參數(shù)資料
型號(hào)： FT232BM
廠商： Electronic Theatre Controls, Inc.
英文描述： Generation of FTDI’s Popular USB UART I.C.
中文描述： 在FTDI的流行的USB UART的新一代集成電路
文件頁(yè)數(shù)： 6/24頁(yè)
文件大小： 812K
代理商： FT232BM
DS232B Version 1.1 Future Technology Devices Intl. Ltd. 2002
Page 6 of 24
FT232BM USB UART ( USB - Serial) I.C.
x8 Clock Multiplier
The x8 Clock Multiplier takes the 6MHz input from the Oscillator cell and generates a 12MHz reference clock for
the SIE, USB Protocol Engine and UART FIFO controller blocks. It also generates a 48MHz reference clock for
the USB DPPL and the Baud Rate Generator blocks.
Serial Interface Engine ( SIE )
The Serial Interface Engine ( SIE ) block performs the Parallel to Serial and Serial to Parallel conversion of the
USB data. In accordance to the USB 1.1 specification, it performs bit stuffing / un-stuffing and CRC5 / CRC16
generation / checking on the USB data stream.
USB Protocol Engine
The USB Protocol Engine manages the data stream from the device USB control endpoint. It handles the
low level USB protocol ( Chapter 9 ) requests generated by the USB host controller and the commands for
controlling the functional parameters of the UART.
Dual Port TX Buffer ( 128 bytes )
Data from the USB data out endpoint is stored in the Dual Port TX buffer and removed from the buffer to the
UART transmit register under control of the UART FIFO controller.
Dual Port RX Buffer ( 384 bytes )
Data from the UART receive register is stored in the Dual Port RX buffer prior to being removed by the SIE on a
USB request for data from the device data in endpoint.
UART FIFO Controller
The UART FIFO controller handles the transfer of data between the Dual Port RX and TX buffers and the UART
transmit and receive registers.
UART
The UART performs asynchronous 7 / 8 bit Parallel to Serial and Serial to Parallel conversion of the data on
the RS232 ( RS422 and RS485 ) interface. Control signals supported by the UART include RTS, CTS, DSR ,
DTR, DCD and RI. The UART provides a transmitter enable control signal ( TXDEN ) to assist with interfacing
to RS485 transceivers. The UART supports RTS/CTS, DSR/DTR and X-On/X-Off handshaking options.
Handshaking, where required, is handled in hardware to ensure fast response times. The UART also supports
the RS232 BREAK setting and detection conditions.
Baud Rate Generator
The Baud Rate Generator provides a x16 clock input to the UART from the 48MHz reference clock and consists
of a 14 bit prescaler and 3 register bits which provide fine tuning of the baud rate ( used to divide by a number
plus a fraction ). This determines the Baud Rate of the UART which is programmable from 183 baud to 3 million
baud.
RESET Generator
The Reset Generator Cell provides a reliable power-on reset to the device internal circuitry on power up. An
additional RESET# input and RSTOUT# output are provided to allow other devices to reset the FT232BM or the
FT232BM to reset other devices respectively. During reset, RSTOUT# is high-impedance otherwise it drives
out at the 3.3v provided by the onboard regulator. RSTOUT# can be used to control the 1k5 pull-up on USB
DP directly where delayed USB enumeration is required. It can also be used to reset other devices. RSTOUT#
will stay high-impedance for approximately 5ms after VCC has risen above 3.5v AND the device oscillator is
running AND RESET# is high. RESET# should be tied to VCC unless it is a requirement to reset the device
from external logic or an external reset generator i.c.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
FT232BQ 制造商:FTDI 制造商全稱:FTDI 功能描述:USB UART ( USB - Serial) I.C.
FT232BQ-REEL 功能描述:USB 接口集成電路 USB to Serial UART IC QFN-32 RoHS:否 制造商:Cypress Semiconductor 產(chǎn)品:USB 2.0 數(shù)據(jù)速率: 接口類型:SPI 工作電源電壓:3.15 V to 3.45 V 工作電源電流: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WLCSP-20
FT232HL 制造商:FTDI 制造商全稱:FTDI 功能描述:FT232H Single Channel Hi-Speed USB to Multipurpose UART/FIFO IC
FT232HL-REEL 功能描述:USB 接口集成電路 USB HS to UART/FIFO SPI/JTAG/I2C LQFP-48 RoHS:否 制造商:Cypress Semiconductor 產(chǎn)品:USB 2.0 數(shù)據(jù)速率: 接口類型:SPI 工作電源電壓:3.15 V to 3.45 V 工作電源電流: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WLCSP-20
FT232HL-TRAY 功能描述:USB 接口集成電路 USB HS to UART/FIFO SPI/JTAG/I2C LQFP-48 RoHS:否 制造商:Cypress Semiconductor 產(chǎn)品:USB 2.0 數(shù)據(jù)速率: 接口類型:SPI 工作電源電壓:3.15 V to 3.45 V 工作電源電流: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WLCSP-20
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