1. Introduction 2181R-IA is a highly integrated module with low power 802.11b/g/n Wireless LAN(WLAN) network controller. It combines an ARM-CM4 MCU, WLAN MAC, a 1T1R capable WLAN baseband, and RF function. It also provides a bunch of configurable GPIO which are configured as digital peripherals for different applications and control usage. 2181R-IA integrates internal memories for complete WIFI protocol functions. 2181R-IA integrates 512KB ROM to provide high access speed, low leakage memory. The ROM memory clock speed is up to 125MHz.The ROM lib provides the following functions: Boot Code and MCU initialization. Default UART driver. Non-flash booting functions and drivers. Peripheral libs. Security functions libs.
2. Features General 22.6mm*13.0mm*2.1mm CMOS MAC, Baseband PHY, and RF in the module for 802.11b/g/n compatible WLAN Complete 802.11n solution for 2.4G band 150Mbps receive PHY rate and 150Mbps transmit PHY rate using 40MHz bandwidth 128K Bytes SRAM for user Integrated 8Mbit SPI flash in package Standards Supported 802.11b/g/n compatible WLAN 802.11e QoS Enhancement(WMM) 802.11i(WPA,WP2). Open, shared key, and pair-wise key authentication services WiFi Direct support Light Weight TCP/IP protocol WLAN PHY Features 802.11n OFDM One Transmit and one Receivepath(1T1R) 20MHz and 40MHz bandwidth transmission Short Guard Interval(400ns) Maximum data rate 54Mbps in 802.11g and 150Mbps in 802.11n Host Interface UART×2/I2S×2 I2C×1 PWM×8 SPI×4 SDMMC×1 USB2.0×1