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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)： | 4/24頁 |
| 文件大?。?/td> | 812K |
| 代理商： | FT232BM |
DS232B Version 1.1 Future Technology Devices Intl. Ltd. 2002
Page 4 of 24
FT232BM USB UART ( USB - Serial) I.C.
PreScaler Divide By 1 Fix
The previous device had a problem when the
integer part of the divisor was set to 1. In the 2
nd
generation device setting the prescaler value to 1
gives a baud rate of 2 million baud and setting it
to zero gives a baud rate of 3 million baud. Non-
integer division is not supported with divisor values
of 0 and 1.
Less External Support Components
As well as eliminating the RCCLK RC network, and
for most applications the need for an external reset
circuit, we have also eliminated the requirement for
a 100k pull-up on EECS to select 6MHz operation.
When the FT232BM is being used without the
configuration EEPROM, EECS, EESK and
EEDATA can now be left n/c. For circuits requiring
a long reset time ( where the device is reset
externally using a reset generator i.c., or reset is
controlled by the IO port of a MCU, FPGA or ASIC
device ) an external transistor circuit is no longer
required as the 1k5 pull-up resistor on USB DP can
be wired to the RESETO# pin instead of to 3.3v.
Note : RESETO# drives out at 3.3v level, not at 5v
VCC level. This is the preferred configuration for
new designs. In some other configurations, RSTO#
can be used to reset external logic / MCU circuitry.
Extended EEROM Support
The previous generation of devices only supported
EEPROM of type 93C46 ( 128 x 16 bit ). The new
devices will also work with EEPROM type 93C56
( 256 x 16 bit ) and 93C66 ( 512 x 16 bit ). The
extra space is not used by the device, however it
is available for use by other external MCU / logic
whilst the FT232BM is being held in reset.
USB 2.0 ( full speed option )
A new EEPROM based option allows the FT232BM
to return a USB 2.0 device descriptor as opposed
to USB 1.1. Note : The device would be a USB 2.0
Full Speed device ( 12Mb/s ) as opposed to a USB
2.0 High Speed device ( 480Mb/s ).
Multiple Device Support without EEPROM
When no EEPROM ( or a blank or invalid
EEPROM ) is attached to the device, the FT232BM
no longer gives a serial number as part of it’s
USB descriptor. This allows multiple devices to
be simultaneously connected to the same PC.
However, we still highly recommend that EEPROM
is used, as without serial numbers a device can
only be identified by which hub port in the USB tree
it is connected to which can change if the end user
re-plugs the device into a different port.
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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 安裝風格:SMD/SMT 封裝 / 箱體:WLCSP-20 |
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