FT220XS-U FTDI, FT220XS-U Datasheet - Page 11

• Manufacturer Part Number: FT220XS-U
• Description: USB Interface IC USB to 4 bit SPI / FT1248 IC SSOP-16
• Manufacturer: FTDI

Specifications of FT220XS-U

• Rohs: yes
• Tradename: X-Chip

Keep_Awake#
BitBang_WR#
BitBang_RD#
BCD Charger
VBUS Sense
Time Stamp
TRI-STATE
CLK24MHz
CLK12MHz
Charger#
CLK6MHz
PWREN#
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 FT220X. These options can be configured in the internal MTP memory using the
software utility FT_PPROG, which can be downloaded from the FTDI Utilities (www.ftdichip.com). The
default configuration is described in Section 9.
Option
Table 3.7 CBUS Configuration Control
*When in USB suspend mode the outputs clocks are also suspended.
DRIVE 1
DRIVE 0
Signal
SLEEP#
CBUS
GPIO
BCD
Copyright © 2013 Future Technology Devices International Limited
Available On CBUS Pin
CBUS3
CBUS3
CBUS3
CBUS3
CBUS3
CBUS3
CBUS3
CBUS3
CBUS3
CBUS3
CBUS3
CBUS3
CBUS3
CBUS3
CBUS3
CBUS3
FT220X USB 4-BIT SPI/FT1248 IC Datasheet
IO Pad is tri-stated
Output a constant 1
Output a constant 0
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.
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 the CBUS pins to be
used as general purpose I/O. Configured in the internal
MTP
available from FTDI website (www.ftdichip.com) describes
in more detail how to use CBUS bit bang mode.
Battery Charger Detect, indicates when the device is
connected to a dedicated battery charger port. Active high
output.
Inverse of BCD Charger (open drain)
Synchronous and asynchronous bit bang mode WR#
strobe output.
Synchronous and asynchronous bit bang mode RD# strobe
output.
Input to detect when VBUS is present.
Toggle signal which changes state each time a USB SOF is
received
Prevents the device from entering suspend state when
unplugged. May be used if programming the MTP memory
over FT1248 interface.
Document No.: FT_000629 Clearance No.: FTDI# 262
memory
. A separate application note, AN232R-01,
Description
Version 1.2
11