FT245R_10 Datasheet, PDF(26/37 Page) Future Technology Devices International Ltd. – USB FIFO IC - Single chip USB to parallel FIFO bidirectional data transfer interface

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FT245R_10 Datasheet, PDF (26/37 Pages) Future Technology Devices International Ltd. – USB FIFO IC - Single chip USB to parallel FIFO bidirectional data transfer interface

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8 Application Examples

Document No.: FT_000052

FT245R USB FIFO IC Datasheet Version 2.10

Clearance No.: FTDI# 39

The following sections illustrate possible applications of the FT245R. The illustrations have omitted pin

numbers for ease of understanding since the pins differ between the FT245RL and FT245RQ package

options.

8.1 USB to MCU FIFO Interface

SHIELD

Vcc

100nF

VCC

Ferrite

Bead

10nF

GND

4.7uF

GND

100nF

GND

VCC

USBDM

USBDP

VCCIO

RESET#

OSCI

OSCO

FT245R

RXF#

TXE#

3V3OUT

RD#

GGGGE

NNNNS

WR#

DDDDT

PWREN#

Vcc

VCC

I/O10

I/O11

I/O12

I/O13

I/O14

I/O15

I/O16

I/O17

I/O20

I/O21

I/O22

I/O23

I/O24

10k

GND

Figure 8.1 USB to MCU FIFO Interface

A typical example of using the FT245R as a USB to Microcontroller (MCU) FIFO interface is illustrated in

Figure 8.1. 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

FT245R, when required.

Using PWREN# for this function is optional.

If the Remote Wakeup option is enabled in the internal EEPROM, during USB suspend mode RXF#

becomes an input which can be used to wake up the USB host controller by strobing the pin low.

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