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PDF FT232BL Data sheet ( Hoja de datos )
| Número de pieza | FT232BL | |
| Descripción | USB UART IC | |
| Fabricantes | Future Technology Devices | |
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Document No.: FT_000329
FT232BL/BQ USB UART IC Datasheet Version 2.2
Clearance No.: FTDI# 171
Future Technology
Devices International Ltd.
FT232BL/BQ USB UART IC
The FT232B is a USB to serial UART
interface with the following advanced
features:
Single Chip USB to Asynchronous Serial
Data Transfer
Full Handshaking & Modem Interface
Signals
UART I/F Supports 7 / 8 Bit Data, 1 / 2
Stop Bits and Odd/Even/Mark/Space/No
Parity
Data rate 300 => 3M Baud (TTL)
Data rate 300 => 1M Baud (RS232)
Data rate 300 => 3M Baud
(RS422/RS485)
384 Byte Receive Buffer / 128 Byte
Transmit Buffer for high data throughput
Adjustable RX buffer timeout
Fully Assisted Hardware or X-On / X-Off
Handshaking In-built support for event
characters and line break condition
Auto Transmit Buffer control for RS485
Support for USB Suspend / Resume
through SLEEP# and RI# pins
4.35V to 5.25V single supply operation
Support for high power USB Bus powered
devices through PWREN# pin
Integrated level converter on UART and
control signals for interfacing to 5V and
3.3V logic
Integrated 3.3V regulator for USB IO
Integrated Power-On-Reset circuit
Integrated 6MHz – 48Mhz clock multiplier
PLL
UHCI / OHCI / EHCI host controller
compatible
USB 1.1 and USB 2.0 compatible
USB VID, PID, Serial Number and Product
Description strings in external EEPROM
EEPROM programmable on-board via USB
Available as a compact lead free RoHS
compliant 32-LD LQFP package (FT232BL) or
32-LD QFN package (FT232BQ).
Neither the whole nor any part of the information contained in, or the product described in this manual, may be adapted or reproduced
in any material or electronic form without the prior written consent of the copyright holder. This product and its documentation are
supplied on an as-is basis and no warranty as to their suitability for any particular purpose is either made or implied. Future Technology
Devices International Ltd will not accept any claim for damages howsoever arising as a result of use or failure of this product. Your
statutory rights are not affected. This product or any variant of it is not intended for use in any medical appliance, device or system in
which the failure of the product might reasonably be expected to result in personal injury. This document provides preliminary
information that may be subject to change without notice. No freedom to use patents or other intellectual property rights is implied by
the publication of this document. Future Technology Devices International Ltd, Unit 1, 2 Seaward Place, Centurion Business Park,
Glasgow G41 1HH United Kingdom. Scotland Registered Company Number: SC136640
Copyright © 2011 Future Technology Devices International Limited
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1 page  
Document No.: FT_000329
FT232BL/BQ USB UART IC Datasheet Version 2.2
Clearance No.: FTDI# 171
Appendix C – Revision History ................................................................... 33
Copyright © 2011 Future Technology Devices International Limited
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5 Page 
Document No.: FT_000329
FT232BL/BQ USB UART IC Datasheet Version 2.2
Clearance No.: FTDI# 171
possibilities exist. For instance, it may be possible to connect the device to an SRAM configurable FPGA as
supplied by vendors such as Altera and Xilinx. The FPGA device would normally be un-configured (i.e.
have no defined function) at power-up. Application software on the PC could use Bit Bang Mode to
download configuration data to the FPGA which would define its hardware function, then after the FPGA
device is configured the FT232B can switch back into UART interface mode to allow the programmed
FPGA device to communicate with the PC over USB. This approach allows a customer to create a
“generic” USB peripheral whose hardware function can be defined under control of the application
software. The FPGA based hardware can be easily upgraded or totally changed simply by changing the
FPGA configuration data file. Application notes, software and development modules for this application
area will be available from FTDI and other 3rd parties.
PreScaler Divide By 1 Fix. The previous device had a problem when the integer part of the divisor was
set to 1. In the 2nd generation device setting the prescaler value to 1 gives a baud rate of 2 million baud
and setting it to zero gives a baud rate of 3 million baud. Non-integer division is not supported with
divisor values of 0 and 1.
Less External Support Components. As well as eliminating the RCCLK RC network, and for most
applications the need for an external reset circuit, we have also eliminated the requirement for a 100K
pull-up on EECS to select 6MHz operation. When the FT232B is being used without the configuration
EEPROM, EECS, EESK and EEDATA can now be left n/c. For circuits requiring a long reset time (where the
device is reset externally using a reset generator I.C., or reset is controlled by the IO port of a MCU,
FPGA or ASIC device) an external transistor circuit is no longer required as the 1.5k pull-up resistor on
USBDP can be wired to the RSTOUT# pin instead of to 3.3V. Note : RSTOUT# drives out at 3.3V level,
not at 5V VCC level. This is the preferred configuration for new designs.
Extended EEPROM Support. The previous generation of devices only supported EEPROM of type 93C46
(64 x 16 bit). The new devices will also work with EEPROM type 93C56 (128 x 16 bit) and 93C66 (256 x
16 bit). The extra space is not used by the device, however it is available for use by other external MCU /
logic whilst the FT232B is being held in reset.
USB 2.0 (full speed option). A new EEPROM based option allows the FT232B to return a USB 2.0
device descriptor as opposed to USB 1.1. Note : The device would be a USB 2.0 Full Speed device
(12Mb/s) as opposed to a USB 2.0 High Speed device (480Mb/s).
Multiple Device Support without EEPROM. When no EEPROM (or a blank or invalid EEPROM) is
attached to the device, the FT232B no longer gives a serial number as part of its USB descriptor. This
allows multiple devices to be simultaneously connected to the same PC. However, we still highly
recommend that EEPROM is used, as without serial numbers a device can only be identified by which hub
port in the USB tree it is connected to which can change if the end user re-plugs the device into a
different port
Copyright © 2011 Future Technology Devices International Limited
11
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| PDF Descargar | [ Datasheet FT232BL.PDF ] | |
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