FTDI Chip has long been regarded as synonymous with USB innovation and the company continues to introduce new semiconductor products that are helping engineers implement
better designs. The FT4222H is the latest addition to its expansive USB offering. Compliant with the USB 2.0 hi-speed standard, this is a feature-rich single chip bridging solution with I2C and multi-channel SPI interface capabilities.
With regard to SPI the device serves as a SPI Master/Slave interface controller and supports all 4 SPI modes (0, 1, 2, 3). It allows single, dual and quad data width transfer, so that total data rates of up to 27Mbit/s are possible. The integrated configurable I2C Master/Slave interface controller conforms completely with both I2C v2.1 and v3.0 specifications. Support is given for operation in 100kbit/s standard mode (SM), 400kbit/s fast mode (FM), 1Mbit/s fast mode plus (FM+) and 3.4Mbit/s high speed mode (HS). Configurable general purpose IOs (GPIOs) can be easily controlled by software applications via the USB bus. The USB 2.0 interface draws very little current either when it is active (75mA typical) or while in suspend mode (375µA typical).
As with other FTDI Chip USB device controllers, the USB protocol is fully taken care of by the IC itself, so that such activities do not waste valuable resources on the system microcontroller, which could lead to performance compromises being witnessed. The FT4222H’s integrated OTP memory allows the storage of USB vendor ID (VID), product ID (PID), device serial number and product description string information, along with various other items of vendor specific data.