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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

Summary of content (34 pages)

PAGE 1
Document No.: FT_000329 FT232BL/BQ USB UART IC Datasheet Version 2.2 Clearance No.: FTDI# 171 Future Technology Devices International Ltd.
PAGE 2
Document No.: FT_000329 FT232BL/BQ USB UART IC Datasheet Version 2.2 Clearance No.
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Document No.: FT_000329 FT232BL/BQ USB UART IC Datasheet Version 2.2 Clearance No.: FTDI# 171 2 FT232B Block Diagram Figure 2.1 FT232B Block Diagram For a description of each function please refer to Section 4.
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Document No.: FT_000329 FT232BL/BQ USB UART IC Datasheet Version 2.2 Clearance No.: FTDI# 171 Table of Contents 1 Typical Applications ...................................................................... 2 1.1 Driver Support .................................................................................... 2 1.2 Part Numbers...................................................................................... 2 2 FT232B Block Diagram ...............................................................
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Document No.: FT_000329 FT232BL/BQ USB UART IC Datasheet Version 2.2 Clearance No.: FTDI# 171 Appendix C – Revision History ...................................................................
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Document No.: FT_000329 FT232BL/BQ USB UART IC Datasheet Version 2.2 Clearance No.: FTDI# 171 3 Device Pin Out and Signal Description 3.1 32 Pin LQFP Package Figure 3.1 QFN-32 Package Pin Out and schematic symbol The part number FT232BM version is also a LQFP-32 package. Please note that this datasheet is not for the FT232BM. Refer to FTDI website for the FT232BM datasheet.
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Document No.: FT_000329 FT232BL/BQ USB UART IC Datasheet Version 2.2 Clearance No.: FTDI# 171 3.2 32 Pin QFN Package Figure 3.
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Document No.: FT_000329 FT232BL/BQ USB UART IC Datasheet Version 2.2 Clearance No.: FTDI# 171 3.3 LQFP and QFN Package Pin Out Description Pin No. Name Type Description 7 USBDP I/O USB Data Signal Plus ( Requires 1.5k pull-up to 3V3OUT or RSTOUT# ) 8 USBDM I/O USB Data Signal Minus Table 3.1 USB Interface Group Pin No. Name Type Description 13 VCCIO PWR +3.0 volt to +5.25 volt VCC to the UART interface pins 10...12, 14...16 and 18...25. When interfacing with 3.
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Document No.: FT_000329 FT232BL/BQ USB UART IC Datasheet Version 2.2 Clearance No.: FTDI# 171 Pin No. Name Type Description 25 TXD Output 24 RXD Input 23 RTS# Output 22 CTS# Input 21 DTR# Output 20 DSR# Input Data Set Ready Control Input / Handshake Signal. 19 DCD# Input Data Carrier Detect Control Input. 18 RI# Input Ring Indicator Control Input.
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Document No.: FT_000329 FT232BL/BQ USB UART IC Datasheet Version 2.2 Clearance No.: FTDI# 171 4 Function Description The FT232B is a lead free version of the 2nd generation of FTDI’s USB to serial UART interface device which simplifies USB to serial designs.
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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.
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Document No.: FT_000329 FT232BL/BQ USB UART IC Datasheet Version 2.2 Clearance No.: FTDI# 171 4.2 Functional Block Descriptions The following paragraphs detail each function within the FT232B. Please refer to the block diagram shown in Figure 2.1 . The 3.3V LDO Regulator generates the 3.3 volt reference voltage for driving the USB transceiver cell output buffers. It requires an external decoupling capacitor to be attached to the 3V3OUT regulator output pin. It also provides 3.3V power to the RSTOUT# pin.
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Document No.: FT_000329 FT232BL/BQ USB UART IC Datasheet Version 2.2 Clearance No.: FTDI# 171 EEPROM interface. Though the FT232B will work without the optional EEPROM, an external 93C46 (93C56 or 93C66) EEPROM can be used to customise the USB VID, PID, Serial Number, Product Description Strings and Power Descriptor value of the FT232B for OEM applications. Other parameters controlled by the EEPROM include Remote Wake Up, Soft Pull Down on Power-Off and USB 2.0 descriptor modes.
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Document No.: FT_000329 FT232BL/BQ USB UART IC Datasheet Version 2.2 Clearance No.: FTDI# 171 5 Devices Characteristics and Ratings 5.1 Absolute Maximum Ratings The absolute maximum ratings for the FT232B devices are as follows. These are in accordance with the Absolute Maximum Rating System (IEC 60134). Exceeding these may cause permanent damage to the device.
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Document No.: FT_000329 FT232BL/BQ USB UART IC Datasheet Version 2.2 Clearance No.: FTDI# 171 5.2 DC Characteristics DC Characteristics (Ambient Temperature = 0˚C to 70˚C) Parameter Description Minimum Typical Maximum Units Conditions VCC1 VCC Operating Supply Voltage 4.35 5 5.25 V VCC2 VCCIO Operating Supply Voltage 3.0 --- 5.25 V Icc1 Operating Supply Current --- 25 --- mA Normal Operation Icc2 Operating Supply Current --- 180 200 μA USB Suspend **Note 3 Table 5.
