– 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
Memories
– Up to 1 MB Flash memory with sector
protection (PCROP) against R/W
operations, enabling authentic Bluetooth®
Low Energy and 802.15.4 SW stack
– 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
Description
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 v5.0 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.
Enhanced inter-processor communication is provided by the IPCC with six bidirectional
channels. The HSEM provides hardware semaphores used to share common resources
between the two processors.
The devices embed high-speed memories (up to 1 Mbyte of Flash memory for
STM32WB55xx, up to 512 Kbytes for STM32WB35xx, up to 256 Kbytes of SRAM for
STM32WB55xx, 96 Kbytes for STM32WB35xx), a Quad-SPI Flash memory interface
(available on all packages) and an extensive range of enhanced I/Os and peripherals.
Direct data transfer between memory and peripherals and from memory to memory is
supported by fourteen DMA channels with a full flexible channel mapping by the DMAMUX
peripheral.
The devices feature several mechanisms for embedded Flash memory and SRAM: readout
protection, write protection and proprietary code readout protection. Portions of the memory
can be secured for Cortex® -M0+ exclusive access.
The two AES encryption engines, PKA and RNG enable lower layer MAC and upper layer
cryptography. A customer key storage feature may be used to keep the keys hidden.
The devices offer a fast 12-bit ADC and two ultra-low-power comparators associated with a
high accuracy reference voltage generator.
These devices embed a low-power RTC, one advanced 16-bit timer, one general-purpose
32-bit timer, two general-purpose 16-bit timers, and two 16-bit low-power timers.
In addition, up to 18 capacitive sensing channels are available for STM32WB55xx (not on
UFQFPN48 package). The STM32WB55xx also embed an integrated LCD driver up to 8x40
or 4x44, with internal step-up converter.
The STM32WB55xx and STM32WB35xx also feature standard and advanced
communication interfaces, namely one USART (ISO 7816, IrDA, Modbus and Smartcard
mode), one low- power UART (LPUART), two I2Cs (SMBus/PMBus), two SPIs (one for
STM32WB35xx) up to 32 MHz, one serial audio interface (SAI) with two channels and three
PDMs, one USB 2.0 FS device with embedded crystal-less oscillator, supporting BCD and
LPM and one Quad-SPI with execute-in-place (XIP) capability.
The STM32WB55xx and STM32WB35xx operate in the -40 to +105 °C (+125 °C junction)
and -40 to +85 °C (+105 °C junction) temperature ranges from a 1.71 to 3.6 V power supply.
A comprehensive set of power-saving modes enables the design of low-power applications.
The devices include independent power supplies for analog input for ADC.
The STM32WB55xx and STM32WB35xx integrate a high efficiency SMPS step-down
converter with automatic bypass mode capability when the VDD falls below VBORx (x=1, 2, 3,
4) voltage level (default is 2.0 V). It includes independent power supplies for analog input for
ADC and comparators, as well as a 3.3 V dedicated supply input for USB.
A VBAT dedicated supply allows the devices to back up the LSE 32.768 kHz oscillator, the
RTC and the backup registers, thus enabling the STM32WB55xx and STM32WB35xx to
supply these functions even if the main VDD is not present through a CR2032-like battery, a
Supercap or a small rechargeable battery.
The STM32WB55xx offer four packages, from 48 to 129 pins. The STM32WB35xx offer one
package, 48 pins.
