Seeed Studio XIAO nRF54LM20A and XIAO nRF54LM20A Sense are tiny USB-C IoT boards based on Nordic Semiconductor’s nRF54LM20A wireless SoC offering Bluetooth 6.0, Matter, Thread, Zigbee, NFC, Amazon Sidewalk, and 2.4 GHz proprietary connectivity.
Both variants come with on-chip 2 MB flash and 512 KB RAM, as well as an 8 MB flash, an nPM1300 PMIC for power management, up to 28 GPIOs, and an RGB LED. The Sense model adds a digital microphone and 6-axis IMU with motion-triggered wake-up for ultra-low power applications.
XIAO nRF54LM20A (Sense) specifications:
- Wireless SoC – Nordic Semiconductor nRF54LM20A
- CPU
- Arm Cortex-M33 application processor clocked at up to 128 MHz
- RISC-V coprocessor running at 128 MHz
- Memory – 512 kB of RAM
- Storage – 2 MB of Non-Volatile Memory (NVM)
- Wireless
- Bluetooth LE 6.0 with PHY rates of 125 kbit/s, 500 kbit/s, 1 Mbit/s, and 2 Mbit/s
- Bluetooth Channel Sounding, Bluetooth LE long range (coded PHY), Bluetooth Mesh
- IEEE 802.15.4 supporting Thread, Zigbee, and Matter
- Nordic Proprietary 2.4 GHz protocol and NFC
- Amazon Sidewalk
- +10 dBm maximum radiated output power (EIRP)
- CPU
- Storage – 8MB flash
- USB – USB Type-C port for power and programming
- Sensors (Sense model only)
- 6-Axis IMU sensor (takes one I2C interface)
- PDM microphone (takes two GPIOs)
- Expansion I/Os
- 2x 13-pin headers (alternating through holes and castellated holes) with up to 20x GPIO (PWM), 5x ADC, up to 2x I2C, UART, SPI, 5V, 3.3V, and GND
- 8x pads with up to 8x GPIO
- 2x NFC pads
- Debugging – Pads for nRF54LM20A SWD and SAMD11 SWD
- Misc
- Reset and Boot button
- Charge LED, user RGB LED
- External IPEX antenna connector
- 2x pads for SHPHOLD (ship/hibernate mode to keep the device in an ultra-low-power state during transportation until a button is pressed or external power is applied)
- Power Supply
- 5V via USB Type-C port
- 2x pads for 3.7V LiPo batteries managed via nPM1300 PMIC
- Power consumption (Sense, 3.7V)
- Light sleep: ~9.96µA
- Deep sleep (System OFF): ~4.76µA
- Deep sleep (System OFF, GRTC wake-up): ~4.92µA
- Ship mode: 0.33µA
- Dimensions – 21 x 17.5mm
- Temperature Range –-20°C to 70°C
Compared to the earlier XIAO nRF54L15 boards, the XIAO nRF54LM20A boards expose more I/Os thanks to alternative through and castellated holes that enable higher pin density while keeping the same XIAO form factor. They also add support for NFC, while keeping BLE 6.0 and Matter/Thread connectivity for low-power IoT, wearables, Matter/Thread devices, and edge applications.
Seeed Studio provides support for Nordic nRF Connect SDK and PlatformIO, both based on Zephyr RTOS, and has also prepared a tutorial to use MicroPython. They explicitly note that the Arduino IDE is not supported. You’ll find instructions to get started and use features like the microphone, IMU, and low-power modes on the wiki.
The XIAO nRF54LM20A and XIAO nRF54LM20A Sense can be pre-ordered for ~$10 and $16 on AliExpress or the Seeed Studio store, with shipping starting from 15, July, 2026. The boards may eventually become available on the company’s Amazon store. XIAO nRF54LM20B variants, adding an Axon NPU for tinyML applications, are also planned and expected to launch at the end of Q3 2026.
Jean-Luc started CNX Software in 2010 as a part-time endeavor, before quitting his job as a software engineering manager, and starting to write daily news, and reviews full time later in 2011.
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