 kB RAM data memory
  • Sub-GHz radio operationn

Low Energy Consumption

  • 4.0 mA RX current at 915 MHz (50 kbps 2GFSK)
  • 85.5 mA TX current @ 20 dBm output power at 915 MHz
  • 26 μA/MHz in Active Mode (EM0) at 39.0 MHz
  • 1.2 μA EM2 DeepSleep current (16 kB RAM retention and RTC running from LFRCO)

Wide Selection of MCU peripherals

  • 16-bit Analog to Digital Converter (ADC)
  • 2 × Analog Comparator (ACMP)
  • 2 x Digital to Analog Converter (VDAC)
  • Low-Energy Sensor Interface (LESENSE)
  • 23 General Purpose I/O pins
  • 8 Channel DMA Controller
  • 12 Channel Peripheral Reflex System (PRS)
  • 4 × 16-bit Timer/Counter with 3 Compare/Capture/PWM channels
  • 1 × 32-bit Timer/Counter with 3 Compare/Capture/PWM channels
  • 32-bit Real Time Counter
  • 24-bit Low Energy Timer for waveform generation
  • 16-bit Pulse Counter with asynchronous operation (PCNT)
  • 2 × Watchdog Timer
  • 3 × Enhanced Universal Synchronous/Asynchronous Receiver/Transmitter (UART/SPI)
  • 1 x Universal Synchronous/Asynchronous Receiver/Transmitter (UART/SPI/I2S)
  • 2 × I2C interface with SMBus support
  • Keypad scanner supporting up to 6 x 8 matrix (KEYSCAN)
  • Die temperature sensor

Protocol Support

  • Amazon Sidewalk

HIgh Performance RF

  • TX power up to +20 dBm
  • -109.5 dBm sensitivity @ 50 kbps, 915 MHz 2GFSK

Wide Operating Range

  • 1.71 to 3.8 V single power supply
  • -40 °C to +125 °C


  • QFN40 5 mm x 5 mm x 0.85 mm

Secure Vault


Find the Right EFR32SG23 Device Select Columns
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Part Number Pricing Integrated MCU MCU Core Flash RAM Communications Max Output Power (dBm) Proprietary 2.4 GHz Proprietary Sub-GHz Multiprotocol Security GPIO Cap Sense Temp Sensor Timers (16-bit) RTC Comparators Temperature Range ºC Package Type Package Size (mm) Debug Interface
1K @ US$2.44 ARM Cortex-M33 512 64 2 x I²C 4 x SPI 20 AES-128 AES-256 SHA-1 SHA-2 23 4 2 -40 125 QFN40 5x5 JTAG, SW, ETM

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