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參數(shù)資料
| 型號： | FT232BL-REEL |
| 廠商： | FTDI, Future Technology Devices International Ltd |
| 文件頁數(shù)： | 10/34頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC USB FS SERIAL UART 32-LQFP |
| 產(chǎn)品培訓(xùn)模塊： | USB Introduction |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 系列： | USBmadeEZ-UART |
| 通道數(shù)： | 1，UART |
| FIFO's： | 256 字節(jié) |
| 規(guī)程： | RS232，RS422，RS485 |
| 電源電壓： | 4.35V ~ 5.25V |
| 帶自動流量控制功能： | 是 |
| 帶調(diào)制解調(diào)器控制功能： | 是 |
| 帶CMOS： | 是 |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 32-LQFP |
| 供應(yīng)商設(shè)備封裝： | 32-LQFP |
| 包裝： | 標(biāo)準(zhǔn)包裝 |
| 產(chǎn)品目錄頁面： | 634 (CN2011-ZH PDF) |
| 其它名稱： | 768-1009-6 |
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Copyright 2011 Future Technology Devices International Limited
18
Document No.: FT_000329
FT232BL
/BQ USB UART IC Datasheet Version 2.2
Clearance No.: FTDI#
171
6.2 Self Powered Configuration
Figure 6.2 Self Powered Configuration
Figure 6.2 illustrates a typical USB self powered configuration. A USB Self Powered device gets its power
from its own POWER SUPPLY and does not draw current from the USB bus. The basic rules for USB Self
power devices are as follows:
a) A Self-Powered device should not force current down the USB bus when the USB Host or Hub
Controller is powered down.
b) A Self Powered Device can take as much current as it requires during normal operation and USB
suspend as it has its own POWER SUPPLY.
c) A Self Powered Device can be used with any USB Host and both Bus and Self Powered USB Hubs
PWRCTL (pin 14) is pulled high to configure the device with a USB Bus Power descriptor. The power
descriptor in the EEPROM should be programmed to a value of zero. The USB power descriptor option in
the EEPROM should be programmed to a value of zero (self powered).
To meet requirement, the 1.5 K pull-up resistors on USBDP is connected to RSTOUT# as per the bus-
power circuit. However, the USB Bus Power is used to control the RESET# Pin of the FT232B device.
When the USB Host or Hub is powered up RSTOUT# will pull the 1.5K resistor on USBDP to 3.3V, thus
identifying the device as a full speed device to USB. When the USB Host or Hub power is off, RESET# will
go low and the device will be held in reset. As RESET# is low, RSTOUT# will also be low, so no current
will be forced down USBDP via the 1.5K pull-up resistor when the host or hub is powered down. Failure to
do this may cause some USB host or hub controllers to power up erratically.
Note: When the FT232B is in reset, the UART interface pins all go tri-state. These pins have internal 200K
pull-up resistors to VCCIO, so they will gently pull high unless driven by some external logic.
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相關(guān)代理商/技術(shù)參數(shù) |
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| FT232BL-TRAY | 制造商:Future Technology Devices International (FTDI Chip) 功能描述:USB-to-UART 1-CH 128Byte FIFO 5V 32-Pin LQFP Tray |
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| 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 |
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