Wi-Fi (IEEE 802.11)

 

Low Power IEEE 802.11 (Wi-Fi) Wireless Module

                                                                                                                  

LOW POWER Wi-Fi (IEEE 802.11) with UFL Antenna   

 

INTRODUCTION

The Wi-Fi module  is a complete Wi-Fi and networking solution and includes a 32-bit CPU, operating system, network stack, crypto accelerator, power management subsystem, real-time clock and a versatile sensor interface, allowing it to serve as a light weight networking slave or, with custom software, as a standalone host.


Enabling WiFi Connectivity with Minimum Software/Hardware Resources

The module manages all networking functions. It contains a  standard thin-client application running on the module that handles all networking tasks such as network scan, join network, establishTCP/IP connection and send/receive data. Since all networking functions are managed by the module, wireless Internet connectivity can be added to a system with an 8- or 16-bit application processor of limited hardware resources.  The application processor communicates to the module via a UART interface. The only hardware requirement for the host system, to add WiFi connectivity, is a simple 3-wire UARTinterface. The software integration is simple.   The module connects to the configured Wi-Fi network automatically when it turns on. The host controller can send and receive data through the UART to the TCP/IP network if the Wi-Fi network is available. The configuration of the module can be
changed through the simple ASCii UART command interface with minimum software resources.

 

Application-Specific Stand Alone system

Alternatively, since the module is user-programmable, a stand alone architecture can be chosen if the user application can be fit into the memory space of the module  In a stand alone architecture, the the module is the only processor in the sensor unit.  This minimizes the hardware necessary to implement a complete device node, resulting in the lowest  total solution cost. The user programs are stored in the flash memory on the module and running on the module using the available processing power.  A software developmenht environment to implement custom applications is available

Ultra Low-Power Consumption

The module has been designed from inception to maximize battery life and achieves ultra low-power consumption. The power conservation architecture operates in two modes: an active mode and a sleep mode. The active mode consumes 30-200mA depending on TX data density.

The sleep mode consumes less than 0.5mA. The user can maximize the battery life by keeping the module in the sleep mode most of time and waking it up when needed.

The host processor can issue a sleep command to put the module  into sleep mode for minimum power consumption. When in sleep mode, the real-time clock and sensor interface remain active. The host processor sends a wake up signal to a module signal line to wake up the module from sleep. The module can wake, and join a network using WPA2-PSK in under in 35msec. This allows it to stay asleep until required, but wake and join a network without any noticeable user delay.

KEY HARDWARE FEATURES

• Wi-Fi, 802.11b/g PHY/MAC at up to 54Mbps
• Flexible antenna choice: Chip, 2.9mm wire, UFL and SMA
• Wi-Fi Alliance pre-certified for WPA2-PSK
• Interface to your favorite microcontroller using UART
• 8 Mbit flash memory and 128 KB RAM
• General sensor interface for monitoring push buttons, audio signals,temperature, motion, and acceleration

• 11 GPIOs (GPIO 2-9, and 12-14) and 8 sensor pins for general use
• Real-time clock for wakeup and time stamps
• Supports ISO-24730-2 2.4GHz transmit and magnetic receive functionality, Wi-Fi
RTLS, and EPC Gen 2
• Direct battery operation. On-chip power regulators and power management
circuits
• Switched power supply for external sensors

KEY SOFTWARE FEATURES

 • Pre-installed  Thin-Client application firmware provides complete
networking functionality
• Infrastructure and Ad-Hoc mode support
• 802.11i: Open, WEP-40, WEP-128, WPA-PSK, WPA2-PSK
• TCP/IP, DHCP, UDP, DNS, ARP, ICMP
• Simple ASCii Command Set to configure the module
• Over the air TFTP firmware upgrade
• Sleep mode support
• Multiple application image support

Contact Factory for additional information

 

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