FT201XS-R datasheet(11/49 Pages) FTDI

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FT201X USB I2C SLAVE IC Datasheet

Version 1.4

Document No.: FT_000627 Clearance No.: FTDI# 264

3.3 CBUS Signal Options

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

package versions of the FT201X. These options can be configured in the internal MTP memory using the

software utility FT_PROG, which can be downloaded from the FTDI Utilities (www.ftdichip.com). The

default configuration is described in Section 9.

CBUS

Signal

Option

Available On CBUS Pin

Description

TRI-STATE

CBUS0, CBUS1, CBUS2, CBUS3, CBUS4,

CBUS5

IO Pad is tri-stated

DRIVE 1

CBUS0, CBUS1, CBUS2, CBUS3, CBUS4,

CBUS5

Output a constant 1

DRIVE 0

CBUS0, CBUS1, CBUS2, CBUS3, CBUS4,

CBUS5

Output a constant 0

PWREN#

CBUS0, CBUS1, CBUS2, CBUS3, CBUS4,

CBUS5

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 an external logic P-Channel

logic level MOSFET switch. Enable the interface pull-down

option when using the PWREN# in this way.

SLEEP#

CBUS0, CBUS1, CBUS2, CBUS3, CBUS4,

CBUS5

Goes low during USB suspend mode. Typically used to

power down an external logic.

CLK24MHz

CBUS0, CBUS1, CBUS2, CBUS3, CBUS4,

CBUS5

24 MHz Clock output.*

CLK12MHz

CBUS0, CBUS1, CBUS2, CBUS3, CBUS4,

CBUS5

12 MHz Clock output.*

CLK6MHz

CBUS0, CBUS1, CBUS2, CBUS3, CBUS4,

CBUS5

6 MHz Clock output.*

GPIO

CBUS0, CBUS1, CBUS2, CBUS3,

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.

BCD Charger

CBUS0, CBUS1, CBUS2, CBUS3, CBUS4,

CBUS5

Battery charge Detect, indicates when the device is

connected to a dedicated battery charger host. Active high

output.

BCD

Charger#

CBUS0, CBUS1, CBUS2, CBUS3, CBUS4,

CBUS5

Inverse of BCD Charger (open drain)

BitBang_WR#

CBUS0, CBUS1, CBUS2, CBUS3, CBUS4,

CBUS5

Synchronous and asynchronous bit bang mode WR#

strobe output.

BitBang_RD#

CBUS0, CBUS1, CBUS2, CBUS3, CBUS4,

CBUS5

Synchronous and asynchronous bit bang mode RD# strobe

output.

I2C_TXE#

CBUS0, CBUS1, CBUS2, CBUS3, CBUS4,

CBUS5

Transmit buffer empty, used to indicate to

I2C master

device status of the FT201EX transmit buffer

I2C_RXF#

CBUS0, CBUS1, CBUS2, CBUS3, CBUS4,

CBUS5

Receive buffer full, used to indicate to

I2C master device

status of FT201EX receive buffer

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