FT311D-32L1C-R datasheet(10/40 Pages) FTDI

10 / 40 page

DS_FT311D

USB ANDROID HOST IC Datasheet

Version 1.2

Document No.: FT_000660 Clearance No.: FTDI# 305

Function Description

FT311D is FTDIs Android Accessory Mode integrated circuit device or Android Host. The FT311D behaves

like a bridge between an Android device and the various I/O available. Selection of various modes is

performed using CNFGx pins.

4.1 Key Features

Easy to use Android accessory IC translating the Device port of the android tablet into either GPIO, UART,

PWM, I2C Master, SPI Slave or SPI Master capabilities

4.2 Functional Block Descriptions

The following paragraphs describe each function within FT311D. Please refer to the block diagram shown

in Figure 2.1.

4.2.1 Peripheral Interface Modules

FT311D has six peripheral interface modules available for selection. Full descriptions of each module are

provided in Section 5.



GPIO - General purpose I/O pins



UART



PWM



I2C Master



SPI Slave



SPI Master

4.2.2 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 +3.3V

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.

4.2.3 USB Host

These blocks handle the parallel-to-serial and serial-to-parallel conversion of the USB physical layer. This

includes bit stuffing, CRC generation.

4.3 I/O Peripherals Signal Names

Peripheral

Signal Name

Outputs

Inputs

Description

GPIO

gpio

General purpose I/O

UART

uart_txd

Transmit asynchronous data output

uart_rts#

Request to send control output

uart_rxd

Receive asynchronous data input

uart_cts#

Clear to send control input

uart_tx_active

UART active signal (typically used with RS485)

PWM

pwm

Pulse width modulation

I2C

I2c_scl

I2C bus serial clock line - slave

I2c_sda

I2C bus serial data line - slave

SPI Slave

spi_s_clk

SPI clock input

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