STMicroelectronics STM32WB35 Series MCU
Multiprotocol wireless 32-bit MCU Arm®-based Cortex®-M4 with FPU, Bluetooth® 5 and 802.15.4 radio solution
The STMicroelectronics STM32WB35 series is an ultra-low-power microcontroller based on the high-performance dual core Arm Cortex-M4 32-bit RISC.
Featuring 256KB (STM32WB35CC) or 512KB (STM32WB35CE) Flash, 96kB SRAM, Zigbee 3.0, Thread and more state-of-the-art STMicroelectronics functionalities, the STM32WB35 MCU group embeds a powerful and ultra-low-power radio compliant with the Bluetooth® Low Energy SIG specification v5.0 and with IEEE 802.15.4-2011. These microcontrollers also contain a dedicated Arm® Cortex® -M0+ 32MHz for performing all the real-time low layer operation.
Along with the STM32WB55 series, the newly-introduced STM32WB35 MCUs are designed to be extremely low-power thanks to the Arm Cortex-M4, operating at a frequency of up to 64 MHz.
Arm® Cortex-M4 32-bit RISC Core
The Cortex®-M4 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.
Both microcontrollers embed high-speed memory:
STM32WB55xx: Up to 1 Mbyte of Flash memory; up to 256 Kbytes of SRAM
STM32WB35xx: Up to 512 Kbytes of Flash memory; up to 96 Kbytes of SRAM
The STM32WB MCUs feature 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 STMicroelectronics STM32WB35/55 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.
STM32WB35/55 Encryption Engines
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 STM32WB MCUs offer a fast 12-bit ADC and two ultra-low-power comparators associated with a high accuracy reference voltage generator.
These STMicroelectronics MCUs 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 STM32WB55 MCUs also embed an integrated LCD driver up to 8x40 or 4x44, with internal step-up converter.
The STM32WB55 and STM32WB35 microcontrollers 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 microcontrollers 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 STM32WB35 MCUs 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.
Packages: The STM32WB55xx offers four packages, from 48 to 129 pins. The STM32WB35xx offers one package, 48 pins.
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STMicroelectronics STM32WB35CE – Circuit Diagram