FT121 - Full speed USB device controller

The FTDI FT121 provides a cost and feature optimized USB full-speed device controller. The FT121 provides an SPI slave interface to the host processor and has internal clocking allowing for space optimised designs.

The FTDI FT121 provides a cost and feature optimized USB full-speed device controller. The device provides an SPI slave interface to the host processor and has internal clocking allowing for space optimised designs. Offering USB connectivity with bulk, isochronous or interrupt endpoints, the device also includes USB battery charger detection for recharging battery operated devices over USB.

Key features:

  • USB 2.0 Full Speed compatible
  • SPI slave interface to host processor
  • Support for multiple interrupt modes to facilitate bulk and isochronous transfers
  • Fully autonomous DMA engines for fast data transfer
  • Integrated 2 kbytes of configurable endpoint buffer
  • Double buffer scheme for main endpoint improves data transfer rates.
  • Good USB connection indicator that blinks with USB transmit and receive activities.
  • 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-16 and QFN-16 packages (RoHS compliant).


  • 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 Serial Parallel interface (SPI) slave to external microcontroller
  • 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
  • Integrated DP pull-up resistor for USB connection
  • 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-16 and QFN-16 packages (RoHS compliant)
  • Provide USB port to Microcontrollers
  • Provide USB port to FPGA's
  • USB Industrial Control
  • Mass storage data transfers for multitude of embedded systems applications, including medical, industrial data-logger, power-metering, and test instrumentation
  • Utilising USB to add system modularity
  • Isochronous support for video applications in security, industrial control, and quality inspections
Part Number Description Pack Size
FT121T-R 16-pin TSSOP single chip full speed USB device controller IC Reel of 2,500
FT121T-U
16-pin TSSOP single chip full speed USB device controller IC
Tube of 96
FT121Q-R
16-pin QFN single chip full speed USB device controller IC
Reel of 6,000
UMFT12XEV Main board for evaluating FT120, FT121 and FT122 add-on modules. Fitted with LPC1114 Cortex-M0 MCU. Firmware upgradable with UART or SWD interface. Note: Board is shipped with firmware to support CDC class devices pre-loaded Each
UMFT121DC FT121 add-on module. SPI slave bus. 8 bi-directional endpoints. I/O level 1.8/2.5/3.3V.
Each

The FTDI UMFT12 Evaluation Kit provides a complete evaluation and prototyping platform for FT12 series devices. The UMFT12XEV contains an LPC1114 controller to host the FT12X daughter card to enable testing of firmware for the FT12 series devices. Each device (FT120, FT121, and FT122) has a separate daughter card to plug in to the UMFT12XEV and a mini-B USB connector for attaching to external USB host controllers.

AlphaMicro_FTDI_UMFT12xEV(02)_180pxAlphaMicro_FTDI_UMFT121A(02)_180px

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Last updated: 11 August 2013