FT2232HQ-REEL FTDI, FT2232HQ-REEL Datasheet - Page 37

• Manufacturer Part Number: FT2232HQ-REEL
• Description: USB Interface IC USB HS to Dual UART/ FIFO/SPI/JTAG/I2C
• Manufacturer: FTDI

Specifications of FT2232HQ-REEL

• Mounting Style: SMD/SMT
• Package / Case: QFN
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

4.8.3 Fast Opto-Isolated Serial Data Interface Example
The following example,Figure 4.16 , shows two Agilent HCPL-2430 (see the semiconductor section at
www.agilent.com) high speed opto-couplers used to optically isolate an external device which
interfaced to USB using the FT2232H. In this example VCC5V is the USB VBUS supply and VCCE is the
supply to the external device.
Care must be taken with the voltage used to power the photo-LED‟s. It must be the same voltage as that
the FT2232H I/Os are driving to, or the LED‟s may be permanently on. Limiting resistors should be fitted
in the lines that drive the diodes. The outputs of the opto-couplers are open-collector and require a pull-
up resistor.
Figure 4.16 Fast Opto-Isolated Serial Interface Example
FT2232H
FSCLK
FSCTS
FSDO
FSDI
Copyright © 2010 Future Technology Devices International Limited
VCC5V
1K
VCC5V
470R
470R
1K
7
6
5
8
FT2232H DUAL HIGH SPEED USB TO MULTIPURPOSE UART/FIFO IC
HCPL-2430
3
4
1
2
Cable
3
1
2
4
HCPL-2430
Document No.: FT_000061
Clearance No.: FTDI#77
Datasheet Version 2.10
5
1K
7
6
8
1K
470R
470R
VCCE
VCCE
CLK
DI
DO
CTS
37