ST STM32W108 2.4GHz IEEE 802.15.4无线方案

ST 公司的STM32W108是高性能的IEEE 802.15.4无线片上系统(SoC),集成了2.4GHz IEEE 802.15.4兼容的收发器,32位ARM Cortex-M3微处理器,128KB闪存和8KB RAM存储器以及基于ZigBee系统的外设.微处理器工作频率为6, 12 或24 MHz.收发器有极好的RF性能,正常模式链接高达102dB,可配置到107dB,RX灵敏度为-99dBm,可配置到-100dB,正常模式输出功率+3dBm,可配置到+7dBm,主要用在智能电表,建筑物和家庭自动化和控制,安全监视,ZigBee Pro无线传感器网络,RF4CE产品和遥控以及6LoWPAN和用户协议.本文介绍了STM32W108主要特性和方框图, 系统模块方框图以及时钟方框图, GPIO方框图, 串行控制方框图, 通用计时器方框图, ADC方框图和外设中断方框图.

STM32W108: High-performance, IEEE 802.15.4 wireless system-on-chip 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 ZigBee-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: System mode and Application mode. The networking stack software runs in System mode with full access to all areas of the chip. Application code runs in Application mode with limited access to the STM32W108 resources; this allows for the scheduling of events by the application developer while preventing modification of restricted areas of memory and registers. This architecture results in increased stability and reliability of deployed solutions.

The STM32W108 has 128 Kbytes of embedded Flash memory and 8 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, TWI, 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-Kbyte Flash, 8-Kbyte RAM memory

– AES128 encryption accelerator

– Flexible ADC, SPI/UART/TWI 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 +7 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

■ 6LoWPAN and custom protocols


图1.STM32W108方框图

图2.STM32W108系统模块方框图

图3.STM32W108时钟方框图

图4.STM32W108 GPIO方框图

图5.STM32W108串行控制方框图

图6.STM32W108通用计时器方框图

图7.STM32W108 ADC方框图

图8.STM32W108外设中断方框图