Features

■ 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

Applications

■ 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

Description

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.