AR9331 A minimal OpenWrt Linux system Core module

The AR9331 is a minimal system which installed with OpenWrt Linux system and support 2.4G WiFi It is compatible with 802.11b/g/n has rich interface such as Ethernet, USB, UART and plenty of GPIOs and use small outline package, it is used widely in mini routers and IoT projects.

Specification

• CPU: ATHEROS AR9331 chipset, which integrates MIPS 24Kc processor, CPU 400MHz, Switch (MAC, PHY) and integrates with MAC, RF, PA and LNA for WiFi. 
• RAM : 64MB;
• Flash : 16MB
• Interfaces: 3 x RJ45, 1 x USB Host, 1 x UART, USB2.0, SPI, I2S, SLIC, SPDIF, JTAG, 9xLEDs and 29 GPIOs
• OS: Open Source OpenWrt 
• Power: 3.3v power input
• WiFi: Support 150M 2.4Ghz WiFi, 802.11 b/g/n
• Frequency range: 2.4~2.4835GHz
• Modulation: BPSK, QPSK, CCK and OFDM (BPSK/QPSK/16-QAM/ 64-QAM)
• Sensitivity @PER : 135M : -65dBm@10%PER; 65M : -65dBm@10%PER; 54M : -68dBm@10%PER; 11M : -84dBm@8% PER; 6M : -88dBm@10% PER; 1M : -90dBm@8% PER
• Typical Distance: Indoor: 60m (max); Outdoor 150m (max) (with 2 dBi antenna) 
• RF Power: 11n: 13dBm; 11g: 13-15dBm, 11b: 16-18dBm,
• Connector: I-PEX connector. Provide Optional ANT pin out for SMT
• Dimension:41x25x3.8mm

Applications: 

• Internet of Things
• Voice over IP
• Mesh WiFi
• 3G/4G router
• Industrial Control

Useful Link:

Datasheet

Gerenal Reference Design:  Start Kit