Note that this product is now obsolete and is
not recommended for new designs.
The FT122 provides a cost and feature optimized USB full-speed device controller. The design builds on the FT120, by adding battery charger detection and internal clocking to reduce the PCB space required to complete the design. Communicating with a micro-controller over the generic parallel interface the device will appear as another memory device on the processor bus, offering USB connectivity with bulk, isochronous or interrupt endpoints.
Key Hardware Features
USB 2.0 Full Speed compatible
Support for multiple interrupt modes to facilitate bulk and isochronous transfers
Fully autonomous DMA engines for fast data transfer
Supports high-speed parallel interface to external microcontroller
Separate address/data or multiplexed address/data bus
Integrated 2kbytes of configurable endpoint buffer
Double buffer scheme for main endpoint improves data transfer rates.
Dedicated clock output pin with programmable clock frequency (4 – 48 MHz)
Good USB connection indicator that blinks with USB transmit and receive activities
Internal clocking:- no external crystal required
Battery Charger Detection
Single power supply operation at 3.3V or 5V
Internal 1.8V and 3.3V LDO regulators
Extended operating temperature range : -40°C to 85°C
Available in Pb-free TSSOP-28 and QFN-28 packages (RoHS compliant)