STM32W108HBU62 datasheet(9/179 Pages) STMICROELECTRONICS

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STM32W108CB, STM32W108HB

Description

Doc ID 16252 Rev 2

9/179

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 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.

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