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
VCC
VCC
Ferrite
D0
D1
D2
D3
D4
D5
D6
D7
I/O10
I/O11
I/O12
I/O13
Bead
1
2
3
4
VCC
27R
27R
USBDM
USBDP
+
FT240X
VCCIO
I/O14
I/O15
10nF
5
RESET#
SHIELD
I/O16
I/O17
GND
Vcc
100nF
4.7uF
RXF#
TXE#
RD#
I/O20
I/O21
I/O22
+
3V3OUT
A
G
N
D
GND
G
N
D
USBDP
USBDM
WR#
I/O23
I/O24
100nF
GND
PWREN#
Vcc
47pF
47pF
10k
GND
GND
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.
Copyright © 2013 Future Technology Devices International Limited
25
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