The RN-171-XV series from Microchip are certified IEEE 802.11b/g WiFi modules that incorporate a 32 bit SPARC processor, TCP/IP stack, real-time clock, crypto accelerator, power management unit and an analogue sensor interface. These modules are specially designed to allow the migration from existing 802.15.4 architecture to a more standard TCP/IP-based platform without the need for hardware redesign.

RF Carrier Frequency: 2.4GHz ISM Band
RF Transmit Power: up to +12dBm
Receiver sensitivity: -83dBm
Host communication: serial UART
Host data rate: 464kbps with RTS/CTS flow control
8 x GPIO pins
3 x analogue sensor inputs
Real-time clock for wakeup and time stamping
Antenna options: Wire (RS 769-4144), SMA connector (RS 769-4141), U.FL connector (RS 841-7481)
On-board TCP/IP stack
No custom profiles needed
Embedded networking applications: DHCP, DNS, ARP, ICMP UDP, Telnet, FTP client and HTML client
Security: WEP, WPA and WPA2-PSK
WPS mode for easy configuration
Drop in WiFi replacement for existing systems that currently use 802.15.4 modules
Ultra-low power: 4μA sleep, 40mA Rx, 180mA Tx @ 10dBm
Power supply: +3.0V to +3.7Vdc
Operating temperature range: -40 to +85°C
FCC/CE/ICS certified
Applications: Industrial metering, HVAC control, Room temperature sensors, Pump configuration and control, Telemetry, PV/solar controllers, Robotics, local communication for the Internet of Things (IoT)

WLAN (Wireless Local Area Network) - Microchip Technology