The FT260 from FTDI Chip is a human interface device (HID) class interface controller IC which can provide USB 2.0 Full Speed (12 Mbps) connectivity to a broad range of application scenarios. These include connection of touchscreens, computer peripherals and IoT sensing apparatus, as well as USB interfacing of microcontroller or programmable logic centric system designs, plus industrial automation equipment and USB instrumentation.
Supplied in compact 28-pin SSOP and 28-pin QFN package options, these USB bridge chips have dual HID interface support, with I²C and UART bus conversion capabilities. As the entire USB protocol is handled on the chip, the FT260 offering presents engineers with a plug-and-play solution that is simple to incorporate into contemporary embedded system designs.
The ICs employ standard class drivers, which means it is not necessary to worry about installing complex vendor-specific drivers. Their flexible I/Os mean they are compatible with 1,8 V to 3,3 V systems. During full operation only 24 mA of current is drawn and this drops to just 385 μA when in suspend mode.
When introduced, the FT260 was the first device of its kind to be compliant with the HID-over-I²C protocol, as specified by Microsoft with the release of Windows 8. A total of four different speed modes can be utilised while in I²C bus – standard mode (SM), fast mode (FM), fast mode plus (FM+) and high speed (HS) with 7-bit addressing supported. The integrated memory resource enables storage of customised USB descriptors.
The built-in oscillator PLL dispenses with the need for an external crystal, thereby saving space and lowering bill of materials costs. Furthermore, unlike competing ICs, the FT260 has a USB battery charger detection mechanism included, so that more efficient charging may be benefitted from.
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