User's Manual

Description
SPWF04SA, SPWF04SC
2/18
DocID025635 Rev 7
1 Description
The SPWF04SA and the SPWF04SC 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 module is available either configured with an embedded micro 2.45 GHz highly-efficient
ISM band antenna (SPWF04SA), or with an u.fl connector for external antenna connection
(SPWF04SC).
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 SPWF04Sx 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 (TBC) 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
(TBC).
It is always possible to upgrade the module firmware via UART and Over The Air (FOTA).
Inside of the 2 MB extended Flash available on the SPWF04S module, 1 MB of the Flash is
dedicated to FW upgrade and to host proprietary files, organized in a file system image,
accessible through the integrated web server.
FOTA is also possible with the SPWF04Sx module.
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.