The SPWF01SA and the SPWF01SC intelligent Wi-Fi modules represent a plug-and-play and standalone 802.11 b/g/n solution for easy integration of wireless Internet connectivity features into existing or new products.

Configured around a single-chip 802.11 transceiver with integrated PA and comprehensive power management subsystem, and an STM32 microcontroller with an extensive GPIO suite, the modules also incorporate timing clocks and voltage regulators. Two different options exist based on the integrated Flash memory. The SPWF01Sx.1y orderable parts integrate 1.5 MB of Flash, while the SPWF01Sx.2y orderable parts integrate 512 KB of Flash.

The module is available either configured with an embedded micro 2.45 GHz highly-efficient ISM band antenna (SPWF01SA), or with an u.fl connector for external antenna connection (SPWF01SC).

With low power consumption and ultra-compact (2.7 x 1.5 cm) footprint, the modules are ideal for fixed and mobile wireless applications, as well as challenging battery-operated applications.
The SPWF01Sx parts are released with an integrated full featured TCP/IP protocol stack with added web server and additional application service capabilities, such as REST API for accessing files on servers in the cloud and support for dynamic web pages with CGI/SSI functions to easily interact with the module and the host processor over the air.

For secure end-to-end communication with the cloud, an SSL/TLS stack is embedded in every module with no licensing charge. See application note AN4683 for details.

The SW package also includes an AT command layer interface for user-friendly access to the stack functionalities via the UART serial port. For details, see user manual UM1695.

It is always possible to upgrade the module firmware via UART and Over The Air (FOTA).

Out of the 1 MB extended Flash available on the SPWF01Sx.1y module, 512 KB of the Flash is dedicated to FW upgrade and the other 512 KB is dedicated to host proprietary files, organized in a file system image, accessible through the integrated web server.

FOTA is also possible with the SPWF01Sx.2y module, temporarily storing the FW in the external host Flash memory, if it exists.

ST may update the FW provided with the modules at any time. ST recommends that users regularly check for documentation and the current FW version available at www.st.com/wifimodules.

Key Features
 

• 2.4 GHz IEEE 802.11 b/g/n transceiver
• STM32 ARM Cortex-M3, with 64 KB RAM and 512 KB Flash memory
  • 1 MB extended Flash available on SPWF01Sx.1y
• Integrated TCP/IP protocol stack
  • 8 simultaneous TCP or UDP clients and 1 socket server
  • 1 TLS/SSL socket client supporting up to TLS 1.2, including common encryption algorithms: AES (128, 256), hash (MD5, SHA-1, SHA-256) and public key algorithms (RSA, ECC)
  • Web server supporting dynamic web pages
  • RESTful API to get and post web content
• WEP/WPA/WPA2 personal security
• System modes: Station, IBSS, and miniAP
• miniAP easily provisioned (SSID, PWD)
• Fast Wi-Fi reassociation after reset
• Firmware update via UART and Over The Air (FOTA); extended Flash on board with SPWF01Sx.1y
• TX power
  • 18.3 dBm @ 1 Mbps DSSS
  • 13.7 dBm @ 54 Mbps OFDM
• RX sensitivity
  • -96.0 dBm @ 1 Mbps DSSS
  • -74.5 dBm @ 54 Mbps OFDM
• 16 configurable GPIOs available
• UART interface to host system
• Advanced low-power modes
  • Standby with RTC: 43 µA
  • Sleep connected (DTIM=1): 15 mA
  • RX traffic: 105 mA typical
  • TX traffic: 243 mA typical @ 10 dBm
• Simple AT command set host interface through UART
• Small form factor: 26.92 x 15.24 x 2.35 mm
• Single voltage supply (3.3 V typical)
• Multiple antenna options:
  • Integrated antenna (SPWF01SA.xy versions)
  • Integrated u.fl connector (SPWF01SC.xy versions)
• Industrial temperature range: -40 °C to 85 °C
• FCC/CE/IC/SRRC certified
• RoHS compliant
• Surface mount PCB module

 Evaluation tool

The SPWF01SA intelligent Wi-Fi module is supported by the X-NUCLEO-IDW01M1 Wi-Fi evaluation board based on the SPWF01SA module, which expands the STM32 Nucleo boards. The CE, IC and FCC certified SPWF01SA module has an embedded STM32 MCU, a low-power Wi-Fi b/g/n SoC with integrated power amplifier and power management and an SMD antenna. The SPWF01SA module is also equipped with 1 MByte of external FLASH for firmware update over-the-air (FOTA). The firmware features a complete software IP stack to open up to 8 TCP/UDP sockets, as well as dynamic web pages with SSI to interact with the module and a REST API (get & post) for conveniently transferring files to/from servers in the cloud. The module can simultaneously behave as a socket server and socket client. The firmware supports secure sockets with TLS/SSL encryption, ensuring secure end-to-end communications with the cloud, with or without authentication. The module operates as a client STA, IBSS, or miniAP (with up to 5 client STAs). The X-NUCLEO-IDW01M1 interfaces with the MCU on the STM32 Nucleo board via the UART serial port; the user can easily access the stack functions using the AT command. X-NUCLEO-IDW01M1 is compatible with both the ST morpho and Arduino UNO R3 connector layout.

Key Features
 

• X-NUCLEO-IDW01M1 hosts FCC, IC and CE certified SPWF01SA module (FCC ID: VRA-SG9011203, IC: 7420A-SG9011203 and ETSI compliant)
• SPWF01SA module major characteristics:
  • low power IEEE 802.11 b/g/n transceiver
  • integrated SMD antenna
  • STM32 ARM Cortex-M3, with 64 KB RAM and 512KB FLASH memory
  • 1 MByte extended flash for FW update over the air (FOTA)
  • integrated protocol stacks: TCP/IP, TLS/SSL
  • application layer functions: web server supporting dynamic web pages, REST API to get & post web content
  • WEP/WPA/WPA2 personal security
  • system modes: station, IBSS, and miniAP
  • 16 configurable GPIOs available
  • simple AT command set host interface through UART
• compatible with STM32 Nucleo boards
• equipped both with ST morpho connector and Arduino UNO R3 connectors
• scalable solution; it can cascade multiple boards for larger systems
• free development firmware library and examples, compatible with STM32Cube
• RoHS compliant

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