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| 型号： | FT232BQ-REEL |
| 厂商： | FTDI, Future Technology Devices International Ltd |
| 文件页数： | 10/34页 |
| 文件大小： | 0K |
| 描述： | IC NEW DESIGNS REFER TO FT232RQ |
| 标准包装： | 1 |
| 系列： | USBmadeEZ-UART |
| 通道数： | 1，UART |
| FIFO's： | 256 字节 |
| 规程： | RS232，RS422，RS485 |
| 电源电压： | 4.35 V ~ 5.25 V |
| 带自动流量控制功能： | 是 |
| 带调制解调器控制功能： | 是 |
| 带CMOS： | 是 |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 32-WFQFN 裸露焊盘 |
| 供应商设备封装： | 32-QFN 裸露焊盘（5x5） |
| 包装： | 标准包装 |
| 其它名称： | 768-1067-6 |
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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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相关代理商/技术参数 |
参数描述 |
|---|---|
| FT232HL | 制造商:FTDI 制造商全称:FTDI 功能描述:FT232H Single Channel Hi-Speed USB to Multipurpose UART/FIFO IC |
| FT232HL-REEL | 功能描述:USB 接口集成电路 USB HS to UART/FIFO SPI/JTAG/I2C LQFP-48 RoHS:否 制造商:Cypress Semiconductor 产品:USB 2.0 数据速率: 接口类型:SPI 工作电源电压:3.15 V to 3.45 V 工作电源电流: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:WLCSP-20 |
| FT232HL-TRAY | 功能描述:USB 接口集成电路 USB HS to UART/FIFO SPI/JTAG/I2C LQFP-48 RoHS:否 制造商:Cypress Semiconductor 产品:USB 2.0 数据速率: 接口类型:SPI 工作电源电压:3.15 V to 3.45 V 工作电源电流: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:WLCSP-20 |
| FT232HQ-REEL | 功能描述:USB 接口集成电路 USB HS to UART/FIFO SPI/JTAG/I2C QFN-48 RoHS:否 制造商:Cypress Semiconductor 产品:USB 2.0 数据速率: 接口类型:SPI 工作电源电压:3.15 V to 3.45 V 工作电源电流: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:WLCSP-20 |
| FT232HQ-TRAY | 功能描述:USB 接口集成电路 USB HS to UART/FIFO SPI/JTAG/I2C QFN-48 RoHS:否 制造商:Cypress Semiconductor 产品:USB 2.0 数据速率: 接口类型:SPI 工作电源电压:3.15 V to 3.45 V 工作电源电流: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:WLCSP-20 |
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