参数资料
型号: FT2232D-REEL
厂商: FTDI, Future Technology Devices International Ltd
文件页数: 14/61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:
带自动流量控制功能:
带调制解调器控制功能:
带CMOS:
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
Copyright 2010 Future Technology Devices International Limited
21
Document No.: FT_000173
FT2232D DUAL USB TO SERIAL UART
/FIFO IC Datasheet
Version 2.05
Clearance No.: FTDI# 127
6 USB Power Configurations
The following sections illustrate possible USB power configurations for the FT2232D.
6.0 USB Bus Powered Configuration
Figure 6.1 Bus Powered Configuration
Figure 6.1 illustrates the FT2232D in a typical USB bus powered configuration. A USB Bus
Powered device gets its power from the USB bus. Basic rules for USB Bus power devices are as
follows:-
a) On plug-in, the device must draw no more than 100mA
b) On USB Suspend the device must draw no more than 500μA.
c) A High Power USB Bus Powered Device (one that draws more than 100mA) should use the
PWREN# pin to keep the current below 100mA on plug-in and 500μA on USB suspend.
d) A device that consumes more than 100mA cannot be plugged into a USB Bus Powered Hub
e) No device can draw more that 500mA from the USB Bus.
The power descriptor in the EEPROM should be programmed to match the current draw required by the
device. A Ferrite Bead is connected in series with USB power to prevent noise from the device and
associated circuitry (EMI) being radiated down the USB cable to the Host. The value of the Ferrite Bead
depends on the total current required by the circuit - a suitable range of Ferrite Beads is available from
Steward (www.steward.com) for example Steward Part # MI0805K400R-00 also available from DigiKey,
Part # 240-1035-1.
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