Future Technology Devices International Limited (FTDI), available from Glyn High-Tech Distribution introduces the FT311D in continuation of the Android Open Accessories initiative.
This new USB Full Speed (12 Mbit/s) host IC is specifically targeted at providing Android platforms such as tablet PCs or smartphones with interconnectivity to end product systems through the utilisation of USB technology.
Launched by Google a little over a year ago, the Android Open Accessories specification uses industry-standard USB technology with an additional enumeration step. As a result, the USB connection allows the Android platform to function as a USB slave/peripheral, eliminating the need to source power, store class drivers, and support the USB host stack, which has responsibility for controlling the USB bus. In the end, the USB host functions are now relegated to the end product, which is connecting to the Android platform.
The FT311D runs off a standard 3.3 V supply and draws a current of just 25 mA in full operation at 48 MHz and 128 µA while in standby mode. It has the capacity to bridge the USB port to six different user selectable interface types, namely GPIO, UART, PWM, I2C master, SPI slave and SPI master. It can be utilised in conjunction with any platform that supports the Android Open Accessory mode.
When the IC’s peripheral interface is configured in UART mode, the interface implements a basic asynchronous serial UART port with flow control. The FT311D’s UART can support data rates of between 300 bit/s and 6 Mbit/s, while its I2C master interface can connect to I2C slave interfaces supporting speeds of up to 125 kbit/s.
The interface can also be configured to provide 4 pulse width modulation (PWM) outputs, which can be used to generate PWM signals for controlling the motors, actuators, sensors, DC/DC converters and AC/DC supplies found in systems such as toys, lighting applications, home automation, and industrial equipment.
A development module (UMFT311EV) based on the FT311D is also available featuring board dimensions of 68.58mm x 55.38mm x 14.00mm, and intended for use as a hardware platform to enable easy evaluation of the IC and allow engineers to develop a broad range of Android Open Accessory compliant applications.
Selection of the desired interface mode is done using a series of jumpers. This module is complemented by a 66.60mm x 55.38mm x 22mm form factor GPIO shield board (UMFT311GP), which has push button keypad that acts as a user input and a set of 8 LED emitters that can be deployed to illustrate an active output.
FTDI’s CEO and founder Fred Dart says that the new host IC strengthens their portfolio of Android related products for engineers to explore the new possibilities offered by the Open Accessories mode. He adds that the new chip, plus their development tools, software and application support will together simplify USB host integration into customers’ end products.
The FT311D is supplied in 32-pin QFN and LQFP package options. These ICs have an operational temperature range that covers -40°C to +85°C.