原标题：ST STM32W108 32位无线MCU RF解决方案

　　ST公司的STM32W108 是集成2.4GHz IEEE 802.15.4兼容的收发器, 32位ARM Cortex-M3微处理器,闪存和RAM存储器以及基于IEEE 802.15.4系统外设的低功耗系统级芯片(SoC), 2.1-3.6 V单电源工作,主要用在智能电网,建筑物自动化和控制,家庭自动化和控制,ZigBee Pro无线传感器网络,安全和监视系统,RF4CE产品和遥控设备.本文介绍了STM32W108主要特性,框图以及RF控制评估板STM32W-RFCKIT主要特性,电路图和材料清单.

　　The STM32W108 is a fully integrated System-on-Chip that integrates a 2.4 GHz, IEEE 802.15.4-compliant transceiver, 32-bit ARM® Cortex™-M3 microprocessor, Flash and RAM memory, and peripherals of use to designers of 802.15.4-based systems.

　　The transceiver utilizes an efficient architecture that exceeds the dynamic range requirements imposed by the IEEE 802.15.4-2003 standard by over 15 dB. The integrated receive channel filtering allows for robust co-existence with other communication standards in the 2.4 GHz spectrum, such as IEEE 802.11 and Bluetooth. The integrated regulator, VCO, loop filter, and power amplifier keep the external component count low. An optional high performance radio mode (boost mode) is software-selectable to boost dynamic range.

　　The integrated 32-bit ARM® Cortex™-M3 microprocessor is highly optimized for high performance, low power consumption, and efficient memory utilization. Including an integrated MPU, it supports two different modes of operation: Privileged mode and Unprivileged mode. This architecture could be used to separate the networking stack from the application code and prevent unwanted modification of restricted areas of memory and registers resulting in increased stability and reliability of deployed solutions.

　　The STM32W108 has 128/192/256 Kbytes of embedded Flash memory and 8/12/16 Kbytes of integrated RAM for data and program storage. The STM32W108 HAL software employs an effective wear-leveling algorithm that optimizes the lifetime of the embedded Flash.

　　To maintain the strict timing requirements imposed by the ZigBee and IEEE 802.15.4-2003 standards, the STM32W108 integrates a number of MAC functions into the hardware. The MAC hardware handles automatic ACK transmission and reception, automatic backoff delay, and clear channel assessment for transmission, as well as automatic filtering of received packets. A packet trace interface is also integrated with the MAC, allowing complete, non-intrusive capture of all packets to and from the STM32W108.

　　The STM32W108 offers a number of advanced power management features that enable long battery life. A high-frequency internal RC oscillator allows the processor core to begin code execution quickly upon waking. Various deep sleep modes are available with less than 1 μA power consumption while retaining RAM contents. To support user-defined applications, on-chip peripherals include UART, SPI, I2C, ADC and general-purpose timers, as well as up to 24 GPIOs. Additionally, an integrated voltage regulator, power-on-reset circuit, and sleep timer are available.

　　STM32W108主要特性:

　　• Complete system-on-chip

　　– 32-bit ARM® Cortex™-M3 processor

　　– 2.4 GHz IEEE 802.15.4 transceiver & lower MAC

　　– 128/192/256-Kbyte Flash, 8/12/16-Kbyte RAM memory

　　– AES128 encryption accelerator

　　– Flexible ADC, SPI/UART/I2C serial communications, and general-purpose timers

　　– 24 highly configurable GPIOs with Schmitt trigger inputs

　　• Industry-leading ARM® Cortex™-M3 processor

　　– Leading 32-bit processing performance

　　– Highly efficient Thumb®-2 instruction set

　　– Operation at 6, 12 or 24 MHz

　　– Flexible nested vectored interrupt controller

　　• Low power consumption, advanced management

　　– Receive current (w/ CPU): 27 mA

　　– Transmit current (w/ CPU, +3 dBm TX): 31 mA

　　– Low deep sleep current, with retained RAM and GPIO: 400 nA/800 nA with/without sleep timer

　　– Low-frequency internal RC oscillator for low-power sleep timing

　　– High-frequency internal RC oscillator for fast (100 μs) processor start-up from sleep

　　• Exceptional RF performance

　　– Normal mode link budget up to 102 dB; configurable up to 107 dB

　　– -99 dBm normal RX sensitivity; configurable to -100 dBm (1% PER, 20 byte packet)

　　– +3 dB normal mode output power; configurable up to +8 dBm

　　– Robust WiFi and Bluetooth coexistence

　　• Innovative network and processor debug

　　– Non-intrusive hardware packet trace

　　– Serial wire/JTAG interface

　　– Standard ARM debug capabilities: Flash patch & breakpoint; data watchpoint & trace; instrumentation trace macrocell

　　• Application flexibility

　　– Single voltage operation: 2.1-3.6 V with internal 1.8 V and 1.25 V regulators

　　– Optional 32.768 kHz crystal for higher timer accuracy

　　– Low external component count with single 24 MHz crystal

　　– Support for external power amplifier

　　– Small 7x7 mm 48-pin VFQFPN package or 6x6 mm 40-pin VFQFPN package

　　STM32W108应用:

　　• Smart energy

　　• Building automation and control

　　• Home automation and control

　　• Security and monitoring

　　• ZigBee® Pro wireless sensor networking

　　• RF4CE products and remote controls

　　图1. STM32W108框图

　　RF控制评估板STM32W-RFCKIT

　　The STM32W-RFCKIT low-cost RF control kit is an easy-to-use tool for STM32W108xx RF microcontrollers. This family of microcontrollers integrates a 32-bit ARM® Cortex™-M3 microprocessor and a 2.4 GHz, IEEE 802.15.4-compliant transceiver. The kit demonstrates plug and play 2.4 GHz RF point-to-point communications targeting general-purpose wireless control systems.

　　The STM32W-RFCKIT RF control kit provides demonstration applications and documentation which serve as a reference for creating your own applications and reprogramming the STM32W108xx microcontroller.

　　You can run the STM32W-RFCKIT RF control kit in several ways using the dedicated software libraries (Simplified MAC and ZigBee RF4CE). This kit provides access to a set of straightforward APIs enabling application engineers to easily develop RF control capabilities such as LEDs, serial communication channels (virtual COM through USB), MEM enabled pointers, etc. Moreover, thanks to the flexibility of STM32W microcontrollers, developers will also be able to use the kit with other available protocol network libraries: MAC based, RF4CE.

　　This manual provides information about:

　　■ STM32W-RFCKIT RF control kit components

　　■ How to install the related hardware and software trees

　　The STM32W-RFCKIT RF control kit’s package contains the following hardware components:

　　● One STM32W108xx MB950 RF-mote board

　　● One STM32W108xx MB951 USB dongle

　　图2. RF控制评估板STM32W-RFCKIT外形图:左:MB950 RF-mote板;右: MB951 USB加密狗

　　MB950 rev. A材料清单:

　　MB951 rev. A材料清单:

　　MB953 rev. A材料清单: