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参数资料
| 型号： | FT2232D-REEL |
| 厂商： | FTDI, Future Technology Devices International Ltd |
| 文件页数： | 18/61页 |
| 文件大小： | 0K |
| 描述： | IC USB FS DUAL UART/FIFO 48-LQFP |
| 产品培训模块： | USB Introduction |
| 标准包装： | 1 |
| 系列： | USBmadeEZ-FIFO，FT-X，X-Chip |
| 特点： | USB 至 UART 和（或）FIFO、SPI、I2C、JTAG |
| 通道数： | 2，DUART |
| FIFO's： | 384 字节 |
| 规程： | RS232，RS422，RS485 |
| 电源电压： | 4.35 V ~ 5.25 V |
| 带并行端口： | 是 |
| 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： | 48-LQFP |
| 供应商设备封装： | 48-LQFP |
| 包装： | 标准包装 |
| 产品目录页面： | 634 (CN2011-ZH PDF) |
| 配用： | 768-1030-ND - MOD USB HS FT2232H EVAL 813-1009-ND - MODULE USB-TO-FPGA TOOL W/MANUAL 813-1001-ND - MODULE USB ADAPTR FOR FT2232D LP 813-1000-ND - MODULE USB ADAPTER FOR FT2232D |
| 其它名称： | 768-1010-6 |
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Copyright 2010 Future Technology Devices International Limited
25
Document No.: FT_000173
FT2232D DUAL USB TO SERIAL UART
/FIFO IC Datasheet
Version 2.05
Clearance No.: FTDI# 127
6.3 Power Switching Configuration
Figure 6.5 Bus Powered Circuit with Power Control
USB Bus powered circuits need to be able to power down in USB suspend mode in order to meet
the <= 500μA total suspend current requirement (including external logic). Some external logic can
power itself down into a low current state by monitoring the PWREN# pin. For external logic that
cannot power itself down in that way, the FT2232D provides a simple but effective way of turning
off power to external circuitry during USB suspend.
Figure 6.5 shows how to use a discrete P-Channel Logic Level MOSFET to control the power to
external logic circuits. A suitable device would be an International Rectifier (www.irf.com)
IRLML6402, or equivalent. It is recommended that a “soft start” circuit consisting of a 1K series
resistor and a 0.1 μF capacitor are used to limit the current surge when the MOSFET turns on.
Without the soft start circuit there is a danger that the transient power surge of the MOSFET turning
on will reset the FT2232D, or the USB host / hub controller. The values used here allow attached
circuitry to power up with a slew rate of ~12.5 V per millisecond, in other words the output voltage
will transition from GND to 5V in approximately 400 microseconds.
Alternatively, a dedicated power switches I.C. with inbuilt “soft-start” can be used instead of a
MOSFET. A suitable power switch I.C. for such an application would be a Micrel (www.micrel.com)
MIC2025-2BM or equivalent. Please note the following points in connection with power controlled
designs: –
a)The logic to be controlled must have its own reset circuitry so that it will automatically reset
itself when power is re-applied on coming out of suspend.
b)Set the Pull-down on Suspend option in the FT2232Ds EEPROM.
c)For USB high-power bus powered device (one that consumes greater than 100 mA, and up to
500 mA of current from the USB bus), the power consumption of the device should be set in the
max power field in the EEPROM. A high-power bus powered device must use this descriptor in the
EEPROM to inform the system of its power requirements.
d)For 3.3V power controlled circuits the VCCIO pins must not be powered down with the external
circuitry. Either connect the power switch between the output of the 3.3V regulator and the
external 3.3V logic, or if appropriate power the VCCIO pin from the 3V3OUT pin of the FT2232D.
相关PDF资料 |
PDF描述 |
|---|---|
| FT2232HQ-REEL | IC USB HS DUAL UART/FIFO 64-QFN |
| FT232BL-REEL | IC USB FS SERIAL UART 32-LQFP |
| FT232HL-REEL | IC HS USB TO UART/FIFO 48LQFP |
| FT232RL-REEL | IC USB FS SERIAL UART 28-SSOP |
| FT245BL-REEL | IC USB FS PARALLEL FIFO 32-LQFP |
相关代理商/技术参数 |
参数描述 |
|---|---|
| FT2232D-TRAY | 制造商:Future Technology Devices International (FTDI Chip) 功能描述:DUAL USB TO SERIAL UART/FIFO IC |
| FT2232H | 制造商:FTDI 制造商全称:FTDI 功能描述:DUAL HIGH SPEED USB TO MULTIPURPOSE UART |
| FT2232H MINI MODULE | 功能描述:界面开发工具 USB Hi-Speed FT2232H Evaluation Module RoHS:否 制造商:Bourns 产品:Evaluation Boards 类型:RS-485 工具用于评估:ADM3485E 接口类型:RS-485 工作电源电压:3.3 V |
| FT2232H_10 | 制造商:FTDI 制造商全称:FTDI 功能描述:DUAL HIGH SPEED USB TO MULTIPURPOSE UART/FIFO IC |
| FT2232H_12 | 制造商:FTDI 制造商全称:FTDI 功能描述:Dual High Speed USB to Multipurpose UART/FIFO IC |
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