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FT312D-32Q1C-T Datasheet(PDF) 8 Page - Future Technology Devices International Ltd. |
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FT312D-32Q1C-T Datasheet(HTML) 8 Page - Future Technology Devices International Ltd. |
8 / 27 page Copyright © 2013 Future Technology Devices International Limited 8 DS_FT312D USB ANDROID HOST IC Datasheet Version 1.1 Document No.: FT_000816 Clearance No.: FTDI# 331 4 Function Description The FT312D is FTDI’s second dedicated Android Open Accessory Mode integrated circuit device or Android Host. The FT312D USB host port is dedicated to support of the Android Open Accessory class and will bridge data between this port and the UART interface. 4.1 Key Features Easy to use Android Open Accessory IC translating the Device port of the Android device into UART capabilities 4.2 Functional Block Descriptions The following paragraphs describe each function within FT312D. Please refer to the block diagram shown inFigure 2.1. 4.2.1 UART Interface Module The FT312DUART module controls the UART interface providing basic RXD, TXD signalling with RTS#/CTS# hardware flow control. An additional TX_Active signal is supplied to control external RS485 transceivers for users wishing to create a USB to RS485 bridge. The UART supports baud rates from 300 baud to 921600 baud. A full description of the UART module is provided in Section 5. 4.2.2 Buffers The FT312D provides internal buffering between the USB port and the UART port of the IC for smooth data streaming. The Android device can send NAK’s to the USB OUT token sent from the FT312D. This can happen when the UART application on the Android is running in the background or multiple applications are launched in the Android device. When the UART application on the Android device is not accepting data, the data will be buffered in the UART RX buffer in FT312D. The UART RX buffer size is 5512 bytes. The UART_TX buffer which stores data from the USB port, heading for the UART is 256 bytes. 4.2.3 USB Host The USB Host block handles the parallel-to-serial and serial-to-parallel conversion of the USB physical layer. This includes bit stuffing, CRC generation. 4.2.4 USB Transceivers USB transceiver cells provide the physical USB device interface supporting USB 1.1 and USB 2.0 standards. Low-speed and full-speed USB data rates are supported. The output driver provides 3V3 level slew rate control signalling, whilst a differential receiver and two single ended receivers provide USB DATA IN, SE0 and USB Reset condition detection. These cells also include integrated internal pull-down resistors as required for host mode. 4.3 Default Descriptor Strings When the USB port is connected to the Android USB port, the Android platform will determine which application to load based on the strings read from the FT312D. These strings are configurable with a Windows utility: FT312D_Cofiguration available for download from the FTDI website. http://www.ftdichip.com Please refer to the application note AN_236 User Guide for FT312D Configuration to change the default string values. |
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