TP-Link WR703N Expander

• Compact size - designed to piggy back above WR703N router PCB
• Uplink USB port can be via mini-B, or 4 pin header to connect to WR703N
• 3 available USB ports with alternate connection options (4 pin header or USB A female)
• 2 FTDI virtual COM (serial) ports – using common 6 pin FTDI pinout (with RTS/CTS)
• Selectable 3.3V or 5V I/O voltages for Port A and Port B
• 8 GPIO (part of Port A) – see GPIO pinout below
• EEPROM for use with FTDI FT_PROG configuration utility
• Incorporates FTDI MPSSE functions – allows SPI/I2C/JTAG emulation (e.g. see FTDI App Note AP_135)
• Can be powered from WR703N, or supply power to WR703N (short R113 on router)
• Works with most operating systems (FTDI driver required)
• Open source hardware design
• Info on OpenWRT and the WR703N available at http://wiki.openwrt.org/toh/tp-link/tl-wr703nandhttp://www.madox.net/blog/projects/tp-link-tl-wr703n/

• 3D printable enclosure available at http://www.thingiverse.com/thing:25389

• Uses Genesys Logic GL850G USB hub IC, and FT2232L dual serial IC
• Connectors for USB and I/O come separately to allow end user customisation
• Weight: approx 7g-20g (depending on connectors installed)
• Size: 48x50x3mm (without connectors)
• PDFSchematic
• Eagle design files SCH&BRD

GPIO pinout (OC = Open Collector)

J1 pin    FT2232 name       VCP function (Port A)