Copyright © 2013 Future Technology Devices International Limited

8

DS_FT311D

USB ANDROID HOST IC Datasheet

Version 1.2

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

Pin

No.

Name

Type

Description

31

IOBUS6

INPUT/OUTPUT

I/O signal. Function depends on CNFG pin setting. See table 3.4

Table 3.3 Interface Pins

Notes:

1. When used in Input Mode, the input pins are pulled to VCCIO via internal 75kΩ (approx.) resistors.

3.2 Interface Selection

The FT311D has multiple interfaces available for connecting to external devices. The resources available

are GPIO, UART, PWM, I2C(Master), SPI(Slave) and SPI(Master). The selection of what interface the user

requires is configured using the CNFG0, CNFG1 and CNFG2 input pins as per table 3.4.

CNFG2

CNFG1

CNFG0

Mode

GND

GND

GND

GPIO

GND

GND

Leave

Open

UART

GND

Leave

Open

GND

PWM

GND

Leave

Open

Leave

Open

I2C (Master)

Leave

Open

GND

GND

SPI (Slave)

Leave

Open

GND

Leave

Open

SPI (Master)

Table 3.4 CBUS Configuration Control

Note 1: When left open the pin is a logic 1.

Note 2: Mode “110” is a factory test mode and should not be used.

Note 3: Mode “111” will default to GPIO mode.

3.2.1 Interface pinout

The actual pinout for each interface type is detailed in table 3.5

Pin No

Pin

Name

GPIO

UART

PWM

I2C

(Master)

SPI

(Slave)

SPI

(Master)

23

IOBUS0

GPIO0

UART_TXD

PWM0

I2C_CLK

-

-

24

IOBUS1

GPIO1

UART_RXD

PWM1

I2C_DATA

-

-

25

IOBUS2

GPIO2

UART_RTS

#

PWM2

-

-

-

26

IOBUS3

GPIO3

UART_CTS

#

PWM3

-

SPI_S_SS0

SPI_M_SS0