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PDF FT232BM Data sheet ( Hoja de datos )
| Número de pieza | FT232BM | |
| Descripción | Generation of FTDIs Popular USB UART I.C. | |
| Fabricantes | ETC | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de FT232BM (archivo pdf) en la parte inferior de esta página. Total 24 Páginas | ||
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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 it’s 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.
1.0 Features
HARDWARE FEATURES
• Single Chip USB óAsynchronous Serial Data
VIRTUAL COM PORT ( VCP ) DRIVERS for
Transfer
- Windows 98 and Windows 98 SE
• Full Handshaking & Modem Interface Signals
- Windows 2000 / ME / XP
• UART I/F Supports 7 / 8 Bit Data, 1 / 2 Stop Bits
- Windows CE **
and Odd/Even/Mark/Space/No Parity
- MAC OS-8 and OS-9
• Data rate 300 => 3M Baud ( TLL )
- MAC OS-X **
• Data rate 300 => 1M Baud ( RS232 )
- Linux 2.40 and greater
• Data rate 300 => 3M Baud ( RS422/RS485 )
D2XX ( USB Direct Drivers + DLL S/W Interface )
• 384 Byte Receive Buffer / 128 Byte Transmit Buffer - Windows 98 and Windows 98 SE
for high data throughput
- Windows 2000 / ME / XP
• Adjustable RX buffer timeout
APPLICATION AREAS
• Full hardware assisted hardware or X-On / X-Off - USB óRS232 Converters
handshaking
- USB ó RS422 / RS485 Converters
• In-built support for event characters and line break - Upgrading RS232 Legacy Peripherals to USB
condition
- Cellular and Cordless Phone USB data transfer
• Auto Transmit Buffer control for RS485
cables and interfaces
• Support for USB Suspend / Resume through
- Interfacing MCU based designs to USB
SLEEP# and RI# pins
- USB Audio and Low Bandwidth Video data transfer
• Support for high power USB Bus powered devices - PDA ó USB data transfer
through PWREN# pin
- USB Smart Card Readers
• Integrated level converter on UART and control
- Set Top Box ( S.T.B. ) PC - USB interface
signals for interfacing to 5v and 3.3v logic
- USB Hardware Modems
• Integrated 3.3v regulator for USB IO
- USB Wireless Modems
• Integrated Power-On-Reset circuit
- USB Instrumentation
• Integrated 6MHz – 48Mhz clock multiplier PLL
- USB Bar Code Readers
• USB Bulk or Isocronous data transfer modes
[ ** = In planning or under development ]
• 4.4v 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
DS232B Version 1.1 © Future Technology Devices Intl. Ltd. 2002
Page 1 of 24
1 page  
3.0 Block Diagram ( simplified )
FT232BM USB UART ( USB - Serial) I.C.
VCC
3V3OUT
PWRCTL
3.3 Volt
LDO
Regulator
SLEEP#
PWREN#
Dual Port TX
Buffer
128 bytes
48MHz
USBDP
USBDM
USB
Transceiver
Serial Interface
Engine
( SIE )
USB
Protocol Engine
UART
FIFO Controller
Baud Rate
Generator
UART
TXD
RXD
RTS#
CTS#
DTR#
DSR#
DCD#
RI#
TXDEN
USB DPLL
XTOUT
XTIN
6MHZ
Oscillator
x8 Clock
Multiplier
Dual Port RX
Buffer
384 Bytes
48MHz
12MHz RESET#
3V3OUT
RESET
GENERATOR
EEPROM
Interface
TXLED#
RXLED#
EECS
EESK
EEDATA
RSTOUT#
TEST
GND
3.1 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 it’s 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.
DS232B Version 1.1 © Future Technology Devices Intl. Ltd. 2002
Page 5 of 24
5 Page 
6.0 Absolute Maximum Ratings
FT232BM USB UART ( USB - Serial) I.C.
These are the absolute maximum ratings for the FT232BM device in accordance with the Absolute Maximum Rating System
(IEC 60134). Exceeding these may cause permanent damage to the device.
• Storage Temperature ……………………………………………………. –65oC to + 150oC
• Ambient Temperature ( Power Applied )……………………………….. 0oC to + 70oC
• VCC Supply Voltage ……………………………………………….…….. -0.5v to +6.00v
• DC Input Voltage - Inputs ……………………………………………….. -0.5v to VCC + 0.5v
• DC Input Voltage - High Impedance Bidirectionals …………………… -0.5v to VCC + 0.5v
• DC Output Current – Outputs …………………………………………… 24mA
• DC Output Current – Low Impedance Bidirectionals …………………. 24mA
• Power Dissipation ( VCC = 5.25v ) .……………………………………… 500mW
• Electrostatic Discharge Voltage ( I < 1uA ) ……………………………… +/- 2000v
• Latch Up Current ( Vi < 0 or Vi > Vcc ) ………………………………….. 100mA
6.1 D.C. Characteristics
DC Characteristics ( Ambient Temperature = 0 .. 70oC )
Operating Voltage and Current
Parameter Description
Min Typ Max Units Conditions
Vcc1
VCC Operating Supply Voltage
4.4 5.0 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 uA USB Suspend ** Note 1
Note 1 – Supply current excludes the 200uA nominal drawn by the external pull-up resistor on USB DP.
UART IO Pin Characteristics ( VCCIO = 5.0v )
Parameter Description
Min Typ Max Units Conditions
Voh Output Voltage High
4.4 - 4.9
V I source = 2mA
Vol Output Voltage Low
0.1 - 0.7
V I sink = 4 mA
Vin Input Switching Threshold
1.1 1.5 1.9
V Note 2
VHys
Input Switching Hysteresis
200 mV
UART IO Pin Characteristics ( VCCIO = 3.3v )
Parameter Description
Min Typ Max Units Conditions
Voh Output Voltage High
2.7 - 3.2
V I source = 2mA
Vol Output Voltage Low
0.1 - 0.7
V I sink = 4 mA
Vin Input Switching Threshold
1.0 1.4 1.8
V Note 2
VHys
Input Switching Hysteresis
200 mV
Note 2 – Inputs have an internal 200k pull-up resistor to VCCIO.
DS232B Version 1.1 © Future Technology Devices Intl. Ltd. 2002
Page 11 of 24
11 Page | ||
| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet FT232BM.PDF ] | |
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