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Document No.: FT_000329 FT232BL/BQ USB UART IC Datasheet Version 2.2 Clearance No.: FTDI# 171 Parameter Description Minimum Typical Maximum Units Conditions Voh Output Voltage High 4.0 - 5.0 V Fosch = 6MHZ Vol Output Voltage Low 0.1 - 1.0 V Fosch = 6MHZ Vin Input Switching Threshold 1.8 2.5 3.2 V Table 5.5 XTIN / XTOUT Pin Characteristics Parameter Description Minimum Typical Maximum Units Conditions Voh Output Voltage High 3.2 4.1 4.
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Document No.: FT_000329 FT232BL/BQ USB UART IC Datasheet Version 2.2 Clearance No.: FTDI# 171 6 USB Power Configurations The following sections illustrate possible USB power configurations for the FT232B. 6.1 USB Bus Powered Configuration Figure 6.1 Bus Powered Configuration Figure 6.1 illustrates a typical USB bus powered configuration. A USB Bus Powered device gets its power from the USB bus.
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Document No.: FT_000329 FT232BL/BQ USB UART IC Datasheet Version 2.2 Clearance No.: FTDI# 171 6.2 Self Powered Configuration Figure 6.2 Self Powered Configuration Figure 6.2 illustrates a typical USB self powered configuration. A USB Self Powered device gets its power from its own POWER SUPPLY and does not draw current from the USB bus.
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Document No.: FT_000329 FT232BL/BQ USB UART IC Datasheet Version 2.2 Clearance No.: FTDI# 171 6.3 Interfacing to 3.3V Logic 6.3.1 Bus Powered Circuit with 3.3V logic drive / supply voltage Figure 6.3 Bus Powered Circuit with 3.3V logic drive / supply voltage Figure 6.3 shows how to configure the FT232B to interface with a 3.3V logic device. In this example, a discrete 3.3V regulator is used to supply the 3.3V logic from the USB supply. VCCIO is connected to the output of the 3.
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Document No.: FT_000329 FT232BL/BQ USB UART IC Datasheet Version 2.2 Clearance No.: FTDI# 171 6.3.2 Self Powered Circuit with 3.3V logic drive / supply Figure 6.4 Self Powered Circuit with 3.3V logic drive / supply Figure 6.4 is an example of a USB self powered design with 3.3V interface. In this case VCCIO is supplied by an external 3.3V supply in order to make the device IO pins drive out at 3.3V logic level, thus allowing it to be connected to a 3.3V MCU or other external logic.
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Document No.: FT_000329 FT232BL/BQ USB UART IC Datasheet Version 2.2 Clearance No.: FTDI# 171 6.4 Bus Powered Circuit (<=100mA) with Power Control Figure 6.5 Bus Powered with Power Switching Configuration USB Bus powered circuits need to be able to power down in USB suspend mode in order to meet the <= 500uA total suspend current requirement (including external logic). This limit is 2.5mA for devices that support remote wake-up.
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Document No.: FT_000329 FT232BL/BQ USB UART IC Datasheet Version 2.2 Clearance No.: FTDI# 171 7 Device Configuration Examples The following sections illustrate device configurations for the FT245BM. 7.1 Oscillator Configurations Figure 7.1 3 Pin Ceramic Resonator Configuration Figure 7.2 Crystal or 2 Pin Ceramic Resonator Configuration Figure 7.1 illustrates how to use the FT232B with a 3-Pin Ceramic Resonator. A suitable part would be a ceramic resonator from Murata’s CERALOCK range or equivalent.
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Document No.: FT_000329 FT232BL/BQ USB UART IC Datasheet Version 2.2 Clearance No.: FTDI# 171 7.2 EEPROM Configuration Figure 7.3 EEPROM Configuration Figure 7.3 illustrates how to connect the FT232B to the 93C46 (93C56 or 93C66) EEPROM. EECS (pin 32) is directly connected to the chip select (CS) pin of the EEPROM. EESK (pin 1) is directly connected to the clock (SK) pin of the EEPROM. EEDATA (pin 2) is directly connected to the Data In (Din) pin of the EEPROM.
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Document No.: FT_000329 FT232BL/BQ USB UART IC Datasheet Version 2.2 Clearance No.: FTDI# 171 8 UART Interface Configurations The following sections illustrate possible UART configurations for the FT232B. 8.1 USB  RS232 Converter Configuration Figure 8.1 USB-RS232 Converter Configuration Figure 7.1 illustrates how to connect the UART interface of the FT232B to a TTL – RS232 Level Converter I.C. to make a USB  RS232 converter using the popular “213” series of TTL to RS232 level converters.
