FT122 - Full speed USB device controller

Cost and feature optimized USB full-speed device controller with battery charger detection and internal clocking.

* End of Life 22nd January 2018 - no recommended replacements

* End of Life 22nd January 2018 - no recommended replacements

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 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)

For sales and technical development support from our in-house engineering team, please contact the Alpha Micro team.

  • USB 2.0 Full Speed compatible
  • High performance USB device controller with integrated SIE, endpoint buffer, transceiver and voltage regulators
  • Fully integrated clock generation with no external crystal required
  • Supports 8-bit parallel interface to external microcontroller
  • Supports DMA operation
  • Supports up to 8 bi-directional endpoints with total 2K bytes endpoint buffer
  • Max packet size is 504 bytes for isochronous endpoint and 64 bytes for control/bulk/ interrupt endpoint
  • Double buffer scheme for any endpoint increases data transfer throughput
  • Multiple interrupt modes to facilitate both bulk and isochronous transfers
  • USB Battery Charger detection allowing optimized charging profile
  • Dedicated clock output pin with programmable clock frequency (4 - 24 MHz)
  • 30 kHz output clock provided during suspend
  • Integrated DP pull-up resistor for USB connection
  • USB connection indicator that toggles with USB transmit and receive activities
  • Supports bus powered or self powered application
  • VCC power supply operation at 3.3V or 5V
  • Internal 1.8V and 3.3V LDO regulators
  • VCC IO level range from 1.8V to 3.3V
  • Integrated power-on-reset circuit
  • UHCI/OHCI/EHCI host controller compatible
  • -40°C to 85°C extended operating temperature range
  • Available in Pb-free TSSOP-28 and QFN-28 packages (RoHS compliant)

* End of Life 22nd January 2018 - no recommended replacements

Part Number Description Pack Size
FT122T-R 28-pin TSSOP single chip full speed USB device controller IC Reel of 2,500
FT122T-U
28-pin TSSOP single chip full speed USB device controller IC
Tube of 50
FT122Q-R
28-pin QFN single chip full speed USB device controller IC
Reel of 6,000

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Last updated: 21 May 2018