2/4 channel USB interface ICs, with module option

April 13, 2016 // By Graham Prophet
To provide engineers with a greater breadth of IO options and also address demands to conserve board real estate, FTDI has added versions of its FT2232H and FT4232H devices: these configurable USB 2.0 Hi-Speed (supporting 480 Mbit/sec operation) ICs are now available in 56-pin VQFN packages, which complement the 64-pin LQFP package format.

The added pinout options are, FTDI says, easier to place and route on PCBs, as well as being better suited to space-constrained electronic designs. FT2232H and FT4232H incorporate 2 and 4 UARTs respectively. To maximise application flexibility, both channels on the FT2232H, and two of the four channels on the FT4232H can be independently configured in a wide variety of different industry-standard serial interfaces. This is accomplished via a multi-protocol synchronous serial engine (MPSSE), which allows emulation of JTAG, SPI, I ²C, bit-bang or other synchronous serial modes. Both the FT2232H-56Q and FT4232H-56Q are also offered in mini modules. These small dual-inline PCBs have attached micro-USB connectors to ease interfacing with external infrastructure.


Applications for these ICs/modules are the upgrading legacy peripheral designs to accept USB, and field updating of equipment: plus USB instrumentation, smart card readers, industrial control systems, bar code readers, USB flash drive reader/writers and interfaces for portable electronics goods (MP3 players, digital cameras, etc.)


Each IC integrates a 1.8V LDO voltage regulator, integrated POR and clock multiplier PLL (covering frequencies from 12 MHz to 480 MHz). The baud rate generator allows data transfer at non-standard as well as standard speeds. Since the USB protocol is taken care of on-chip, there is no need for USB specific firmware to be created (thereby reducing development times). These ICs are supported by a broad array of USB drivers, for Windows, Mac and Linux operating systems. The -40°C to 85°C operating temperature range means they are suited to industrial deployment.


FTDI Chip; www.ftdichip.com/Products/ICs/FT2232H.html and www.ftdichip.com/Products/ICs/FT4232H.htm