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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)： | 2/24頁 |
| 文件大小： | 812K |
| 代理商： | FT232BM |
DS232B Version 1.1 Future Technology Devices Intl. Ltd. 2002
Page 2 of 24
FT232BM USB UART ( USB - Serial) I.C.
2.0 Enhancements
This section summarises the enhancements of the 2
nd
generation device compared to it’s FT8U232AM predecessor.
For further details, consult the device pin-out description and functional descriptions.
Integrated Power-On-Reset ( POR ) Circuit
The device now incorporates an internal POR
function. The existing RESET# pin is maintained
in order to allow external logic to reset the device
where required, however for many applications
this pin can now be either left N/C or hard wired to
VCC. In addition, a new reset output pin ( RSTO#
) is provided in order to allow the new POR circuit
to provide a stable reset to external MCU and other
devices. RSTO# was the TEST pin on the previous
generation of devices.
Integrated RCCLK Circuit
In the previous devices, an external RC circuit
was required to ensure that the oscillator and
clock multiplier PLL frequency was stable prior
to enabling the clock internal to the device. This
circuit is now embedded on-chip – the pin assigned
to this function is now designated as the TEST pin
and should be tied to GND for normal operation.
and control signals
The previous devices would drive the UART and
control signals at 5v CMOS logic levels. The
new device has a separate VCC-IO pin allowing
the device to directly interface to 3.3v and other
logic families without the need for external level
converter i.c.’s
Integrated Level Converter on UART interface
Bus Powered, high current devices
The previous devices had a USBEN pin, which
became active when the device was enumerated
by USB. To provide power control, this signal had
to be externally gated with SLEEP# and RESET#.
This gating is now done on-chip - USBEN has
now been replaced with the new PWREN# signal
which can be used to directly drive a transistor or
P-Channel MOSFET in applications where power
switching of external circuitry is required. A new
EEPROM based option makes the device pull
gently down it’s UART interface lines when the
power is shut off ( PWREN# is High ). In this mode,
any residual voltage on external circuitry is bled to
GND when power is removed thus ensuring that
external circuitry controlled by PWREN# resets
reliably when power is restored.
Lower Suspend Current
Integration of RCCLK within the device and internal
design improvements reduce the suspend current
of the FT232BM to under 200uA ( excluding the
1.5k pull-up on USB DP ) in USB suspend mode.
This allows greater margin for peripherals to meet
the USB Suspend current limit of 500uA.
Support for USB Isocronous Transfers
Whilst USB Bulk transfer is usually the best
choice for data transfer, the scheduling time of the
data is not guaranteed. For applications where
scheduling latency takes priority over data integrity
such as transferring audio and low bandwidth
video data, the new device now offers an option
of USB Isocronous transfer via an option bit in the
EEPROM.
Improved Power Management control for USB
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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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