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Document No.: FT_000329 FT232BL/BQ USB UART IC Datasheet Version 2.2 Clearance No.: FTDI# 171 8.2 USB  RS422 Converter Configuration Figure 8.2 USB-RS422 Converter Configuration Figure 8.2 illustrates how to connect the UART interface of the FT232B to a TTL – RS422 Level Converter I.C. to make a USB  RS422 converter. There are many such level converter devices available – this example uses Exar/Sipex SP491 devices which have enables on both the transmitter and receiver.
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Document No.: FT_000329 FT232BL/BQ USB UART IC Datasheet Version 2.2 Clearance No.: FTDI# 171 8.3 USB  RS485 Converter Configuration Figure 8.3 USB-RS485 Converter Configuration Figure 7.3 illustrates how to connect the UART interface of the FT232B to a TTL – RS485 Level Converter I.C. to make a USB => RS485 converter. This example uses the Exar/Sipex SP481 device but there are similar parts available from Maxim and Analog Devices amongst others.
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Document No.: FT_000329 FT232BL/BQ USB UART IC Datasheet Version 2.2 Clearance No.: FTDI# 171 9 LED Interface Configuration Figure 9.1 Dual LED Configuration Configuration Figure 9.2 Single LED The FT232B has two IO pins dedicated to controlling LED status indicators, one for transmitted data the other for received data. When data is being transmitted / received the respective pins drive from tri-state to low in order to provide indication on the LEDs of data transfer.
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Document No.: FT_000329 FT232BL/BQ USB UART IC Datasheet Version 2.2 Clearance No.: FTDI# 171 10 Package Parameters 10.1 LQFP Package Dimension The FT232BL is supplied in a 32 pin LQFP package as standard. Figure 10.1 32 LQFP Package Dimensions This package has a 7mm x 7mm body (9mm x 9mm including leads) with leads on a 0.8mm pitch. The above drawing shows the LQFP-32 package – all dimensions are in millimeters.
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Document No.: FT_000329 FT232BL/BQ USB UART IC Datasheet Version 2.2 Clearance No.: FTDI# 171 10.2 QFN Package Dimension The FT232BQ is supplied in a 32 pin QFN package as standard. Figure 10.2 32 LQFP Package Dimensions The FT232BQ is supplied in lead (Pb) free, leadless QFN32 package. This package has a 5 mm x 5 mm body with no protruding pins, and is ideal for for projects where package area is critical. In the above drawing all dimensions are in millimetres.
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Document No.: FT_000329 FT232BL/BQ USB UART IC Datasheet Version 2.2 Clearance No.: FTDI# 171 11 Contact Information Head Office – Glasgow, UK Future Technology Devices International Limited Unit 1, 2 Seaward Place, Centurion Business Park Glasgow G41 1HH United Kingdom Tel: +44 (0) 141 429 2777 Fax: +44 (0) 141 429 2758 E-mail (Sales) E-mail (Support) E-mail (General Enquiries) Web Site URL Web Shop URL sales1@ftdichip.com support1@ftdichip.com admin1@ftdichip.com http://www.ftdichip.com http://www.
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Document No.: FT_000329 FT232BL/BQ USB UART IC Datasheet Version 2.2 Clearance No.: FTDI# 171 Appendix A – References Useful Application Notes AN-100, “Using the FT232/FT245R with External Crystal or Oscillator” http://www.ftdichip.com/Documents/AppNotes/AN_100_Using_The_FT232_245R_With_External_Osc(FT_ 000067).pdf AN_103, “FTDI Drivers Installation Guide for VISTA”. http://www.ftdichip.com/Documents/AppNotes/AN_103_FTDI_Drivers_Installation_Guide_for_VISTA(FT_ 000080).
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Document No.: FT_000329 FT232BL/BQ USB UART IC Datasheet Version 2.2 Clearance No.: FTDI# 171 Appendix B – List of Figures and Tables List of Figures Figure 2.1 FT232B Block Diagram .............................................................................................. 3 Figure 3.1 QFN-32 Package Pin Out and schematic symbol ....................................................... 6 Figure 3.2 QFN-32 Package Pin Out and schematic symbol .......................................................
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Document No.: FT_000329 FT232BL/BQ USB UART IC Datasheet Version 2.2 Clearance No.: FTDI# 171 Appendix C – Revision History Version 1.0 Version 1.1 Version 1.2 Initial document created Section 3.2 RESET# Pin description corrected (RESET# does not have an internal 200k pull-up to VCC as previously stated). Section 3.1, figure 2 pin-out corrected (EECS = Pin 32). Pin and package naming made consistent throughout data sheet. Section 1.1 Updated to reflect availability of Mac OS X driver. Section 4.
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Document No.: FT_000329 FT232BL/BQ USB UART IC Datasheet Version 2.2 Clearance No.: FTDI# 171 Version 2.0 Edited title, FT232BQ/BL photo, section in 3.1 and sction1.2 15th Sept 2010 Version 2.1 Edited Section 6, circuit diagrams, Figure 6.1 and 6.2. 19th Jan 2011 Corrected BQ reel quantity from 1,000 to 2,500 Version 2.2 Corrected Minimum Input Switching Threshold Voltage 07th Nov 2011 (table 5.