2.General Description MT7668SN is highly integrated single chip which features a low power 2x2 11a/b/g/n/ac dual-band Wi-Fi subsystem and a Bluetooth subsystem. The Wi-Fi subsystem contains the 802.11a/b/g/n/acradio， baseband， and MAC that are designed to meet both the low power and high throughput application. MT7668S N has a 32-bit RISC MCU that handles Wi-Fi and Bluetooth tasks， and an ARM Cortex-R4 MCU that could offload data frame processing in Wi-Fi host driver. The Bluetooth subsystem contains the Bluetooth radio， baseband， link controller. It also uses the 32-bit RISC MCU for the Bluetooth protocols. 3. Features n Highly integrated 28nm RFCMOS technology n 9x9 QFN76 pins package n Integrate high efficiency power management unit with single 3.3V power supply input n 26， 40， 52MHz crystal clock support with low power operation in idle mode n Buffered clock output for co-clock with other SOC chipset n 32-bit RISC MCU for Wi-Fi/Bluetooth protocols n ARM Cortex-R4 MCU for Wi-Fi offload n Embedded SRAM/ROM n SDIO device fully complianttoSDIO3.0 specification n UART interface with hardware flow control n Programmable and multiplexed GPIO pins n IEEE 802.11 a/b/g/n/ac compliant n Support 20MHz， 40MHz， 80Mhz bandwidth in 2.4GHz band 5GHz band n Dual-band 2T2R mode， data rate up to 450Mbpswith SDIO3.0. n Support MU-MIMO RX and DBDC （dual band dual concurrent） n Support STBC， LDPC， TX Beamformer and RX Beamformee n Greenfield， mixed mode， legacy modes support n IEEE 802.11 d/e/h/i/j/k/mc/r/v/w support n Security support for WFA WPA/WPA2 personal， WPS2.0， WAPI n QoS support of WFA WMM， WMM PS n Integrated LNA， PA， and T/R switch n Bluetooth specification 2.1+EDR n Bluetooth 4.2Low Energy （LE）