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參數(shù)資料
| 型號： | 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 |
| 文件頁數(shù)： | 3/24頁 |
| 文件大?。?/td> | 812K |
| 代理商： | FT232BM |
DS232B Version 1.1 Future Technology Devices Intl. Ltd. 2002
Page 3 of 24
FT232BM USB UART ( USB - Serial) I.C.
Programmable Receive Buffer Timeout
In the previous device, the receive buffer timeout
used to flush remaining data from the receive
buffer was fixed at 16ms timeout. This timeout is
now programmable over USB in 1ms increments
from 1ms to 255ms, thus allowing the device to
be better optimised for protocols requiring faster
response times from short data packets.
TXDEN Timing fix
TXDEN timing has now been fixed to remove the
external delay that was previously required for
RS485 applications at high baud rates. TXDEN
now works correctly during a transmit send-break
condition.
Relaxed VCC Decoupling
The 2
nd
generation devices now incorporate a level
of on-chip VCC decoupling. Though this does
not eliminate the need for external decoupling
capacitors, it significantly improves the ease of pcb
design requirements to meet FCC,CE and other
EMI related specifications.
Improved PreScaler Granularity
The previous version of the Prescaler supported
division by ( n + 0 ), ( n + 0.125 ), ( n + 0.25 ) and
( n + 0.5 ) where n is an integer between 2 and
16,384 ( 2
14
). To this we have added ( n + 0.375
), ( n + 0.625 ), ( n + 0.75 ) and ( n+ 0.875 ) which
can be used to improve the accuracy of some baud
rates and generate new baud rates which were
previously impossible ( especially with higher baud
rates ).
Bit Bang Mode
The 2
nd
generation device has a new option
referred to as “Bit Bang” mode. In Bit Bang mode,
the eight UART interface control lines can be
switched between UART interface mode and an
8-bit Parallel IO port. Data packets can be sent
to the device and they will be sequentially sent to
the interface at a rate controlled by the prescaler
setting. As well as allowing the device to be used
stand-alone as a general purpose IO controller for
example controlling lights, relays and switches,
some other interesting 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 it’s hardware function, then after
the FPGA device is configured the FT232BM 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
who’s 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 3
rd
parties.
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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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