FT232BL Integrated Circuit Chip USB UART ( USB - Serial) I.C.

FT232BM USB UART ( USB - Serial) I.C.

The FT232BM is the 2nd generation of FTDI’s popular USB UART I.C. This device not only adds extra functionality to its FT8U232AM predecessor and reduces external component count, but also maintains a high degree of pin compatibility with the original, making it easy to upgrade or cost reduce existing designs as well as increasing the potential for using the device in new application areas.

Features

HARDWARE FEATURES

• Single Chip USB ←→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

• 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

• USB Bulk or Isochronous data transfer modes

• 4.35V to 5.25V single supply operation

• 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

• Compact 32-LD LQFP package

VIRTUAL COM PORT (VCP) DRIVERS for

- Windows 98 and Windows 98 SE

- Windows 2000 / ME / Server 2003 / XP

- Windows XP 64 Bit

- Windows XP Embedded

- Windows CE 4.2

- MAC OS-8 and OS-9

- MAC OS-X

- Linux 2.40 and greater

D2XX (USB Direct Drivers + DLL S/W Interface)

- Windows 98 and Windows 98 SE

- Windows 2000 / ME / Server 2003 / XP

- Windows XP 64 Bit

- Windows XP Embedded

- Windows CE 4.2

- Linux 2.40 and greater

APPLICATION AREAS

- USB ←→RS232 Converters

- USB ←→ RS422 / RS485 Converters

- Upgrading RS232 Legacy Peripherals to USB

- Cellular and Cordless Phone USB data transfer cables and interfaces

- Interfacing MCU based designs to USB

- USB Audio and Low Bandwidth Video data transfer

- PDA ←→ USB data transfer

- USB Smart Card Readers

- Set Top Box (S.T.B.) PC - USB interface

- USB Hardware Modems

- USB Wireless Modems

- USB Instrumentation

- USB Bar Code Readers

Block Diagram (Simplified)

Functional Block Descriptions

• 3.3V LDO Regulator

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. The main function of this block is to power the USB Transceiver and the Reset Generator Cells rather than to power external logic. However, external circuitry requiring 3.3V nominal at a current of not greater than 5mA could also draw its power from the 3V3OUT pin if required.

• USB Transceiver

The USB Transceiver Cell provides the USB 1.1 / USB 2.0 full-speed physical interface to the USB cable. The output drivers provide 3.3 volt level slew rate control signalling, whilst a differential receiver and two single ended receivers provide USB data in, SEO and USB Reset condition detection.

• USB DPLL

The USB DPLL cell locks on to the incoming NRZI USB data and provides separate recovered clock and data signals to the SIE block.

• 6MHz Oscillator

The 6MHz Oscillator cell generates a 6MHz reference clock input to the x8 Clock multiplier from an external 6MHz crystal or ceramic resonator.