FT221XS-R datasheet(11/45 Pages) FTDI

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FT221X USB 8-BIT SPI/FT1248 IC Datasheet

Version 1.3

Document No.: FT_000630 Clearance No.: FTDI# 263

3.3 CBUS Signal Options

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

package versions of the FT221X. 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

CBUS3

IO Pad is tri-stated

DRIVE 1

CBUS3

Output a constant 1

DRIVE 0

CBUS3

Output a constant 0

PWREN#

CBUS3

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.

SLEEP#

CBUS3

Goes low during USB suspend mode. Typically used to

power down external logic.

CLK24MHz

CBUS3

24 MHz Clock output.*

CLK12MHz

CBUS3

12 MHz Clock output.*

CLK6MHz

CBUS3

6 MHz Clock output.*

GPIO

CBUS3

CBUS bit bang mode option. Allows the CBUS pin to be

used as general purpose I/O. Configured 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

CBUS3

Battery charge Detect, indicates when the device is

connected to a dedicated battery charger host. Active

high output.

BCD Charger#

CBUS3

Inverse of BCD Charger

BitBang_WR#

CBUS3

Synchronous and asynchronous bit bang mode WR#

strobe output.

BitBang_RD#

CBUS3

Synchronous and asynchronous bit bang mode RD#

strobe output.

VBUS Sense

CBUS3

Input to detect when VBUS is present.

Time Stamp

CBUS3

Toggle signal which changes state each time a USB SOF

is received

Keep_Awake#

CBUS3

Prevents the device from entering suspend state when

unplugged.

Table 3.7 CBUS Configuration Control

*When in USB suspend mode the outputs clocks are also suspended.

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