Copyright © 2015 Future Technology Devices International Limited

8

FT234XD USB TO BASIC UART IC

Version 1.2

Document No.: FT_000753 Clearance No.: FTDI#324

Pin No.

Name

Type

Description

1

USBDM

INPUT/OUTPUT USB Data Signal Minus.

12

USBDP

INPUT/OUTPUT USB Data Signal Plus.

2

RESET#

INPUT

Reset input (active low).

Table 3.2 Common Function pins

Pin No.

Name

Type

Description

7

TXD

Output

Transmit Asynchronous Data Output.

10

RXD

Input

Receiving Asynchronous Data Input.

8

RTS#

Output

Request to Send Control Output / Handshake Signal.

11

CTS#

Input

Clear To Send Control Input / Handshake Signal.

6

CBUS0

I/O

Configurable CBUS I/O Pin. Function of this pin is configured in the

device MTP memory. The default configuration is TXDEN. See CBUS

Signal Options, Table 3.4.

Table 3.3 UART Interface and CBUS Group (see note 1)

Notes:

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

These pins can be programmed to gently pull low during USB suspend (PWREN# = “1”) by setting an

option in the MTP memory.