Copyright © 2013 Future Technology Devices International Limited

25

FT240X USB 8-BIT FIFO IC Datasheet

Version 1.3

Document No.: FT_000626 Clearance No.:

FTDI# 259

7 Application Examples

The following sections illustrate possible applications of the FT240X. The illustrations have omitted pin

numbers for ease of understanding since the pins differ between the FT240XS and FT240XQ package

options.

7.1 USB to MCU FIFO Interface

A

G

N

D

G

N

D

100nF

3V3OUT

VCCIO

RESET#

+

100nF

4.7uF

Vcc

D0

D1

D2

D3

D4

D5

D6

D7

RXF#

WR#

RD#

TXE#

USBDP

USBDM

VCC

1

2

3

4

5

PWREN#

I/O10

I/O11

I/O12

I/O13

Ferrite

Bead

GND

GND

GND

+

GND

10nF

VCC

I/O14

I/O15

I/O16

I/O17

I/O20

I/O21

I/O22

I/O23

I/O24

Vcc

10k

SHIELD

VCC

FT240X

27R

27R

47pF

47pF

USBDM

GND

USBDP

Figure 7.1 USB to MCU FIFO Interface

A typical example of using the FT240X as a USB to Microcontroller (MCU) FIFO interface is illustrated in

Figure 7.1. This example uses two MCU I/O ports: one port (8 bits) to transfer data and the other port (4

or 5 bits) to monitor the TXE# and RXF# status bits and generate the RD# and WR strobes to the

FT240X, when required.

Using PWREN# for this function is optional.