STM32WB55CE - Ultra-low-power BLE SoC

Ultra-low-power dual core Arm Cortex-M4 MCU 64 MHz, Cortex-M0+ 32 MHz with 512 Kbytes of Flash memory, Bluetooth LE 5.2, 802.15.4, USB, LCD, AES-256
STM32WB55CE - Ultra-low-power BLE SoC

The STM32WB55xx and STM32WB35xx multiprotocol wireless and ultra-low-power devices embed a powerful and ultra-low-power radio compliant with the Bluetooth® Low Energy SIG specification 5.2 and with IEEE 802.15.4-2011. They contain a dedicated Arm® Cortex®-M0+ for performing all the real-time low layer operation.

The devices are designed to be extremely low-power and are based on the high-performance Arm® Cortex®-M4 32-bit RISC core operating at a frequency of up to 64 MHz. This core features a Floating point unit (FPU) single precision that supports all Arm®single-precision data-processing instructions and data types. It also implements a full set of DSP instructions and a memory protection unit (MPU) that enhances application security.


  • 2.4 GHz
  • RF transceiver supporting Bluetooth® 5.2 specification, IEEE 802.15.4-2011 PHY and MAC, supporting Thread and Zigbee® 3.0
  • RX sensitivity: -96 dBm (Bluetooth® Low Energy at 1 Mbps), -100 dBm (802.15.4)
  • Programmable output power up to +6 dBm with 1 dB steps
  • Integrated balun to reduce BOM
  • Support for 2 Mbps
  • Support advertising extension
  • Dedicated Arm® 32-bit Cortex® M0+ CPU for real-time Radio layer
  • Accurate RSSI to enable power control
  • Suitable for systems requiring compliance with radio frequency regulations ETSI EN 300 328, EN 300 440, FCC CFR47 Part 15 and ARIB STD-T66
  • Support for external PA
  • Available integrated passive device (IPD) companion chip for optimized matching solution (MLPF-WB-01E3 or MLPF-WB-02E3)

Ultra-low-power platform
  • 1.71 to 3.6 V power supply
  • – 40 °C to 85 / 105 °C temperature ranges
  • 13 nA shutdown mode
  • 600 nA Standby mode + RTC + 32 KB RAM
  • 2.1 µA Stop mode + RTC + 256 KB RAM
  • Active-mode MCU: < 53 µA / MHz when RF and SMPS on
  • Radio: Rx 4.5 mA / Tx at 0 dBm 5.2 mA

  • Arm® 32-bit Cortex®-M4 CPU with FPU, adaptive real-time accelerator (ART Accelerator) allowing 0-wait-state execution from Flash memory, frequency up to 64 MHz, MPU, 80 DMIPS and DSP instructions

Performance benchmark
  • 1.25 DMIPS/MHz (Drystone 2.1)
  • 219.48 CoreMark® (3.43 CoreMark/MHz at 64 MHz)

Energy benckmark
  • 303 ULPMark™ CP score

Supply and reset management
  • High efficiency embedded SMPS step-down converter with intelligent bypass mode
  • Ultra-safe, low-power BOR (brownout reset) with five selectable thresholds
  • Ultra-low-power POR/PDR
  • Programmable voltage detector (PVD)
  • VBAT mode with RTC and backup registers

Clock sources
  • 32 MHz crystal oscillator with integrated trimming capacitors (Radio and CPU clock)
  • 32 kHz crystal oscillator for RTC (LSE)
  • Internal low-power 32 kHz (±5%) RC (LSI1)
  • Internal low-power 32 kHz (stability ±500 ppm) RC (LSI2)
  • Internal multispeed 100 kHz to 48 MHz oscillator, auto-trimmed by LSE (better than ±0.25% accuracy)
  • High speed internal 16 MHz factory trimmed RC (±1%)
  • 2x PLL for system clock, USB, SAI and ADC

  • Up to 1 MB Flash memory with sector protection (PCROP) against R/W operations, enabling radio stack and application
  • Up to 256 KB SRAM, including 64 KB with hardware parity check
  • 20x32-bit backup register
  • Boot loader supporting USART, SPI, I2C and USB interfaces
  • OTA (over the air) Bluetooth® Low Energy and 802.15.4 update
  • Quad SPI memory interface with XIP
  • 1 Kbyte (128 double words) OTP

Rich analog peripherals (down to 1.62 V)
  • 12-bit ADC 4.26 Msps, up to 16-bit with hardware oversampling, 200 µA/Msps
  • 2x ultra-low-power comparator
  • Accurate 2.5 V or 2.048 V reference voltage buffered output

System peripherals
  • Inter processor communication controller (IPCC) for communication with Bluetooth® Low Energy and 802.15.4
  • HW semaphores for resources sharing between CPUs
  • 2x DMA controllers (7x channels each) supporting ADC, SPI, I2C, USART, QSPI, SAI, AES, timers
  • 1x USART (ISO 7816, IrDA, SPI Master, Modbus and Smartcard mode)
  • 1x LPUART (low power)
  • 2x SPI 32 Mbit/s
  • 2x I2C (SMBus/PMBus®)
  • 1x SAI (dual channel high quality audio)
  • 1x USB 2.0 FS device, crystal-less, BCD and LPM
  • Touch sensing controller, up to 18 sensors
  • LCD 8x40 with step-up converter
  • 1x 16-bit, four channels advanced timer
  • 2x 16-bit, two channels timer
  • 1x 32-bit, four channels timer
  • 2x 16-bit ultra-low-power timer
  • 1x independent Systick
  • 1x independent watchdog
  • 1x window watchdog

Security and ID
  • Secure firmware installation (SFI) for Bluetooth® Low Energy and 802.15.4 SW stack
  • 3x hardware encryption AES maximum 256-bit for the application, the Bluetooth® Low Energy and IEEE802.15.4
  • Customer key storage / key manager services
  • HW public key authority (PKA)
  • Cryptographic algorithms: RSA, Diffie-Helman, ECC over GF(p)
  • True random number generator (RNG)
  • Sector protection against R/W operation (PCROP)
  • CRC calculation unit
  • Die information: 96-bit unique ID
  • IEEE 64-bit unique ID. Possibility to derive 802.15.4 64-bit and Bluetooth® Low Energy 48-bit EUI

Up to 72 fast I/Os, 70 of them 5 V-tolerant

Development support
  • Serial wire debug (SWD), JTAG for the application processor
  • Application cross trigger with input / output
  • Embedded Trace Macrocell™ for application

All packages are ECOPACK2 compliant


*STMicroelectronics Authorized Distributor

Product Applications

  • 智慧手錶解決方案


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