Power Electronics
IO-Packed and Power Efficient USB 2.0 to SPI/I2C Bridge Chip

IO-Packed and Power Efficient USB 2.0 to SPI/I2C Bridge Chip

The FT4222H from FTDI Chip 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 (75 mA 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 toperformance 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. The battery charger detection function furnishes USB peripherals that incorporate this IC with the ability to detect connection with a dedicated charging port (DCP) and thereby benefit from more rapid charging. FTDI Chip's proprietary, royalty-free USB drivers for the Windows operating system mean that engineers can, in the majority of circumstances, avoid the inconvenience having to develop their own drivers.

The FT4222H is offered in a compact, Pb-free 32-pin QFN package and an operational temperature range that spans from -40 °C to 85 °C makes this device suitable for use in demanding industrial environments. It is priced at £1.54 each for 1000 unit volumes.

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