nRF54LM20A | nRF54LM20B Datasheet

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nRF54LM20A and nRF54LM20B are part of the nRF54L Series of wireless System on Chips (SoCs). Every device in the series integrates an ultra-low power, multiprotocol 2.4 GHz radio with MCU (Microcontroller Unit) functionality featuring a 128 MHz Arm®Cortex®-M33 processor. The nRF54LM20B variant includes an Axon Neural Processing Unit (NPU) - an edge AI accelerator. nRF54LM20A and nRF54LM20B feature an extended peripheral set including high-speed USB, increased memory size with 2036 KB NVM and 512 KB RAM, and up to 66 GPIO pins.

Nordic Semiconductor’s proprietary technology, such as low-leakage RAM and a cutting-edge multiprotocol radio design, enables ultra-low power consumption, reducing battery size or extending battery life.

Designed with versatility in mind, the nRF54L Series SoCs enable a broad range of applications. The multiprotocol 2.4 GHz radio supports Bluetooth® LE with optional features including Channel Sounding introduced in Bluetooth Core 6.0, as well as 802.15.4-2020 for standards such as Thread®, Matter, and Zigbee®, and a proprietary 2.4 GHz mode supporting up to 4 Mbps for higher throughput. The devices integrate the peripherals expected in a wireless microcontroller, enabling many products to be implemented with a single chip. An integrated RISC-V coprocessor further reduces the need for external ICs.

nRF54LM20A and nRF54LM20B enable demanding Bluetooth LE devices, as well as smart home and industrial applications, which require more memory, advanced features, and high GPIO counts.

The nRF54LM20B Axon NPU provides acceleration in edge AI applications such as health, biometric and activity tracking, voice control and audio classification, and low-fidelity vision.

Key features

128 MHz Arm Cortex-M33 processor
2036 KB NVM and 512 KB RAM
Multiprotocol 2.4 GHz radio supporting Bluetooth LE, 802.15.4-2020, and 2.4 GHz proprietary modes (up to 4 Mbps)
Seven serial interfaces (SPI, TWI, UART)
High-speed USB interface
Extended set of interfaces, peripherals, and timers including Global RTC available in System OFF, ADC, TDM, PDM, NFC, PWM, and QDEC
128 MHz RISC-V coprocessor
Advanced security including TrustZone® isolation, tamper detection, and cryptographic engine with side-channel leakage protection
Ultra-compact CSP and QFN packages


Radio Bluetooth LE LE 2M, LE 1M, LE Coded Channel Sounding IEEE 802.15.4-2020 – 250 kbps Enables Matter, Thread, Zigbee 2.4 GHz proprietary GFSK 4 Mbps, 2 Mbps, 1 Mbps Single-ended antenna output (on-chip balun) 128-bit AES/ECB/CCM/AAR coprocessor Configurable TX power with 1 dBm step size from -10 dBm to maximum Processor 128MHz Arm Cortex-M33 CPU FPU, DSP, MPU, TrustZone Debug – SWD, ETM, ITM, DWT, CTI, TPIU Memory 2036 KB NVM (RRAM) 512 KB RAM Edge AI accelerator nRF54LM20B only: Axon NPU (AXONS) Coprocessor/SoftPeripherals 128 MHz RISC-V coprocessor (VPR) sQSPI available as SoftPeripheral for VPR; see the software documentation for details	Peripherals Seven fully featured serial interfaces with EasyDMA, supporting I²C, SPI controller/peripheral, and UART One HS-SPI up to 32 MHz, six SPI up to 8 MHz (SPIM, SPIS) Six TWI up to 400 kHz and I²C compatible (TWIM, TWIS) One HS-UART up to 4 Mbps, six UART up to 1 Mbps (UARTE) SAADC with eight programmable gain channels 14-bit at 62.5 ksps (oversampled) 12-bit at 125 ksps (oversampled) 10-bit at up to 2 Msps High-speed USB interface (USBHS) Global RTC can run in System OFF mode and implement a shared system timer (GRTC) NFC-A listening device (NFCT) Pulse density modulation interface (PDM) Time division multiplexed sound interface, also configurable as I²S interface (TDM) Three pulse width modulation four-channel units with autonomous waveform generation (PWM) Two quadrature decoders (QDEC) Two individual watchdog timers for secure and non-secure context (WDT) Seven 32-bit timers with counter mode (TIMER) Temperature sensor (TEMP) Comparator and low-power comparator with wake-up from System OFF mode (COMP, LPCOMP)	GPIO Up to 66 GPIO pins 64 MHz and 8 MHz ports Power supply and clock Single-inductor DC/DC regulator Single 32 MHz crystal operation Optional 32.768 kHz crystal Security Arm TrustZone, Root of Trust, secure boot, secure storage Security components – Cryptographic engine (CRACEN), Key management (KMU) Physical protection – Tamper detectors (TAMPC, GLITCHDET), Side-channel protection Key specifications 8 dBm/7 dBm maximum TX power (CSP/QFN) -95.5 dBm RX sensitivity for 1 Mbps Bluetooth LE -101 dBm RX sensitivity for IEEE 802.15.4 503 CoreMark®, 3.93 CoreMark/MHz EEMBC CoreMark executing from non-volatile memory 1.7 V to 3.6 V supply and GPIO voltage -40°C to +85°C operating temperature Packages for all variants CSP61 (CAAA) with 40 GPIO pins 3.02x2.43 mm with 0.325 mm pitch CSP98 (PAAA) with 66 GPIO pins 3.67x3.85 mm with 0.35 mm pitch QFN52 (QGAA) with 32 GPIO pins 6x6 mm with 0.4 mm pitch