DS_FT230X Datasheet, PDF(11/44 Page) List of Unclassifed Manufacturers – Future Technology Devices International Ltd

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DS_FT230X Datasheet, PDF (11/44 Pages) List of Unclassifed Manufacturers – Future Technology Devices International Ltd

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3.3 CBUS Signal Options

FT230X USB TO BASIC UART IC

Version 1.2

Document No.: FT_000566 Clearance No.: FTDI# 260

The following options can be configured on the CBUS I/O pins. CBUS signal options are common to both

package versions of the FT230X. These options can be configured in the internal MTP memory using the

software utility FT_PROG or MPROG, which can be downloaded from the FTDI Utilities

(www.ftdichip.com). The default configuration is described in Section 8.

CBUS Signal

Option

Available On CBUS Pin

Description

TRI-STATE

DRIVE 1

DRIVE 0

TXDEN

PWREN#

TXLED#

RXLED#

TX&RXLED#

SLEEP#

CLK24MHz

CLK12MHz

CLK6MHz

GPIO

BCD Charger

BCD Charger#

BitBang_WR#

BitBang_RD#

CBUS0, CBUS1, CBUS2, CBUS3

IO Pad is tri-stated

Output a constant 1

Output a constant 0

Enable transmit data for RS485

Output is low after the device has been configured by

USB, then high during USB suspend mode. This output

can be used to control power to external logic P-Channel

logic level MOSFET switch. Enable the interface pull-down

option when using the PWREN# in this way.

Transmit data LED drive â pulses low when transmitting

data via USB. See Section 7.5 for more details.

Receive data LED drive â pulses low when receiving data

via USB. See Section 7.5 for more details.

LED drive â pulses low when transmitting or receiving

data via USB. See Section 7.5 for more details.

Goes low during USB suspend mode. Typically used to

power down an external TTL to RS232 level converter IC

in USB to RS232 converter designs.

24 MHz Clock output.*

12 MHz Clock output.*

6 MHz Clock output.*

CBUS bit bang mode option. Allows up to 4 of the CBUS

pins to be used as general purpose I/O. Configured

individually for CBUS0, CBUS1, CBUS2 and CBUS3 in the

internal MTP memory. A separate application note,

AN232R-01, available from FTDI website

(www.ftdichip.com) describes in more detail how to use

CBUS bit bang mode.

Battery charge Detect, indicates when the device is

connected to a dedicated battery charger host. Active

high output.

Inverse of BCD Charger

Synchronous and asynchronous bit bang mode WR#

strobe output.

Synchronous and asynchronous bit bang mode RD#

strobe output.

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