The FT4222H is a High/Full Speed USB2.0-to-Quad SPI/I²C device controller in a compact 32-pin QFN package. The device requires an external crystal at 12MHz in order for the internal PLL to operate. It supports multi-voltage IO: 1.8/2.5 and 3.3V and provides 128 bytes one-time-programmable (OTP) memory space for storing vendor-specific information.

This device contains both SPI and I²C configurable interfaces. The SPI interface can be configured as master mode with single, dual and quad bits data width transfer, or slave mode with single bit data width transfer. The I²C interface can be configured in master or slave mode.

The FT4222H is available in in a space saving Pb-free (RoHS compliant) 32-pin QFN package.

• Single chip USB2.0 Hi-speed to SPI/I²C bridge with a variety of configrations.
• Entire USB protocol handled on the chip. No USB specific firmware programming required.
• On-chip OTP memory for USB Vendor ID (VID), Product ID (PID), device serial number, product description string and various other vender specific data
• Configurable industry standard SPI Master/Slave interface controller
• Support configurable data width with single, dual, quad data width transfer mode in SPI master
• SCK can support up to 30MHz in SPI master
• Up to 28Mbps data transfer rate in SPI master with quad mode transfer
• Support single bit data transfer with full-duplex transfer in SPI Slave register.
• Support up to 4 channels slave selection control pins in SPI master application
• Configurable I²C Master/Slave interface controller conforming to I²C v2.1 and v3.0 specification
• Supports 100kbit/s standard mode (SM), 400 kbit/s fast mode (FM), 1 Mbit/s Fast mode plus (FM+), and 3.4 Mbit/s High Speed mode (HS)
• Configurable GPIOs can be easily controlled by software applications via USB bus
• USB Battery Charger Detection. Allows for USB peripheral devices to detect the presence of a higher current power source to enable faster charging

• Device supplied pre-programmed with unique USB serial number
• USB Power Configurations; supports bus- powered, self-powered and bus-powered with power switching
• +5V USB VBUS detection engine
• True 3.3V CMOS drive output and TTL input. (operates down to 1V8 with external pull-ups)
• Configurable I/O pin output drive strength; 4 mA(min) and 16 mA(max)
• Integrated power-on-reset circuit
• USB2.0 Low operating and suspend current; 68mA (active-typ) and 375µA (suspend-typ)
• UHCI/OHCI/EHCI host controller compatible
• FTDI Chip’s royalty-free Direct (D2XX) drivers for Windows eliminate the requirement for USB driver development in most cases
• Extended operating temperature range; -40°C to 85°C
• Available in compact Pb-free 32 Pin VQFN packages (RoHS compliant).

• USB to single mode SPI master controller
• USB to dual mode SPI master controller
• USB to quad mode SPI master controller
• USB to single SPI slave controller
• USB to I²C master interface controller
• USB to I²C slave interface controller
• Utilising USB to add system modularity

• Incorporate USB interface to enable PC transfers for development system communication
• USB Industrial Control
• USB Data Acquisition
• Accessory connectivity solutions for mobiles and tablets
• USB dongle implementations for Software/ Hardware Encryption and Wireless Modules
• Detect USB dedicated charging ports, to allow for high current battery charging in portable devices.

• FT4222H Datasheet
• FT4222H Errata Technical Note
• FT4222H Product Change Notification (PCN FT 028)
• FT4222H Product Change Notification (PCN FT 036)
• FT4222H Rev.D Technical Note
• AN_357 Android D2XX Demo Application for FT4222H
• AN_329 User Guide for LibFT4222
• AN_184 FTDI Device Input Output Pin States
• LibFT4222 Windows Library (v1.4.4) and Examples
This is a middleware library provided to make developing applications for FT4222H easy. The library sits over the D2XX driver and provides a range of APIs that are tuned for SPI and I²C application development.
Supports 32 and 64 bit applications.
Supports the rev A, the rev B, the rev C and the rev D.
• LibFT4222 Linux Library (v1.4.4.44) and Examples

Linux shared objects (for i386, x86_64 and ARMv6-hf) implementing the LibFT4222 API, with D2XX built-in. Includes C example code.
Supports the rev A, the rev B, the rev C and the rev D.
• LibFT4222 MAC OSX Library (v1.4.4.48) and Examples
Library files compatible with MAC OSX for accessing the LibFT4222 API and examples.
Support the rev A, the rev B, the rev C and the rev D.

• FT4222H Development Module
• UMFT4222PROG Datasheet
• UMFT4222PROG-IC Datasheet
• Android D2XX Driver and Sample Application
• D2XX Drivers
Required for Windows LibFT4222 applications. The Linux LibFT4222 already has D2XX built-in.